chore(repo): open dummy pull request

* test(app): consolidate Playwright journeys

* test(app): stabilize consolidated Playwright flows

* test(app): make streaming dependencies explicit

* test(app): await profile feature persistence

* test(app): sample only actual workspace tabs

.github/workflows/ci.yml

@@ -348,12 +348,12 @@ jobs:
         timeout-minutes: 10
         run: npx playwright install chromium
 
-      - name: Build app dependencies
-        run: npm run build:app-deps
-
       - name: Build server stack
         run: npm run build:server
 
+      - name: Build native app dependency
+        run: npm run build --workspace=@getpaseo/expo-two-way-audio
+
       - name: Install agent CLIs for provider tests
         run: node scripts/npm-retry.mjs install -g @anthropic-ai/claude-code @openai/codex@0.105.0 opencode-ai
 

CHANGELOG.md

@@ -1,5 +1,25 @@
 # Changelog
 
+## 0.6.0 - 2026-08-25
+
+### Changed
+
+- Restored the dedicated Explorer sidebar with Files and Changes by default, replacing the empty user-directed Side panel introduced in 0.5.0 ([#3826](https://github.com/getpaseo/paseo/pull/3826))
+- Changed content opened to the side to use an ordinary closable workspace pane instead of the Explorer sidebar ([#3826](https://github.com/getpaseo/paseo/pull/3826))
+- Restored the resizable combined Explorer dock on tablets ([#3826](https://github.com/getpaseo/paseo/pull/3826))
+
+### Added
+
+- Added per-action settings for opening files, changes, subagents, and pull requests in the main panel or on the side ([#3826](https://github.com/getpaseo/paseo/pull/3826))
+- Added New tab and drag support for compatible files, diffs, agents, terminals, pull requests, and plugin panels in Explorer ([#3826](https://github.com/getpaseo/paseo/pull/3826))
+- Added standalone Diff tabs while keeping an optional persisted inline-diff mode in Changes ([#3826](https://github.com/getpaseo/paseo/pull/3826))
+- Added custom Windows and Linux window controls ([#3826](https://github.com/getpaseo/paseo/pull/3826))
+
+### Fixed
+
+- Fixed OpenCode turns failing when the first event-stream connection stalls during startup ([#3814](https://github.com/getpaseo/paseo/pull/3814))
+- Fixed OpenCode prompts starting before the provider reports a ready connection ([#3821](https://github.com/getpaseo/paseo/pull/3821))
+
 ## 0.5.2 - 2026-08-24
 
 ### Fixed

CLAUDE.md

@@ -52,7 +52,7 @@ At the start of non-trivial work, list `docs/` and skim anything relevant to the
 | [docs/qa.md](docs/qa.md)                                           | QA evidence bar for pull requests — platform matrix, version drift, performance, UI proof                                      |
 | [docs/mobile-testing.md](docs/mobile-testing.md)                   | Maestro and mobile test workflows                                                                                              |
 | [docs/mobile-panels.md](docs/mobile-panels.md)                     | Compact left/center/right panel ownership, worklet motion, gesture revisions, and Fabric constraints                           |
-| [docs/side-panel.md](docs/side-panel.md)                           | The Side panel surface — its three renderings, tab placement intents, pane lifecycle, and the routing preference               |
+| [docs/explorer-sidebar.md](docs/explorer-sidebar.md)               | Explorer sidebar and ordinary side-pane host contracts, lifecycle, placement, and routing preferences                          |
 | [docs/ad-hoc-daemon-testing.md](docs/ad-hoc-daemon-testing.md)     | Isolated in-process daemon test harness                                                                                        |
 | [docs/browser-capture-harness.md](docs/browser-capture-harness.md) | Real-Electron browser screenshot harness and compositor-surface gotcha                                                         |
 | [docs/android.md](docs/android.md)                                 | App variants, local/cloud builds, EAS workflows                                                                                |

docs/design.md

@@ -62,6 +62,10 @@ The button is `<Button>` (`packages/app/src/components/ui/button.tsx`). It has f
 
 `ghost` is structural and non-committal — no border, no fill. Back arrows, header toggles, "Load more" footers (`packages/app/src/screens/sessions-screen.tsx:54-63`), more-affordances. Ghost is used when the affordance is part of the chrome, not a decision.
 
+Header and toolbar controls use `interactionHighlight` for hovered, pressed, open, and selected
+backgrounds. It is a translucent semantic fill so the same control works over the main surface and
+the sidebar. Apply it as `backgroundColor`; setting `opacity` on the control also fades its content.
+
 `destructive` is filled with `destructive`. It only appears inside a confirm. The button on the page is `outline`; the destructive button is the confirm button inside the dialog.
 
 Sizes: `xs` for ultra-tight inline triggers. `sm` for any button sitting in a row. `md` is the page default. `lg` is reserved for large standalone CTAs.
@@ -155,6 +159,8 @@ On a narrow desktop route, app navigation yields to the rendered content topolog
 
 Electron window controls are top-corner obstructions, not a compact-layout condition. Rendered surfaces declare which top corners they physically occupy; only those corners receive clearance. Full-window overlays redeclare both corners. A focused split pane owns both corners; if focus restoration temporarily exposes the full split tree, the split boundary reserves one top strip instead of assigning a control rectangle to an arbitrarily narrow leaf. The 720px desktop breakpoint preserves the default 320px sidebar and target 400px center width when the Explorer is closed; it is product policy, not an obstruction gate.
 
+Windows and Linux controls are fixed window chrome, outside scrolling header content. A tab rail that reaches them ends at their obstruction and shows the shared overflow fade. On macOS, the Explorer toggle occupies a fixed top-right window slot so opening and closing Explorer does not move the pointer target.
+
 A new list+detail feature copies the settings shell. A new workspace-shaped feature copies the workspace shell. Inventing a third shape happens in design review, not in a PR.
 
 ---

docs/development.md

@@ -242,13 +242,13 @@ focused invalidation capture; React Native's generated stacks make that mode hig
 Set `PASEO_PROFILE_TRACE_FOCUS=1` to include focus targets, durations, and JavaScript call stacks in
 the scenario report. This mode wraps `HTMLElement.focus`, so use it only for diagnosis.
 
-For the desktop Side panel toggle, run the app against the root checkout's daemon and use:
+For the desktop Explorer sidebar toggle, run the app against the root checkout's daemon and use:
 
 ```bash
 npm run profile:explorer-toggle --workspace=@getpaseo/app
 ```
 
-The harness verifies port `6768`, opens the Paseo workspace, creates and warms the Side panel pane,
+The harness verifies port `6768`, opens the Paseo workspace, creates and warms the Explorer pane,
 records an idle control, then measures settled and 50 ms burst Cmd+E toggles. It reports
 input-to-DOM and input-to-paint latency, React commits, mounts, unmounts, and DOM mutations. Set
 `PASEO_PROFILE_TRACE_PATH=/tmp/explorer-toggle.trace.json` or
@@ -278,6 +278,17 @@ That report includes input and composer height changes plus React work grouped i
 stream, and ancestor/root scopes. Ancestor/root timings include descendant work because the Profiler
 boundaries are nested. A printable key after an empty newline should not change either height.
 
+### Preview Windows and Linux window controls on macOS
+
+Desktop development can replace native macOS traffic lights with Paseo's custom controls:
+
+```bash
+PASEO_DESKTOP_WINDOW_CONTROLS=windows npm run dev:desktop
+PASEO_DESKTOP_WINDOW_CONTROLS=linux npm run dev:desktop
+```
+
+The override is rejected in packaged builds. Restart the desktop process when changing it.
+
 ### Desktop macOS compositor watchdog
 
 macOS display sleep can leave Chromium's GPU-process display link — the vsync

docs/explorer-sidebar.md

@@ -0,0 +1,74 @@
+# Explorer sidebar and side pane
+
+The Explorer sidebar and the side pane share panel implementations, but they have different shell
+contracts.
+
+| Surface          | Purpose                      | Lifecycle                                  |
+| ---------------- | ---------------------------- | ------------------------------------------ |
+| Explorer sidebar | Files and Changes navigation | Cmd+E shows or hides the dedicated dock    |
+| Side pane        | Ordinary workspace content   | Created and closed like any workspace pane |
+
+## Panel host contract
+
+Every desktop panel registers its supported `PaneHost` values and presentation. Launchers derive
+fixed-target labels and icons from that registration, filter by host, and never substitute one
+panel type for another. Tab moves reject unsupported destinations, and placement resolves only to
+a compatible pane.
+
+Files and Changes are the Explorer defaults and its singleton navigation views. Other compatible
+tabs, including agents, terminals, files, and diffs, can move between Explorer and main panes.
+Keep panel implementations independent of either shell. `WorkspacePanelHost` owns mounting and
+retention, while each shell owns its tabs, focus, dragging, resizing, and shortcuts.
+
+## Explorer sidebar
+
+`packages/app/src/workspace-tabs/explorer-sidebar.ts` owns show, hide, toggle, and view selection.
+On desktop, the shell is rendered outside the workspace split canvas so it divides the full
+workspace, including the header. It has its own persisted width and resize handle. Main-pane splits
+never read or modify that width.
+
+The persisted layout still contains the Explorer pane so tabs survive reloads. The renderer removes
+that pane from the workspace split tree and docks it separately. Persisted identifiers retain the
+literal `"explorer"` pane id and `explorerPaneIdByWorkspace` key for compatibility.
+
+The tab rail has no inline add or close controls. Its context menu opens a New Tab launcher and
+toggles the singleton Files and Changes views. Individual tab menus close instances or move
+compatible tabs to main. Explorer tabs can be reordered, but the dock cannot be split. Selecting
+an Explorer tab does not change workspace focus.
+
+Cmd+E selects Changes for Git workspaces and Files otherwise. Compact layouts use the combined
+full-screen Explorer overlay and close it after a file opens. Wide native layouts without pane
+splits use the same combined content in a resizable inline dock; opening a file leaves that dock
+visible. Both presentations keep their selection in the panel store and reuse the layout store's
+per-workspace Explorer width. They do not create a second Explorer lifecycle.
+
+## Side pane
+
+`packages/app/src/workspace-tabs/open-beside.ts` owns content opened beside the user's work. The
+layout store remembers one ordinary pane per workspace. The first side open creates a full-height
+right split around the workspace root; later side opens reuse it.
+
+Closing the pane or moving away its final tab removes it normally and clears the remembered id. A
+later side open creates a new pane. There is no hidden side-pane lifecycle.
+
+Placement intent still controls existing tabs:
+
+| Mode      | New target                  | Existing target                   |
+| --------- | --------------------------- | --------------------------------- |
+| `pane`    | opens in the requested pane | moves to the requested pane       |
+| `prefer`  | opens in the requested pane | stays where the user placed it    |
+| `focused` | opens in the focused pane   | focuses it where it already lives |
+| `ambient` | opens in a compatible pane  | focuses it where it already lives |
+
+Explicit **Open to Side** uses `pane`. Implicit opens use `prefer`, so a preference affects only a
+new target and never yanks an existing tab out of a user-selected pane.
+
+## Routing preferences
+
+Desktop **Settings → Layout → Open in side pane** has independent switches for Explorer Files,
+Explorer Changes, chat files, diff files, subagents, pull requests, and Changes links. All switches
+default off. Mobile ignores them.
+
+Panels request an implicit open through the narrow `openPreferredTarget(target, source)` pane
+contract. Entry points outside panels use `openPreferredWorkspaceTarget`. Do not branch on a
+specific shell inside a panel.

docs/glossary.md

@@ -19,7 +19,8 @@ Authoritative terminology. UI label wins. Don't invent synonyms; use what's here
 - **MR** — GitLab merge request. UI label for GitLab change requests only; do not use MR for GitHub/Gitea/Forgejo.
 - **Worktree** — Paseo-managed git worktree (`~/.paseo/worktrees/{name}`); also a `workspaceKind` value. User-facing creation treats it as the `worktree` workspace isolation choice. Code and `paseo.json` retain worktree terminology for git lifecycle implementation. Forbidden: "Checkout" as a product synonym.
 - **Repository / Remote** — Internal Git observations. They may produce mutable kind, branch, and project-grouping metadata but never the host-local project ID, root, display name, or workspace membership. No UI label.
-- **Side panel** — The companion surface beside the user's work, holding Changes, Files, the pull request, and tabs an agent opens alongside its output. UI: "Side panel". Code: `packages/app/src/workspace-tabs/side-panel.ts`; the persisted pane id and layout key keep the pre-rename `explorer` spelling. See [side-panel.md](side-panel.md). Forbidden: "Explorer" as the name of the surface — **File Explorer** is only the Files view inside it.
+- **Explorer sidebar** — The dedicated navigation dock containing the Files and Changes trees. UI: "Explorer sidebar". Code: `packages/app/src/workspace-tabs/explorer-sidebar.ts`; persisted pane identifiers retain the `explorer` spelling. See [explorer-sidebar.md](explorer-sidebar.md).
+- **Side pane** — An ordinary right-side workspace pane used for content opened beside the user's work. It closes and participates in workspace splits like every other main-host pane. See [explorer-sidebar.md](explorer-sidebar.md#side-pane). Forbidden: "Side panel".
 - **Directory-backed surface** — A right-sidebar surface whose content is determined by the workspace's `cwd`, so two workspaces on the same directory see identical content: git diff/status, forge change-request info, file preview/explorer contents. Keyed by `(serverId, cwd)`, never `workspaceId`. See [architecture.md](architecture.md#right-sidebar-boundary-directory-backed-vs-workspace-owned).
 - **Workspace-owned state** — Per-workspace state that never leaks to a same-`cwd` sibling: tabs, agents, terminals, panes, title, plus review drafts, diff-mode overrides, composer attachments, and file-explorer open/expand state. Keyed by `workspaceId` (`cwd` only as a fallback for old payloads). See [architecture.md](architecture.md#right-sidebar-boundary-directory-backed-vs-workspace-owned).
 - **Workspace status bucket** — Aggregate activity signal for a workspace row. Same-`cwd` workspaces intentionally share agent and terminal status buckets, while tab, agent, and terminal visibility remains scoped by `workspaceId`.

docs/plugins.md

@@ -165,6 +165,10 @@ RPC. Snapshot DTOs are deeply readonly and frozen at runtime so plugin code cann
 app state or a memoized selection. Panels use one persisted
 `plugin` workspace-tab target, so reload, disable, removal, and restoration resolve through the
 current installed-plugin catalog. A missing contribution renders unavailable inside the tab.
+Panels declare `locations: ["workspace", "explorer"]` to opt into Explorer hosting; omission means
+workspace only. Location controls hosting, not context. An agent panel target keeps its `agentId`
+when moved between hosts. Explorer configuration can create workspace-context panels and remove
+existing agent-context instances, but it cannot create an agent panel without an agent-aware command.
 
 Command Center callbacks use the selected host's existing `PaseoApi` for normal Paseo operations.
 They use typed plugin RPC only for plugin-specific backend work. Navigation is limited to the

docs/side-panel.md

@@ -1,98 +0,0 @@
-# Side panel
-
-The companion surface beside the user's work: Changes, Files, the pull request, and
-anything an agent asks to show alongside its output.
-
-Everything that opens, reveals, hides, or asks about it goes through
-`packages/app/src/workspace-tabs/side-panel.ts`. Nothing else branches on which
-surface the current layout uses.
-
-## Three renderings, two facts
-
-| Layout                 | Rendering                                       |
-| ---------------------- | ----------------------------------------------- |
-| compact                | slide-over overlay, owned by the panel store    |
-| non-compact + splits   | dedicated right pane, owned by the layout store |
-| non-compact, no splits | ordinary tabs in the focused pane               |
-
-The third case is the one that bites. A native tablet renders one pane at a time and
-the tab row only lists the focused pane's tabs, so anything routed into a separate
-side panel pane there disappears with no way back.
-
-## Placement
-
-Where a tab lands is an intent the caller declares, not something the store infers
-from a `paneId` that happens to be in scope. `WorkspaceTabPlacement`
-(`packages/app/src/stores/workspace-layout-actions.ts`) has four modes, and the
-difference between them only shows up when the tab is already open somewhere:
-
-| Mode      | New tab           | Tab already open             |
-| --------- | ----------------- | ---------------------------- |
-| `pane`    | opens in the pane | **moves** to the pane        |
-| `prefer`  | opens in the pane | stays where the user left it |
-| `focused` | focused pane      | focuses it in place          |
-| `ambient` | focused pane      | focuses it in place          |
-
-`pane` is a pane-local affordance — that pane's `+` menu, its empty-state launcher.
-The user is placing the tab and expects it to arrive.
-
-`prefer` is an implicit supporting open — an agent's file link or a failed workspace
-setup. It has an opinion about new tabs only. Yanking a tab out of the pane the user
-deliberately moved it to is the failure this mode exists to prevent.
-
-`ambient` differs from `focused` in one rule: reconciliation opens tabs with nobody
-behind the click, and the side panel can hold focus from an earlier reveal, so an
-ambient open of something the user works _in_ (an agent, a terminal, a browser) is
-pushed out of the side panel. A `focused` open honours the focused pane whatever it
-is, because the user is standing in it.
-
-Deduplication lives in `openTabInLayoutFocused`, so it obeys the placement intent for
-every caller. Do not re-place a tab after opening it.
-
-## Lifecycle
-
-The side panel lives in the ordinary split tree, so it is a pane like any other until
-it empties or the user dismisses it:
-
-- **Close pane** on the side panel **hides** it; its tabs are waiting on the next reveal.
-- **Close pane** on any other pane **removes** it.
-- Closing the Side panel's final tab hides the pane. Revealing it returns the empty launcher.
-  This is close-only: claiming or dragging that tab to another pane leaves the empty Side panel
-  visible.
-- Nothing takes the last visible pane away. `closePane` will not remove it, and
-  neither `closePane` nor `hideSidePanel` will hide it — including the header toggle
-  reaching `hideSidePanel` after every other pane is gone. The gate is one check in
-  `setPaneHiddenInLayout`; do not add a second one upstream.
-
-`closePane` in the layout store owns that distinction. React renders the button and
-does not decide what it means.
-
-Dragging a pane's last tab into another pane collapses the source pane — except the
-side panel, which the user summons and expects to find again, split size and all.
-
-## What the side panel never does
-
-It does not seed itself. Revealing it opens an empty pane with the launcher; the user
-picks what goes in. Detecting a pull request makes the launcher's card available and
-opens nothing. A failed workspace setup adds a background tab to the main pane.
-Running and successful setup never seed tabs.
-
-## Routing preference
-
-**Settings → General → Open supporting tabs in the Side panel**, on by default,
-persisted in client app settings as `openSupportingTabsInSidePanel`. Off means new
-supporting tabs land in the focused pane instead. Mobile ignores it. Explicit actions
-— the header toggle, a pane's `+` menu, the empty-state launcher — are never subject
-to it. The Changes keyboard shortcut and the diff-stat pill above an agent composer are
-supporting opens: they follow the preference and focus an existing Changes tab wherever
-the user left it. When Changes is already visible in the Side panel, the diff-stat pill
-hides the panel without closing the tab. A different visible Side panel tab switches to
-Changes instead.
-
-## The name
-
-The product surface is the **Side panel**. **File Explorer** is still the name of the
-Files view inside it. Persisted identifiers keep their pre-rename spelling: the pane
-id is the literal string `"explorer"` (`SIDE_PANEL_PANE_ID`) and the persisted layout
-key is `explorerPaneIdByWorkspace`. The persisted state schema is strict, so renaming
-either would fail every saved blob and wipe the layout it describes.

docs/testing.md

@@ -186,9 +186,13 @@ Test suites in this repo are heavy. Running them in bulk freezes the machine, es
 - For full-suite confidence, push to CI and check GitHub Actions.
 - Never run the full Playwright E2E suite locally — defer whole-suite verification to CI. Targeted Playwright specs are allowed when you changed or need to prove that specific flow.
 - App Playwright shares one warmed Metro server per run and gives every Playwright worker its own isolated daemon and `PASEO_HOME`. Spec files run concurrently without exposing one file's projects, agents, terminals, history, or provider configuration to another worker; tests within a file remain together so file-level setup is not repeated.
+- Playwright specs that exercise only the daemon import `daemonTest` from the shared fixtures so they do not create a browser context or page.
 - Helpers that create projects or workspaces own those records until cleanup. Their clients remove the daemon project on close, and an automatic fixture fails any test that still leaks a project record. Deleting only the temporary directory is not cleanup. Agent helpers pass the intended `workspaceId` through to agent creation; they never infer ownership from `cwd`.
 - Tests whose subject is daemon-global state, such as an empty history or daemon restart, start a dedicated host explicitly. Filenames and directories describe product behavior, never execution order or isolation mechanics.
 - Global setup accepts Metro as ready only when `/status` returns `packager-status:running`, then fetches the document's scripts so the cold bundle compilation finishes before Playwright's per-test timeout starts. A generic TCP listener is not sufficient readiness evidence. The browser suite uses direct local daemon connections and does not start a relay.
+- The app Playwright harness boots on Windows as well as POSIX. Spawn Node entrypoints through `process.execPath`, not `npx` or `node_modules/.bin` shims: Node refuses to spawn `.cmd` or `.bat` without `shell: true`, and shell mode concatenates argv without escaping and sends kill signals to `cmd.exe` instead of the real child.
+- Teardown kills the process tree, because a Windows signal reaches only the direct child and leaves forked workers holding the listening port.
+- The `asdf`-backed local Elixir relay stays POSIX-only, so the `relay-deployment` Playwright project is unavailable on Windows.
 
 ## Pull-request test routing
 

nix/npm-deps.hash

@@ -1 +1 @@
-sha256-o8d/nX0FdM6QB7c/RWpo1USsz8UNmwohSqkS7tflayc=
+sha256-gZ6egDKIDiDi9jmDlPamM+or2Tthwr17DbJ+P66t4RE=

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "paseo",
-  "version": "0.5.2",
+  "version": "0.6.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "paseo",
-      "version": "0.5.2",
+      "version": "0.6.0",
       "hasInstallScript": true,
       "license": "AGPL-3.0-or-later",
       "workspaces": [
@@ -36140,7 +36140,7 @@
     },
     "packages/app": {
       "name": "@getpaseo/app",
-      "version": "0.5.2",
+      "version": "0.6.0",
       "dependencies": {
         "@codemirror/commands": "6.10.4",
         "@codemirror/language": "6.12.4",
@@ -37192,12 +37192,12 @@
     },
     "packages/cli": {
       "name": "@getpaseo/cli",
-      "version": "0.5.2",
+      "version": "0.6.0",
       "dependencies": {
         "@clack/prompts": "^1.0.0",
-        "@getpaseo/client": "0.5.2",
+        "@getpaseo/client": "0.6.0",
-        "@getpaseo/protocol": "0.5.2",
+        "@getpaseo/protocol": "0.6.0",
-        "@getpaseo/server": "0.5.2",
+        "@getpaseo/server": "0.6.0",
         "chalk": "^5.3.0",
         "commander": "^12.0.0",
         "mime-types": "^2.1.35",
@@ -37444,10 +37444,10 @@
     },
     "packages/client": {
       "name": "@getpaseo/client",
-      "version": "0.5.2",
+      "version": "0.6.0",
       "dependencies": {
-        "@getpaseo/protocol": "0.5.2",
+        "@getpaseo/protocol": "0.6.0",
-        "@getpaseo/relay": "0.5.2",
+        "@getpaseo/relay": "0.6.0",
         "zod": "^4.4.3"
       },
       "devDependencies": {
@@ -37458,7 +37458,7 @@
     },
     "packages/desktop": {
       "name": "@getpaseo/desktop",
-      "version": "0.5.2",
+      "version": "0.6.0",
       "license": "AGPL-3.0-or-later",
       "dependencies": {
         "@getpaseo/cli": "*",
@@ -37701,7 +37701,7 @@
     },
     "packages/expo-two-way-audio": {
       "name": "@getpaseo/expo-two-way-audio",
-      "version": "0.5.2",
+      "version": "0.6.0",
       "license": "MIT",
       "devDependencies": {
         "@types/jest": "^29.5.14",
@@ -38597,7 +38597,7 @@
     },
     "packages/highlight": {
       "name": "@getpaseo/highlight",
-      "version": "0.5.2",
+      "version": "0.6.0",
       "dependencies": {
         "@codemirror/language": "6.12.4",
         "@codemirror/legacy-modes": "^6.5.3",
@@ -38626,12 +38626,12 @@
     },
     "packages/plugin": {
       "name": "@getpaseo/plugin",
-      "version": "0.5.2",
+      "version": "0.6.0",
       "dependencies": {
         "use-sync-external-store": "^1.6.0"
       },
       "devDependencies": {
-        "@getpaseo/client": "0.5.2",
+        "@getpaseo/client": "0.6.0",
         "@types/node": "^20.9.0",
         "@types/react": "~19.2.0",
         "react": "19.1.0",
@@ -38640,14 +38640,14 @@
         "zod": "^4.4.3"
       },
       "peerDependencies": {
-        "@getpaseo/client": "0.5.2",
+        "@getpaseo/client": "0.6.0",
         "react": "19.1.0",
         "zod": "^4.4.3"
       }
     },
     "packages/protocol": {
       "name": "@getpaseo/protocol",
-      "version": "0.5.2",
+      "version": "0.6.0",
       "dependencies": {
         "zod": "^4.4.3"
       },
@@ -38660,7 +38660,7 @@
     },
     "packages/relay": {
       "name": "@getpaseo/relay",
-      "version": "0.5.2",
+      "version": "0.6.0",
       "dependencies": {
         "base64-js": "^1.5.1",
         "tweetnacl": "^1.0.3",
@@ -38878,17 +38878,17 @@
     },
     "packages/server": {
       "name": "@getpaseo/server",
-      "version": "0.5.2",
+      "version": "0.6.0",
       "dependencies": {
         "@agentclientprotocol/sdk": "^0.17.1",
         "@anthropic-ai/claude-agent-sdk": "0.3.220",
         "@anthropic-ai/sdk": "^0.104.2",
         "@babel/parser": "^7.29.8",
-        "@getpaseo/client": "0.5.2",
+        "@getpaseo/client": "0.6.0",
-        "@getpaseo/highlight": "0.5.2",
+        "@getpaseo/highlight": "0.6.0",
-        "@getpaseo/plugin": "0.5.2",
+        "@getpaseo/plugin": "0.6.0",
-        "@getpaseo/protocol": "0.5.2",
+        "@getpaseo/protocol": "0.6.0",
-        "@getpaseo/relay": "0.5.2",
+        "@getpaseo/relay": "0.6.0",
         "@isaacs/ttlcache": "^2.1.4",
         "@modelcontextprotocol/sdk": "1.29.0",
         "@opencode-ai/sdk": "1.14.46",
@@ -39940,7 +39940,7 @@
     },
     "packages/website": {
       "name": "@getpaseo/website",
-      "version": "0.5.2",
+      "version": "0.6.0",
       "dependencies": {
         "@cloudflare/vite-plugin": "^1.29.1",
         "@cloudflare/workers-types": "^4.20260317.1",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "paseo",
-  "version": "0.5.2",
+  "version": "0.6.0",
   "private": true,
   "description": "Paseo: voice-controlled development environment for local AI coding agents",
   "keywords": [

packages/app/e2e/browser/add-project-flow.spec.ts

@@ -66,54 +66,21 @@ async function expectProjectHasNoWorkspaces(projectId: string): Promise<void> {
 test.describe("Add Project command-center flow", () => {
   test.describe.configure({ timeout: 180_000 });
 
-  test("method selection has no search field", async ({ page }) => {
+  test("method selection shows the daemon's available project sources without search", async ({
+    page,
+  }) => {
     await gotoAppShell(page);
 
     await openAddProjectFlow(page);
 
     await expect(addProjectFlowMethod(page, "directory-search")).toBeVisible();
+    await expect(addProjectFlowMethod(page, "github")).toContainText("Clone from GitHub");
+    await expect(addProjectFlowMethod(page, "new-directory")).toContainText("New directory");
     await expect(addProjectFlowInput(page)).toHaveCount(0);
     await expect(addProjectFlow(page).getByRole("textbox")).toHaveCount(0);
     await expect(page.getByTestId("add-project-flow-page-host")).toHaveCount(0);
   });
 
-  test("the back arrow, search input, and result glyph share one left edge", async ({ page }) => {
-    await gotoAppShell(page);
-    await openAddProjectFlow(page);
-
-    await page.keyboard.press("Enter");
-    await expectAddProjectPage(page, "directory-search");
-    await addProjectFlowInput(page).fill("/tmp");
-
-    const backGlyph = addProjectFlowBack(page).locator("svg");
-    const resultGlyph = addProjectFlow(page)
-      .locator('[data-testid^="add-project-flow-path-"]')
-      .first()
-      .locator("svg");
-    await expect(resultGlyph).toBeVisible();
-
-    const [backBox, inputBox, resultBox, titleBox, resultsBox, footerBox] = await Promise.all([
-      backGlyph.boundingBox(),
-      addProjectFlowInput(page).boundingBox(),
-      resultGlyph.boundingBox(),
-      page.getByTestId("add-project-flow-title").boundingBox(),
-      page.getByTestId("add-project-flow-results").boundingBox(),
-      page.getByTestId("add-project-flow-footer").boundingBox(),
-    ]);
-    expect(backBox).not.toBeNull();
-    expect(inputBox).not.toBeNull();
-    expect(resultBox).not.toBeNull();
-    expect(titleBox).not.toBeNull();
-    expect(resultsBox).not.toBeNull();
-    expect(footerBox).not.toBeNull();
-    if (!backBox || !inputBox || !resultBox || !titleBox || !resultsBox || !footerBox) return;
-
-    expect(Math.abs(backBox.x - inputBox.x)).toBeLessThanOrEqual(2);
-    expect(Math.abs(resultBox.x - inputBox.x)).toBeLessThanOrEqual(2);
-    expect(titleBox.height).toBeLessThanOrEqual(24);
-    expect(resultsBox.y + resultsBox.height).toBeLessThanOrEqual(footerBox.y + 1);
-  });
-
   test("an offline extra host neither appears nor forces host selection", async ({ page }) => {
     await gotoAppShell(page);
     await addOfflineHostAndReload(page, {
@@ -273,14 +240,6 @@ test.describe("Add Project command-center flow", () => {
     await expectProjectHasNoWorkspaces(projectId);
   });
 
-  test("the current daemon advertises Clone from GitHub and New directory", async ({ page }) => {
-    await gotoAppShell(page);
-    await openAddProjectFlow(page);
-
-    await expect(addProjectFlowMethod(page, "github")).toContainText("Clone from GitHub");
-    await expect(addProjectFlowMethod(page, "new-directory")).toContainText("New directory");
-  });
-
   test("a complete repository URL remains selectable without a GitHub search result", async ({
     page,
   }) => {

packages/app/e2e/browser/agent-consecutive-turns.spec.ts

@@ -442,21 +442,40 @@ function formatFrames(frames: TurnFrame[], centers: number | number[]): string {
     .join("\n");
 }
 
+function submittedRowContentTop(frame: TurnFrame | undefined): number | undefined {
+  const viewportTop = frame?.userRow.rect?.top;
+  const scrollTop = frame?.scroll.scrollTop;
+  return viewportTop == null || scrollTop == null ? undefined : viewportTop + scrollTop;
+}
+
 function expectRowContinuity(frames: TurnFrame[]): void {
   const first = frames.findIndex((frame) => hasPaintedLayout(frame.userRow));
-  const baseline = frames[first]?.userRow.rect?.top;
+  const baselineFrame = frames[first];
+  const baselineContentTop = submittedRowContentTop(baselineFrame);
   const disappeared = frames.findIndex(
     (frame, index) => index > first && !hasPaintedLayout(frame.userRow),
   );
   const reappeared = frames.findIndex(
     (frame, index) => index > disappeared && disappeared >= 0 && hasPaintedLayout(frame.userRow),
   );
-  const shifted = frames.findIndex(
+  const contentShifted = frames.findIndex((frame, index) => {
-    (frame, index) =>
+    const contentTop = submittedRowContentTop(frame);
+    return (
       index > first &&
       hasPaintedLayout(frame.userRow) &&
-      baseline !== undefined &&
+      baselineContentTop !== undefined &&
-      Math.abs((frame.userRow.rect?.top ?? baseline) - baseline) > 1,
+      contentTop !== undefined &&
+      Math.abs(contentTop - baselineContentTop) > 1
+    );
+  });
+  const viewportChanged = frames.findIndex(
+    (frame, index) =>
+      index > first &&
+      [
+        geometryChanged(frame.scroll.rect?.top, baselineFrame?.scroll.rect?.top),
+        geometryChanged(frame.scroll.rect?.height, baselineFrame?.scroll.rect?.height),
+        geometryChanged(frame.scroll.clientHeight, baselineFrame?.scroll.clientHeight),
+      ].some(Boolean),
   );
   const attachmentMissing = frames.findIndex(
     (frame, index) => index >= first && !hasPaintedLayout(frame.attachment),
@@ -468,16 +487,18 @@ function expectRowContinuity(frames: TurnFrame[]): void {
           `submitted row disappeared for ${Math.max(0, reappeared - disappeared)} recorded frames (${Math.max(0, (frames[reappeared]?.at ?? frames.at(-1)?.at ?? 0) - frames[disappeared].at).toFixed(1)}ms) before authoritative recovery`,
         ]
       : []),
-    ...(shifted >= 0
+    ...(contentShifted >= 0
       ? [
-          `submitted row moved from ${baseline?.toFixed(1)} to ${frames[shifted].userRow.rect?.top.toFixed(1)}`,
+          `submitted row moved in scroll content from ${baselineContentTop?.toFixed(1)} to ${submittedRowContentTop(frames[contentShifted])?.toFixed(1)}`,
         ]
       : []),
+    ...(viewportChanged >= 0 ? ["scroll viewport geometry changed"] : []),
     ...(attachmentMissing >= 0 ? ["submitted image attachment left the painted layout"] : []),
   ];
   let failure = Math.max(0, first);
   if (attachmentMissing >= 0) failure = attachmentMissing;
-  if (shifted >= 0) failure = shifted;
+  if (viewportChanged >= 0) failure = viewportChanged;
+  if (contentShifted >= 0) failure = contentShifted;
   if (disappeared >= 0) failure = disappeared;
   expect(
     violations,

packages/app/e2e/browser/agent-message-rewind.spec.ts

@@ -1,30 +1,9 @@
 import type { Locator } from "@playwright/test";
 import { expect, test, type Page } from "../support/fixtures";
 import { expectAgentIdle, expectAgentReadyToInterrupt } from "../support/helpers/agent-stream";
-import {
+import { cancelAgent, expectComposerVisible, submitMessage } from "../support/helpers/composer";
-  cancelAgent,
-  expectComposerDraft,
-  expectComposerVisible,
-  submitMessage,
-} from "../support/helpers/composer";
 import { openAgentRoute, seedMockAgentWorkspace } from "../support/helpers/mock-agent";
 
-async function completeSubmittedTurn(
-  page: Page,
-  agent: Awaited<ReturnType<typeof seedMockAgentWorkspace>>,
-  prompt: string,
-): Promise<Locator> {
-  await submitMessage(page, prompt);
-  const userMessage = page.getByTestId("user-message").filter({ hasText: prompt });
-  await expect(userMessage).toBeVisible();
-
-  const finish = await agent.client.waitForFinish(agent.agentId, 30_000);
-  expect(finish.status).toBe("idle");
-  await expect(page.getByText("(end of synthetic stream)", { exact: true })).toBeVisible();
-  await expect(userMessage).toHaveAttribute("aria-busy", "false");
-  return userMessage;
-}
-
 async function rewindConversation(page: Page, userMessage: Locator, prompt: string): Promise<void> {
   await userMessage.getByText(prompt, { exact: true }).hover();
   await userMessage.getByRole("button", { name: "Rewind to this message", exact: true }).click();
@@ -42,29 +21,6 @@ async function expectTurnCompletesNormally(
 }
 
 test.describe("Agent message rewind", () => {
-  test("rewinds a submitted prompt and restores it to the composer", async ({ page }) => {
-    test.setTimeout(90_000);
-    const prompt = "Restore this submitted prompt after rewind.";
-    const agent = await seedMockAgentWorkspace({
-      repoPrefix: "message-rewind-roundtrip-",
-      title: "Message rewind roundtrip",
-      model: "ten-second-stream",
-    });
-
-    try {
-      await openAgentRoute(page, agent);
-      await expectComposerVisible(page);
-      const userMessage = await completeSubmittedTurn(page, agent, prompt);
-
-      await rewindConversation(page, userMessage, prompt);
-
-      await expect(page.getByText("(end of synthetic stream)", { exact: true })).toHaveCount(0);
-      await expectComposerDraft(page, prompt);
-    } finally {
-      await agent.cleanup();
-    }
-  });
-
   test("keeps a pre-acknowledgement turn running after rewind is rejected", async ({ page }) => {
     test.setTimeout(90_000);
     const prompt = "Delay synthetic user message by 2000ms.";

packages/app/e2e/browser/agent-profile-modeless-preferences.spec.ts

@@ -103,6 +103,18 @@ async function readProviderModePreference(page: Page, provider: string): Promise
   );
 }
 
+async function readProviderFeaturePreferences(page: Page, provider: string): Promise<unknown> {
+  return page.evaluate(
+    ({ preferencesKey, providerId }) => {
+      const raw = localStorage.getItem(preferencesKey);
+      if (!raw) return null;
+      const preferences = JSON.parse(raw) as FormPreferences;
+      return preferences.providerPreferences?.[providerId]?.featureValues ?? null;
+    },
+    { preferencesKey: CREATE_AGENT_PREFERENCES_KEY, providerId: provider },
+  );
+}
+
 test.describe("Agent profiles repair modeless provider preferences", () => {
   test.describe.configure({ timeout: 240_000 });
 
@@ -207,6 +219,9 @@ test.describe("Agent profiles repair modeless provider preferences", () => {
 
       await openModelPicker(page);
       await applyProfileFromPicker(page, "Fast profile");
+      await expect
+        .poll(() => readProviderFeaturePreferences(page, featureProviderId), { timeout: 10_000 })
+        .toEqual({ fast_mode: true });
       await submitNewWorkspacePrompt(page, "Create an agent with profile features.");
 
       const createAgentRequest = await createAgentRecorder.waitForRequest();

packages/app/e2e/browser/bottom-sheet-reopen.spec.ts

@@ -10,6 +10,7 @@ async function openMockAgentAtMobileBreakpoint(page: Page) {
     repoPrefix: "bottom-sheet-reopen-",
     title: "Bottom sheet reopen e2e",
     initialPrompt: "Prepare a bottom sheet reopen test agent.",
+    model: "ten-second-stream",
   });
   await openAgentRoute(page, session);
   await expect(page.getByTestId("workspace-tab-switcher-trigger")).toBeVisible({
@@ -22,16 +23,6 @@ async function openMockAgentAtMobileBreakpoint(page: Page) {
   return session;
 }
 
-async function withMobileMockAgent(page: Page, run: () => Promise<void>) {
-  const session = await openMockAgentAtMobileBreakpoint(page);
-
-  try {
-    await run();
-  } finally {
-    await session.cleanup();
-  }
-}
-
 function bottomSheetBackdrop(page: Page) {
   return page.getByRole("button", { name: "Bottom sheet backdrop" }).first();
 }
@@ -108,35 +99,36 @@ async function openAndCloseModelSelectorTwice(page: Page) {
 }
 
 test.describe("mobile bottom sheet reopen", () => {
-  test("tab switcher can open, close, reopen, and close again", async ({ page }) => {
+  test("sheets reopen and model search returns to configuration", async ({ page }) => {
-    await withMobileMockAgent(page, async () => {
+    const session = await openMockAgentAtMobileBreakpoint(page);
-      await openAndCloseTabSwitcherTwice(page);
+    try {
-    });
+      await test.step("tab switcher opens, closes, and reopens", async () => {
-  });
+        await openAndCloseTabSwitcherTwice(page);
-
-  test("model selector can open, close, reopen, and close again", async ({ page }) => {
-    await withMobileMockAgent(page, async () => {
-      await openAndCloseModelSelectorTwice(page);
-    });
-  });
-
-  test("search selection returns to configuration options", async ({ page }) => {
-    await withMobileMockAgent(page, async () => {
-      await openModelSelector(page);
-      const sheet = page.getByTestId("agent-controls-model-sheet");
-
-      await page.getByTestId("model-search-all-input").click();
-      const model = page.getByRole("button", { name: /^Ten second stream/ });
-      await expect(model).toBeVisible({
-        timeout: 10_000,
       });
 
-      await model.click();
+      await test.step("model selector opens, closes, and reopens", async () => {
+        await openAndCloseModelSelectorTwice(page);
+      });
 
-      await expect(sheet).toBeVisible();
+      await test.step("model search returns to configuration", async () => {
-      await expect(page.getByTestId("agent-controls-settings-list")).toBeVisible();
+        await openModelSelector(page);
-      await expect(page.getByTestId("agent-controls-model")).toContainText("Ten second stream");
+        const sheet = page.getByTestId("agent-controls-model-sheet");
-      await expect(page.getByTestId("agent-controls-model-browser-sheet")).not.toBeVisible();
+
-    });
+        await page.getByTestId("model-search-all-input").click();
+        const model = page.getByRole("button", { name: /^Ten second stream/ });
+        await expect(model).toBeVisible({
+          timeout: 10_000,
+        });
+
+        await model.click();
+
+        await expect(sheet).toBeVisible();
+        await expect(page.getByTestId("agent-controls-settings-list")).toBeVisible();
+        await expect(page.getByTestId("agent-controls-model")).toContainText("Ten second stream");
+        await expect(page.getByTestId("agent-controls-model-browser-sheet")).not.toBeVisible();
+      });
+    } finally {
+      await session.cleanup();
+    }
   });
 });

packages/app/e2e/browser/branch-switcher.spec.ts

@@ -46,38 +46,6 @@ test.describe("Branch switcher", () => {
   // releases stale sessions from the previous spec; one retry stabilizes it.
   test.describe.configure({ retries: 1 });
 
-  test("switches the workspace branch from the git diff panel for an opaque workspace id", async ({
-    page,
-  }) => {
-    test.setTimeout(90_000);
-    const serverId = getServerId();
-    const workspace = await seedWorkspace({
-      repoPrefix: "branch-switch-",
-      repo: { branches: ["main", "dev"] },
-    });
-
-    try {
-      await gotoAppShell(page);
-      await waitForSidebarHydration(page);
-      await switchWorkspaceViaSidebar({ page, serverId, workspaceId: workspace.workspaceId });
-
-      await openChangesPanel(page);
-      await expectWorkspaceBranch(page, "main");
-      await switchBranchFromChangesPanel(page, { from: "main", to: "dev" });
-      await expectWorkspaceBranch(page, "dev");
-
-      await expect
-        .poll(
-          async () =>
-            (await readWorktreeBranchInfo({ worktreePath: workspace.repoPath })).currentBranch,
-          { timeout: 30_000 },
-        )
-        .toBe("dev");
-    } finally {
-      await workspace.cleanup();
-    }
-  });
-
   test("a custom workspace title stays in the header while the diff panel switches the real branch", async ({
     page,
   }) => {

packages/app/e2e/browser/changes-pane.spec.ts

@@ -30,11 +30,7 @@ const cleanupTasks: CleanupTask[] = [];
 const APP_SETTINGS_KEY = "@paseo:app-settings";
 
 function changesTree(page: Page) {
-  return page.getByTestId("changes-tree-rail-tree");
+  return page.getByTestId("changes-file-tree").filter({ visible: true });
-}
-
-function changesContent(page: Page) {
-  return page.getByTestId("changes-tree-rail-content");
 }
 
 async function readFileIfPresent(filePath: string): Promise<string | null> {
@@ -264,7 +260,8 @@ test("Changes opens the populated committed comparison for a clean checkout", as
   await openWorkspaceChangesSurface(page, workspace);
 
   const panel = page.getByTestId("working-diff-panel").filter({ visible: true });
-  await expect(panel.getByTestId("changes-diff-status-trigger")).toContainText("Committed");
+  const tree = page.getByTestId("changes-tree-panel").filter({ visible: true });
+  await expect(tree.getByTestId("changes-diff-status-trigger")).toContainText("Committed");
   await expect(panel.getByText("committed-only.ts", { exact: true })).toBeVisible();
 });
 
@@ -272,19 +269,19 @@ test("Changes expires a manual comparison when checkout dirtiness changes", asyn
   const workspace = await createWorkspaceWithMountedTabDiff();
   await openWorkspaceChanges(page, workspace);
 
-  const panel = page.getByTestId("working-diff-panel").filter({ visible: true });
+  const tree = page.getByTestId("changes-tree-panel").filter({ visible: true });
-  const mode = panel.getByTestId("changes-diff-status-trigger");
+  const mode = tree.getByTestId("changes-diff-status-trigger");
   await expect(mode).toContainText("Uncommitted");
 
   await mode.click();
   await page.getByTestId("changes-diff-mode-committed").click();
   await expect(mode).toContainText("Committed");
-  await expect(panel.getByRole("button", { name: "See uncommitted changes" })).toBeVisible();
+  await expect(tree.getByRole("button", { name: "See uncommitted changes" })).toBeVisible();
 
   execFileSync("git", ["add", "--all"], { cwd: workspace.repoPath });
   execFileSync("git", ["commit", "-m", "Commit working changes"], { cwd: workspace.repoPath });
   await expect(mode).toContainText("Committed");
-  await expect(panel.getByRole("button", { name: "See uncommitted changes" })).toHaveCount(0, {
+  await expect(tree.getByRole("button", { name: "See uncommitted changes" })).toHaveCount(0, {
     timeout: 30_000,
   });
 
@@ -297,7 +294,8 @@ test("an empty Changes comparison links to the populated comparison", async ({ p
   await openWorkspaceChangesSurface(page, workspace);
 
   const panel = page.getByTestId("working-diff-panel").filter({ visible: true });
-  const mode = panel.getByTestId("changes-diff-status-trigger");
+  const tree = page.getByTestId("changes-tree-panel").filter({ visible: true });
+  const mode = tree.getByTestId("changes-diff-status-trigger");
   await mode.click();
   await page.getByTestId("changes-diff-mode-committed").click();
   await expect(panel.getByText("committed-only.ts", { exact: true })).toBeVisible();
@@ -305,8 +303,8 @@ test("an empty Changes comparison links to the populated comparison", async ({ p
   await mode.click();
   await page.getByTestId("changes-diff-mode-uncommitted").click();
 
-  await expect(panel.getByText("No uncommitted changes", { exact: true })).toBeVisible();
+  await expect(tree.getByText("No uncommitted changes", { exact: true })).toBeVisible();
-  const seeCommitted = panel.getByRole("button", { name: "See committed changes" });
+  const seeCommitted = tree.getByRole("button", { name: "See committed changes" });
   await expect(seeCommitted).toBeVisible();
   await seeCommitted.click();
   await expect(mode).toContainText("Committed");
@@ -321,7 +319,7 @@ test("changes file actions open below the right-click without a reserved kebab",
   await openWorkspaceChanges(page, workspace);
 
   await expect(page.getByTestId("diff-file-1")).toContainText("zz-deleted.ts");
-  const deletedFileName = page.getByText("zz-deleted.ts", { exact: true });
+  const deletedFileName = page.getByTestId("diff-file-1-name");
   await expect(deletedFileName).toHaveCSS("user-select", "none");
   await deletedFileName.dblclick();
   expect(await page.evaluate(() => window.getSelection()?.toString() ?? "")).toBe("");
@@ -432,7 +430,6 @@ test("changes context menus duplicate files and folders", async ({ page }) => {
     .poll(() => readFileIfPresent(path.join(workspace.repoPath, "src/use-mounted-tab-set copy.ts")))
     .toBe(AFTER);
 
-  await page.getByTestId("changes-toggle-tree").click();
   await changesTree(page).getByTestId("diff-folder-src-toggle").click({ button: "right" });
   await page.getByTestId("diff-folder-src-duplicate").click();
   await expect
@@ -447,8 +444,6 @@ test("changes tree aligns every file status after its diff stat", async ({ page
   });
   await useUnwrappedDiffLines(page);
   await openWorkspaceChanges(page, workspace);
-  await page.getByTestId("changes-toggle-tree").click();
-
   const tree = changesTree(page);
   const modifiedRow = tree.getByTestId("diff-tree-file-0");
   const deletedRow = tree.getByTestId("diff-tree-file-1");
@@ -471,7 +466,6 @@ test("changes context menu recursively collapses descendant folders", async ({ p
   await useUnwrappedDiffLines(page);
   await openWorkspaceChanges(page, workspace);
 
-  await page.getByTestId("changes-toggle-tree").click();
   const tree = changesTree(page);
   await expect(tree.getByTestId("diff-folder-src/zz-folder")).toBeVisible();
   await expect(tree.getByTestId("diff-folder-src/zz-folder/nested")).toBeVisible();
@@ -516,7 +510,6 @@ test("changes context menus expose folder revert and restore a file after confir
   await useUnwrappedDiffLines(page);
   await openWorkspaceChanges(page, workspace);
 
-  await page.getByTestId("changes-toggle-tree").click();
   const tree = changesTree(page);
   await tree.getByTestId("diff-folder-src-toggle").click({ button: "right" });
   const folderRevert = page.getByTestId("diff-folder-src-revert");
@@ -649,6 +642,11 @@ test("Changes keeps review navigation and controls inside its workspace tab", as
 
   const visiblePanel = page.getByTestId("working-diff-panel").filter({ visible: true });
   await expect(visiblePanel).toBeVisible();
+  await expect(visiblePanel.getByTestId("changes-repository-header")).toHaveCount(0);
+  await expect(visiblePanel.getByTestId("changes-branch-switcher")).toHaveCount(0);
+  await expect(visiblePanel.getByTestId("changes-diff-status-trigger")).toHaveCount(0);
+  await expect(visiblePanel.getByTestId("changes-selected-diff-stat")).toHaveCount(0);
+  await expect(visiblePanel.getByTestId("changes-header")).toHaveCount(1);
   await expect(visiblePanel.getByText("use-mounted-tab-set.ts", { exact: true })).toBeVisible();
   await expect(visiblePanel).toContainText("zz-deleted.ts");
   await expect(visiblePanel.getByTestId("changes-primary-cta")).toHaveCount(0);
@@ -658,34 +656,30 @@ test("Changes keeps review navigation and controls inside its workspace tab", as
   await visiblePanel.getByTestId("diff-file-0-toggle").click();
   await expect(visiblePanel.getByTestId("diff-file-0-body")).not.toBeVisible();
 
-  // Collapse-all and the layout switch are overflow-menu items, not toolbar icons.
+  await expect(visiblePanel.getByRole("button", { name: "Diff options" })).toHaveCount(0);
-  const diffOptions = visiblePanel.getByRole("button", { name: "Diff options" });
-  await expect(page.getByTestId("changes-toggle-collapse-all")).toHaveCount(0);
-  await diffOptions.click();
-  // A workspace tab has nowhere to open itself, so the menu withholds that item.
   await expect(page.getByTestId("changes-open-tab")).toHaveCount(0);
-  await page.getByTestId("changes-toggle-collapse-all").click();
+  const collapseFiles = visiblePanel.getByTestId("changes-toggle-collapse-all");
-  await diffOptions.click();
+  await expect(collapseFiles).toHaveAttribute("aria-label", "Collapse all files");
-  await expect(page.getByTestId("changes-toggle-collapse-all")).toContainText("Expand all files");
+  await collapseFiles.click();
-  await page.getByTestId("changes-toggle-collapse-all").click();
+  await expect(collapseFiles).toHaveAttribute("aria-label", "Expand all files");
+  await collapseFiles.click();
   await expect(visiblePanel.getByTestId("diff-file-0-body")).toBeVisible();
 
-  const layoutItem = page.getByTestId("changes-toggle-layout");
+  const layout = visiblePanel.getByTestId("changes-toggle-layout");
-  await diffOptions.click();
+  await expect(layout).toHaveAttribute("aria-label", "Switch to side-by-side diff");
-  await expect(layoutItem).toContainText("Side-by-side diff");
+  await layout.click();
-  // Leading icon only: the layout is still unified, so no trailing check.
+  await expect(layout).toHaveAttribute("aria-label", "Switch to unified diff");
-  await expect(layoutItem.locator("svg")).toHaveCount(1);
-  await layoutItem.click();
-  await diffOptions.click();
-  await expect(layoutItem.locator("svg")).toHaveCount(2);
 
-  await expect(page.getByText("Hide whitespace", { exact: true })).toBeVisible();
+  const whitespace = visiblePanel.getByTestId("changes-toggle-whitespace");
-  await expect(page.getByText("Wrap long lines", { exact: true })).toBeVisible();
+  await expect(whitespace).toHaveAttribute("aria-label", "Hide whitespace");
-  await expect(page.getByTestId("changes-refresh")).toHaveText("Refresh");
+  const wrapLines = visiblePanel.getByTestId("changes-toggle-wrap-lines");
-  await page.getByText("Wrap long lines", { exact: true }).click();
+  await expect(wrapLines).toHaveAttribute("aria-label", "Wrap long lines");
-  await diffOptions.click();
+  await expect(visiblePanel.getByTestId("changes-refresh")).toHaveAttribute(
-  await expect(page.getByText("Scroll long lines", { exact: true })).toBeVisible();
+    "aria-label",
-  await page.keyboard.press("Escape");
+    "Refresh",
+  );
+  await wrapLines.click();
+  await expect(wrapLines).toHaveAttribute("aria-label", "Scroll long lines");
   await expect(page.getByTestId(/^workspace-working-diff-close-/)).toHaveCount(1);
 
   await writeFile(path.join(workspace.repoPath, "src/use-mounted-tab-set.ts"), BEFORE);
@@ -701,151 +695,23 @@ test("Changes keeps review navigation and controls inside its workspace tab", as
   await expect(visiblePanel.getByRole("img", { name: "Deleted" })).toBeVisible();
 });
 
-test("desktop Changes toggles a navigation tree beside the expanded diff document", async ({
-  page,
-}, testInfo) => {
-  const workspace = await createWorkspaceWithMountedTabDiff();
-  await useUnwrappedDiffLines(page);
-  await openWorkspaceChanges(page, workspace);
-
-  await expectFlatFileList(page);
-  await expect(page.getByTestId("changes-layout-unified")).toHaveCount(0);
-  await expect(page.getByTestId("changes-layout-split")).toHaveCount(0);
-  // The tree toggle is the one icon action that stays outside the overflow menu.
-  await expect(page.getByTestId("changes-toggle-tree")).toBeVisible();
-  const [changesToolbarBox, treeToggleBox, optionsBox, treeGlyphBox, optionsGlyphBox] =
-    await Promise.all([
-      page.getByTestId("changes-header").boundingBox(),
-      page.getByTestId("changes-toggle-tree").boundingBox(),
-      page.getByRole("button", { name: "Diff options" }).boundingBox(),
-      page.getByTestId("changes-toggle-tree").locator("svg").boundingBox(),
-      page.getByRole("button", { name: "Diff options" }).locator("svg").boundingBox(),
-    ]);
-  if (!changesToolbarBox || !treeToggleBox || !optionsBox || !treeGlyphBox || !optionsGlyphBox) {
-    throw new Error("Changes toolbar geometry could not be measured");
-  }
-  expect(changesToolbarBox.height).toBe(36);
-  expect(treeToggleBox.width).toBe(24);
-  expect(treeToggleBox.height).toBe(24);
-  expect(optionsBox.width).toBe(24);
-  expect(optionsBox.height).toBe(24);
-  expect(treeGlyphBox.width).toBe(14);
-  expect(treeGlyphBox.height).toBe(14);
-  expect(optionsGlyphBox.width).toBe(14);
-  expect(optionsGlyphBox.height).toBe(14);
-  const diffOptions = page.getByRole("button", { name: "Diff options" });
-  const diffOptionsRestBackground = await diffOptions.evaluate(
-    (element) => getComputedStyle(element).backgroundColor,
-  );
-  await diffOptions.hover();
-  const diffOptionsHoverBackground = await diffOptions.evaluate(
-    (element) => getComputedStyle(element).backgroundColor,
-  );
-  expect(diffOptionsHoverBackground).not.toBe(diffOptionsRestBackground);
-  await page.getByTestId("changes-toggle-tree").hover();
-  expect(
-    await page
-      .getByTestId("changes-toggle-tree")
-      .evaluate((element) => getComputedStyle(element).backgroundColor),
-  ).toBe(diffOptionsHoverBackground);
-  await expect(page.getByTestId("changes-toggle-collapse-all")).toHaveCount(0);
-  await expect(page.getByTestId("changes-toggle-layout")).toHaveCount(0);
-
-  await page.getByTestId("changes-options-menu").click();
-  await expect(page.getByTestId("changes-options-menu-content")).toBeVisible();
-  await expect(page.getByTestId("changes-toggle-collapse-all")).toContainText("Collapse all files");
-  await expect(page.getByTestId("changes-toggle-layout")).toContainText("Side-by-side diff");
-  await expect(page.getByTestId("changes-toggle-whitespace")).toContainText("Hide whitespace");
-  await expect(page.getByTestId("changes-toggle-wrap-lines")).toContainText("Wrap long lines");
-  await expect(page.getByTestId("changes-refresh")).toHaveText("Refresh");
-  await page.getByTestId("changes-toggle-whitespace").click();
-  await page.getByTestId("changes-options-menu").click();
-  await expect(page.getByTestId("changes-toggle-whitespace")).toContainText("Show whitespace");
-  await page.keyboard.press("Escape");
-
-  await scrollToLowerUnwrappedDiffRows(page);
-  await page.getByTestId("changes-toggle-tree").click();
-  await expect(page.getByTestId("changes-toggle-tree")).toHaveAttribute("aria-selected", "true");
-  expect(
-    await page
-      .getByTestId("changes-toggle-tree")
-      .evaluate((element) => getComputedStyle(element).backgroundColor),
-  ).toBe(diffOptionsHoverBackground);
-  const tree = changesTree(page);
-  const content = changesContent(page);
-  await expect(tree.getByTestId("diff-folder-src")).toBeVisible();
-  await expect(tree.getByTestId("diff-folder-src").getByText("src", { exact: true })).toHaveCSS(
-    "user-select",
-    "none",
-  );
-  await expect(tree.getByTestId("diff-tree-file-0")).toBeVisible();
-  await expect(tree.getByTestId("diff-folder-src-toggle").locator("svg")).toHaveCount(1);
-  const folderToggleBounds = await tree.getByTestId("diff-folder-src-toggle").boundingBox();
-  const folderChevronBounds = await tree
-    .getByTestId("diff-folder-src-toggle")
-    .locator("svg")
-    .boundingBox();
-  expect(folderToggleBounds).not.toBeNull();
-  expect(folderChevronBounds).not.toBeNull();
-  expect(folderChevronBounds!.y + folderChevronBounds!.height / 2).toBeCloseTo(
-    folderToggleBounds!.y + folderToggleBounds!.height / 2,
-    0,
-  );
-  const folderLabelBounds = await tree
-    .getByTestId("diff-folder-src")
-    .getByText("src", { exact: true })
-    .boundingBox();
-  const fileLabelBounds = await tree
-    .getByTestId("diff-tree-file-0")
-    .getByText("use-mounted-tab-set.ts", { exact: true })
-    .boundingBox();
-  expect(folderLabelBounds).not.toBeNull();
-  expect(fileLabelBounds).not.toBeNull();
-  expect(fileLabelBounds!.x - folderLabelBounds!.x).toBeCloseTo(12, 0);
-
-  const folderToggle = tree.getByTestId("diff-folder-src-toggle");
-  await folderToggle.click();
-  await expect(folderToggle).toHaveAttribute("aria-selected", "true");
-  await expect(tree.getByTestId("diff-tree-file-0")).toHaveCount(0);
-  await folderToggle.click();
-  await expect(folderToggle).toHaveAttribute("aria-selected", "true");
-  await expect(tree.getByTestId("diff-tree-file-0")).toBeVisible();
-
-  const fileToggle = tree.getByTestId("diff-tree-file-0-toggle");
-  await fileToggle.click({ button: "right" });
-  await expect(fileToggle).toHaveAttribute("aria-selected", "true");
-  await expect(folderToggle).toHaveAttribute("aria-selected", "false");
-  await expect(page.getByTestId("diff-tree-file-0-context-menu")).toBeVisible();
-  await page.keyboard.press("Escape");
-
-  await fileToggle.click();
-  await expect(content.getByTestId("diff-file-0-body")).toBeVisible();
-  const contentBounds = await content.boundingBox();
-  const focusedFileBounds = await content.getByTestId("diff-file-0").boundingBox();
-  expect(contentBounds).not.toBeNull();
-  expect(focusedFileBounds).not.toBeNull();
-  expect(focusedFileBounds!.y).toBeGreaterThanOrEqual(contentBounds!.y);
-  expect(focusedFileBounds!.y).toBeLessThan(contentBounds!.y + 80);
-
-  await tree.getByTestId("diff-folder-src-toggle").click();
-  await expect(tree.getByTestId("diff-tree-file-0")).toHaveCount(0);
-
-  await page.getByTestId("changes-toggle-tree").click();
-  await expect(page.getByTestId("changes-toggle-tree")).toHaveAttribute("aria-selected", "false");
-  await expectFlatFileList(page);
-  const screenshot = testInfo.outputPath("changes-toolbar.png");
-  await page.screenshot({ path: screenshot });
-  await testInfo.attach("changes-toolbar", { path: screenshot, contentType: "image/png" });
-});
-
 test("compact Changes keeps its actions compact and menu-only", async ({ page }) => {
   const workspace = await createWorkspaceWithMountedTabDiff();
   await useUnwrappedDiffLines(page);
   await openWorkspaceChanges(page, workspace);
   await page.setViewportSize({ width: 480, height: 900 });
 
-  const actions = page.getByTestId("changes-actions-menu-trigger").filter({ visible: true });
+  const compactChangesTab = page.getByTestId("explorer-tab-changes").filter({ visible: true });
-  const options = page.getByRole("button", { name: "Diff options" }).filter({ visible: true });
+  if (!(await compactChangesTab.isVisible())) {
+    await page.getByTestId("workspace-explorer-toggle").first().click();
+  }
+  await expect(compactChangesTab).toBeVisible();
+  await compactChangesTab.click();
+  const compactExplorer = page.getByTestId("explorer-content-area").filter({ visible: true });
+  await expect(compactExplorer.getByTestId("changes-header")).toBeVisible();
+
+  const actions = compactExplorer.getByTestId("changes-actions-menu-trigger");
+  const options = compactExplorer.getByRole("button", { name: "Diff options" });
   const [actionsBox, optionsBox, glyphBox] = await Promise.all([
     actions.boundingBox(),
     options.boundingBox(),
@@ -873,7 +739,9 @@ test("compact Changes keeps its actions compact and menu-only", async ({ page })
   await expect(wrapLines).toBeVisible();
   await wrapLines.click();
   await options.click();
-  await expect(page.getByTestId("changes-toggle-wrap-lines")).toContainText("Scroll long lines");
+  await expect(
+    page.getByTestId("changes-options-menu-content").getByTestId("changes-toggle-wrap-lines"),
+  ).toContainText("Scroll long lines");
 });
 
 test("canvas diff stays sharp while its workspace pane is resized", async ({ page }) => {
@@ -883,7 +751,9 @@ test("canvas diff stays sharp while its workspace pane is resized", async ({ pag
 
   const canvas = page.getByTestId("git-diff-canvas");
   const root = page.getByTestId("git-diff-canvas-root");
-  const handle = page.getByTestId("workspace-split-resize-handle").getByRole("separator");
+  const handle = page
+    .getByTestId("workspace-explorer-sidebar-resize-handle")
+    .getByRole("separator");
   await expect(handle).toBeVisible();
   await expect
     .poll(async () => {
@@ -904,11 +774,11 @@ test("canvas diff stays sharp while its workspace pane is resized", async ({ pag
       };
     }),
   ]);
-  if (!handleBounds) throw new Error("Workspace split resize handle has no bounds");
+  if (!handleBounds) throw new Error("Explorer sidebar resize handle has no bounds");
 
   await page.mouse.move(handleBounds.x + handleBounds.width / 2, handleBounds.y + 120);
   await page.mouse.down();
-  await page.mouse.move(handleBounds.x - 120, handleBounds.y + 120);
+  await page.mouse.move(handleBounds.x + 120, handleBounds.y + 120);
   await page.evaluate(() => new Promise<void>((resolve) => requestAnimationFrame(() => resolve())));
 
   const duringDrag = await Promise.all([
@@ -1074,6 +944,7 @@ test("canvas diff uses the overlay scrollbar and its thumb controls vertical scr
   if (!bounds) throw new Error("Diff overlay scrollbar thumb has no bounds");
   await page.mouse.move(bounds.x + bounds.width / 2, bounds.y + bounds.height / 2);
   await page.mouse.down();
+  await expect(grab).toHaveCSS("cursor", "grabbing");
   await page.mouse.move(bounds.x + bounds.width / 2, bounds.y + bounds.height / 2 + 180);
   await page.mouse.up();
 
@@ -1313,24 +1184,20 @@ async function setOpenChangesPresentation(
   page: Page,
   requestedPresentation: { layout: "unified" | "split"; wrapLines: boolean },
 ): Promise<void> {
-  const options = page.getByRole("button", { name: "Diff options" }).filter({ visible: true });
+  const diffPanel = page.getByTestId("working-diff-panel").filter({ visible: true });
-
+  const layoutItem = diffPanel.getByTestId("changes-toggle-layout");
-  await options.click();
+  const currentLayout =
-  const layoutItem = page.getByTestId("changes-toggle-layout");
+    (await layoutItem.getAttribute("aria-label")) === "Switch to unified diff"
-  const currentLayout = (await layoutItem.locator("svg").count()) === 2 ? "split" : "unified";
+      ? "split"
+      : "unified";
   if (currentLayout !== requestedPresentation.layout) {
     await layoutItem.click();
-  } else {
-    await page.keyboard.press("Escape");
   }
 
-  await options.click();
+  const wrapItem = diffPanel.getByTestId("changes-toggle-wrap-lines");
-  const wrapItem = page.getByTestId("changes-toggle-wrap-lines");
+  const currentWrapLines = (await wrapItem.getAttribute("aria-label")) === "Scroll long lines";
-  const currentWrapLines = (await wrapItem.locator("svg").count()) === 2;
   if (currentWrapLines !== requestedPresentation.wrapLines) {
     await wrapItem.click();
-  } else {
-    await page.keyboard.press("Escape");
   }
 }
 
@@ -1365,12 +1232,6 @@ async function releaseBrowserFontLoads(page: Page): Promise<void> {
   });
 }
 
-async function expectFlatFileList(page: Page): Promise<void> {
-  await expect(page.locator('[data-testid^="diff-folder-"]')).toHaveCount(0);
-  await expect(page.getByTestId("diff-file-0")).toContainText("use-mounted-tab-set.ts");
-  await expect(page.getByTestId("diff-file-0")).toContainText("src");
-}
-
 async function expectDiffCodeFontSize(page: Page, fontSize: number): Promise<void> {
   const canvas = page.getByTestId("git-diff-canvas");
   await expect
@@ -1491,6 +1352,7 @@ async function openWorkspaceChanges(page: Page, workspace: DirtyWorkspace): Prom
   await page.setViewportSize({ width: 1400, height: 900 });
   await page.goto(buildHostWorkspaceRoute(getServerId(), workspace.id));
   await waitForWorkspaceTabsVisible(page);
+  await page.getByTestId("workspace-explorer-toggle").first().click();
   await openChangesInVisibleExplorer(page);
   await expectExpandedMountedTabDiff(page);
 }
@@ -1507,13 +1369,27 @@ async function openSelectionWorkspaceChanges(page: Page, workspace: DirtyWorkspa
   await page.goto(buildHostWorkspaceRoute(getServerId(), workspace.id));
   await waitForWorkspaceTabsVisible(page);
   await openChangesPanel(page);
-  await expect(page.getByText("selection.ts")).toBeVisible({ timeout: 30_000 });
+  const diffPanel = page.getByTestId("working-diff-panel").filter({ visible: true });
+  await expect(diffPanel.getByTestId("diff-file-0-name")).toHaveText("selection.ts", {
+    timeout: 30_000,
+  });
   await expectExpandedMountedTabDiff(page);
 }
 
 async function openChangesInVisibleExplorer(page: Page): Promise<void> {
-  await openChangesPanel(page);
+  const explorer = page.getByTestId("workspace-explorer-sidebar");
-  await expect(page.getByText("use-mounted-tab-set.ts")).toBeVisible({ timeout: 30_000 });
+  await expect(explorer).toBeVisible({ timeout: 30_000 });
+  const changesTab = explorer.getByRole("button", { name: /Working tree diff/i }).first();
+  await changesTab.click();
+  const changedFile = explorer
+    .locator('[data-testid^="diff-tree-file-"][data-testid$="-toggle"]')
+    .filter({ visible: true })
+    .first();
+  await expect(changedFile).toBeVisible({ timeout: 30_000 });
+  await changedFile.click();
+  await expect(page.getByTestId("working-diff-panel").filter({ visible: true })).toBeVisible({
+    timeout: 30_000,
+  });
 }
 
 async function expectExpandedMountedTabDiff(page: Page): Promise<void> {

packages/app/e2e/browser/changes-shortcut-placement.spec.ts

@@ -1,21 +1,12 @@
-import { expect, test, type Page } from "../support/fixtures";
+import { expect, test } from "../support/fixtures";
 import { gotoWorkspace } from "../support/helpers/launcher";
 import { seedWorkspace } from "../support/helpers/seed-client";
 import { waitForWorkspaceTabsVisible } from "../support/helpers/workspace-tabs";
 
-const APP_SETTINGS_KEY = "@paseo:app-settings";
 const CHANGES_SHORTCUT = `${process.platform === "darwin" ? "Meta" : "Control"}+Shift+G`;
 
-function mainPane(page: Page) {
+test("Changes shortcut reveals the Changes tree in Explorer", async ({ page }) => {
-  return page.getByTestId("workspace-pane-main").filter({ visible: true });
+  const workspace = await seedWorkspace({ repoPrefix: "changes-shortcut-explorer-" });
-}
-
-function sidePanel(page: Page) {
-  return page.getByTestId("workspace-side-panel").filter({ visible: true });
-}
-
-test("Changes shortcut follows the default Side panel placement", async ({ page }) => {
-  const workspace = await seedWorkspace({ repoPrefix: "changes-shortcut-side-" });
 
   try {
     await page.setViewportSize({ width: 1400, height: 900 });
@@ -24,34 +15,12 @@ test("Changes shortcut follows the default Side panel placement", async ({ page
 
     await page.keyboard.press(CHANGES_SHORTCUT);
 
-    await expect(sidePanel(page).getByTestId("workspace-tab-working_diff")).toBeVisible({
+    const explorer = page.getByTestId("workspace-explorer-sidebar").filter({ visible: true });
+    await expect(explorer.getByTestId("explorer-sidebar-tab-changes_tree")).toBeVisible({
       timeout: 30_000,
     });
-    await expect(mainPane(page).getByTestId("workspace-tab-working_diff")).toHaveCount(0);
+    await expect(explorer.getByTestId("changes-tree-panel")).toBeVisible();
-  } finally {
+    await expect(page.getByTestId("workspace-tab-working_diff")).toHaveCount(0);
-    await workspace.cleanup();
-  }
-});
-
-test("Changes shortcut uses the focused pane when Side panel placement is off", async ({
-  page,
-}) => {
-  await page.addInitScript((settingsKey) => {
-    localStorage.setItem(settingsKey, JSON.stringify({ openSupportingTabsInSidePanel: false }));
-  }, APP_SETTINGS_KEY);
-  const workspace = await seedWorkspace({ repoPrefix: "changes-shortcut-pane-" });
-
-  try {
-    await page.setViewportSize({ width: 1400, height: 900 });
-    await gotoWorkspace(page, workspace.workspaceId);
-    await waitForWorkspaceTabsVisible(page);
-
-    await page.keyboard.press(CHANGES_SHORTCUT);
-
-    await expect(mainPane(page).getByTestId("workspace-tab-working_diff")).toBeVisible({
-      timeout: 30_000,
-    });
-    await expect(sidePanel(page)).toHaveCount(0);
   } finally {
     await workspace.cleanup();
   }

packages/app/e2e/browser/chat-outline.spec.ts

@@ -4,6 +4,7 @@ import {
   clickChatOutlineRowEdge,
   disableChatOutlineFromAppearance,
   expectActiveChatOutlinePrompt,
+  expectActiveChatOutlinePromptMovedFrom,
   expectChatOutlinePreview,
   expectChatOutlinePrompts,
   expectChatOutlinePromptToRemainBare,
@@ -29,7 +30,6 @@ import {
   openAgentTimeline,
   scrollThroughOlderHistoryPages,
   scrollTimelineToNewestLoadedEdge,
-  scrollTimelineToOldestLoadedEdge,
   seedLongMockAgentTimeline,
   type LongTimelineAgent,
 } from "../support/helpers/timeline-pagination";
@@ -130,11 +130,12 @@ test.describe("desktop chat outline", () => {
       await expectOneActiveChatOutlinePrompt(page);
 
       await clickChatOutlineRowEdge(page, 4);
-      await expectTimelinePromptVisible(page, agent.prompts[3]);
+      await expectTimelinePromptLandedBelowTop(page, agent.prompts[3]);
       await expectActiveChatOutlinePrompt(page, 4);
 
-      await scrollTimelineToOldestLoadedEdge(page);
+      await scrollTimelineToNewestLoadedEdge(page);
-      await expectActiveChatOutlinePrompt(page, 1);
+      await expectTimelinePromptVisible(page, agent.newestPrompt);
+      await expectActiveChatOutlinePromptMovedFrom(page, 4);
     });
 
     test("keeps a clicked prompt free of persistent selection chrome", async ({ page }) => {

packages/app/e2e/browser/command-center-agent-controls.spec.ts

@@ -4,6 +4,7 @@ import { closeCommandCenter, openCommandCenter } from "../support/helpers/comman
 import {
   applyCommandCenterAgentControls,
   chooseCommandCenterAgentControl,
+  openCommandCenterForAgent,
   expectCommandCenterAgentControlSelected,
   expectFocusedAgentControls,
   expectWorkspaceAgentConfiguration,
@@ -12,7 +13,9 @@ import {
 } from "../support/helpers/command-center-agent-controls";
 import { clickNewChat, gotoWorkspace } from "../support/helpers/launcher";
 import { openAgentRoute, seedMockAgentWorkspace } from "../support/helpers/mock-agent";
+import { expectAppRoute } from "../support/helpers/route-assertions";
 import { seedWorkspace } from "../support/helpers/seed-client";
+import { buildSchedulesRoute } from "@/utils/host-routes";
 
 const CREATE_AGENT_PREFERENCES_KEY = "@paseo:create-agent-preferences";
 
@@ -76,6 +79,107 @@ test.describe("Command Center agent controls", () => {
     }
   });
 
+  test("activates the best-matching row, not the highest-ranked group", async ({ page }) => {
+    // "Mode › Load Test" matches "load" at offset 0; every "Model › Mock Load Test › …" row
+    // matches at offset 5. Models used to outrank modes by fixed group rank, so Enter picked a
+    // model. Asserting both model and mode catches either row winning.
+    const workspace = await seedMockAgentWorkspace({
+      repoPrefix: "command-center-relevance-",
+      title: "Command Center relevance",
+      model: "five-minute-stream",
+    });
+    try {
+      await workspace.client.setAgentMode(workspace.agentId, "approval-test");
+      const input = await openCommandCenterForAgent(page, workspace);
+      await input.fill("load");
+      await page.keyboard.press("Enter");
+
+      await expectWorkspaceAgentConfiguration(workspace, {
+        id: workspace.agentId,
+        provider: "mock",
+        model: "five-minute-stream",
+        modeId: "load-test",
+      });
+    } finally {
+      await workspace.cleanup();
+    }
+  });
+
+  test("matches query tokens in any order", async ({ page }) => {
+    // "Mode › Load test" flattens to "mode load test", so the reversed query "test load" is never
+    // a substring of it. Only per-token matching finds this row.
+    const workspace = await seedMockAgentWorkspace({
+      repoPrefix: "command-center-tokenized-",
+      title: "Command Center tokenized search",
+      model: "five-minute-stream",
+    });
+    try {
+      await workspace.client.setAgentMode(workspace.agentId, "legacy-mode");
+      await openAgentRoute(page, {
+        workspaceId: workspace.workspaceId,
+        agentId: workspace.agentId,
+      });
+      await openCommandCenter(page);
+      await chooseCommandCenterAgentControl({
+        page,
+        query: "test load",
+        choice: "Mode › Load test",
+      });
+
+      await expectWorkspaceAgentConfiguration(workspace, {
+        id: workspace.agentId,
+        provider: "mock",
+        model: "five-minute-stream",
+        modeId: "load-test",
+      });
+    } finally {
+      await workspace.cleanup();
+    }
+  });
+
+  test("keeps an action first when the action is the best match", async ({ page }) => {
+    const workspace = await seedMockAgentWorkspace({
+      repoPrefix: "command-center-action-priority-",
+      title: "Command Center action priority",
+      model: "five-minute-stream",
+    });
+    try {
+      const input = await openCommandCenterForAgent(page, workspace);
+      await input.fill("sched");
+      await page.keyboard.press("Enter");
+
+      await expectAppRoute(page, buildSchedulesRoute(), { timeout: 30_000 });
+    } finally {
+      await workspace.cleanup();
+    }
+  });
+
+  test("drops an arrow-key selection once the query changes", async ({ page }) => {
+    const workspace = await seedMockAgentWorkspace({
+      repoPrefix: "command-center-active-reset-",
+      title: "Command Center active reset",
+      model: "five-minute-stream",
+    });
+    try {
+      await workspace.client.setAgentMode(workspace.agentId, "approval-test");
+      const input = await openCommandCenterForAgent(page, workspace);
+      await input.fill("loa");
+      // Moves the highlight onto a model row, which still matches after the next keystroke.
+      await page.keyboard.press("ArrowDown");
+      await input.fill("load");
+      await page.keyboard.press("Enter");
+
+      await expectWorkspaceAgentConfiguration(workspace, {
+        id: workspace.agentId,
+        provider: "mock",
+        model: "five-minute-stream",
+        modeId: "load-test",
+      });
+    } finally {
+      await workspace.cleanup();
+    }
+  });
+
   test("applies draft model and setting choices to the created agent", async ({ page }) => {
     const workspace = await seedWorkspace({ repoPrefix: "command-center-draft-controls-" });
     await seedMockDraftPreferences(page);

packages/app/e2e/browser/command-center-host.spec.ts

@@ -1,53 +1,14 @@
 import { randomUUID } from "node:crypto";
-import { expect } from "@playwright/test";
 import { test } from "../support/fixtures";
 import { gotoAppShell } from "../support/helpers/app";
 import { createIdleAgent } from "../support/helpers/archive-tab";
 import { openCommandCenter } from "../support/helpers/command-center";
-import { addOfflineHostAndReload } from "../support/helpers/hosts";
 import { expectAgentTabActive } from "../support/helpers/launcher";
 import { seedWorkspace } from "../support/helpers/seed-client";
-import { getServerId } from "../support/helpers/server-id";
-
-const PRIMARY_HOST_LABEL = "Primary Host";
-const SECONDARY_HOST_ID = "host-command-center-secondary";
 
 test.describe("Command center host labels", () => {
   test.describe.configure({ timeout: 180_000 });
 
-  test("agent results show the host they live on when more than one host exists", async ({
-    page,
-  }) => {
-    const seeded = await seedWorkspace({ repoPrefix: "command-center-host-" });
-    const title = `cc-host-${randomUUID().slice(0, 8)}`;
-
-    try {
-      const agent = await createIdleAgent(seeded.client, {
-        cwd: seeded.repoPath,
-        workspaceId: seeded.workspaceId,
-        title,
-      });
-
-      // A second (offline) host makes the view multi-host, which is when the host label earns its space.
-      await gotoAppShell(page);
-      await addOfflineHostAndReload(page, {
-        serverId: SECONDARY_HOST_ID,
-        label: "Secondary Host",
-        primaryLabel: PRIMARY_HOST_LABEL,
-      });
-
-      const panel = await openCommandCenter(page);
-
-      // The shared daemon may carry agents from other specs, so target this agent by its id.
-      const row = panel.getByTestId(`command-center-agent-${getServerId()}:${agent.id}`);
-      await expect(row).toBeVisible({ timeout: 30_000 });
-      await expect(row).toContainText(title);
-      await expect(row).toContainText(PRIMARY_HOST_LABEL);
-    } finally {
-      await seeded.cleanup();
-    }
-  });
-
   test("selecting an agent result opens its workspace tab", async ({ page }) => {
     const seeded = await seedWorkspace({ repoPrefix: "command-center-agent-navigation-" });
     const title = `cc-navigation-${randomUUID().slice(0, 8)}`;

packages/app/e2e/browser/commit-diff-panel.spec.ts

@@ -3,7 +3,7 @@ import { writeFile } from "node:fs/promises";
 import path from "node:path";
 import type { Locator } from "@playwright/test";
 import { test, expect } from "../support/fixtures";
-import { openChangesPanel } from "../support/helpers/workspace-tabs";
+import { openChangesTreePanel } from "../support/helpers/workspace-tabs";
 
 const COMMIT_SUBJECT = "Show commit timestamps";
 
@@ -15,7 +15,7 @@ test("commit history explains when the workspace has no commits ahead of its bas
   execFileSync("git", ["checkout", "-b", "feature"], { cwd: workspace.repoPath, stdio: "ignore" });
   await workspace.navigateTo();
 
-  await openChangesPanel(page);
+  await openChangesTreePanel(page);
   const commitsSection = page.getByRole("button", { name: /Commits/i });
   await expect(commitsSection).toBeVisible({ timeout: 30_000 });
   await commitsSection.click();
@@ -35,7 +35,7 @@ test("commit history shows dates and shares diff layout preferences", async ({
   await page.setViewportSize({ width: 1400, height: 900 });
   await workspace.navigateTo();
 
-  await openChangesPanel(page);
+  await openChangesTreePanel(page);
   const commitsSection = page.getByRole("button", { name: /Commits/i });
   await expect(commitsSection).toBeVisible({ timeout: 30_000 });
   await commitsSection.click();
@@ -60,8 +60,8 @@ test("commit history shows dates and shares diff layout preferences", async ({
     throw new Error("Commit-diff toolbar geometry could not be measured");
   }
   expect(commitToolbarBox.height).toBe(36);
-  expect(layoutToggleBox.width).toBe(24);
+  expect(layoutToggleBox.width).toBe(20);
-  expect(layoutToggleBox.height).toBe(24);
+  expect(layoutToggleBox.height).toBe(20);
   expect(layoutToggleGlyphBox.width).toBe(14);
   expect(layoutToggleGlyphBox.height).toBe(14);
   await expect(layoutToggle).toHaveAccessibleName("Switch to side-by-side diff");

packages/app/e2e/browser/composer-diff-stat.spec.ts

@@ -38,7 +38,10 @@ async function seedChangedAgent(repoPrefix: string) {
   }
 }
 
-test("composer diff stat toggles Changes in the preferred Side panel", async ({ page }) => {
+test("composer diff stat opens Changes in the configured side pane", async ({ page }) => {
+  await page.addInitScript((settingsKey) => {
+    localStorage.setItem(settingsKey, JSON.stringify({ openInSidePane: { changesLinks: true } }));
+  }, APP_SETTINGS_KEY);
   const workspace = await seedChangedAgent("composer-diff-stat-side-");
 
   try {
@@ -54,31 +57,24 @@ test("composer diff stat toggles Changes in the preferred Side panel", async ({
     await expect(pill).toContainText("-0");
     await pill.click();
 
-    const sidePanel = page.getByTestId("workspace-side-panel").filter({ visible: true });
+    const sidePane = page
-    await expect(sidePanel.getByTestId("workspace-tab-working_diff")).toBeVisible({
+      .locator('[data-testid^="workspace-pane-"]')
+      .filter({ visible: true })
+      .filter({ has: page.getByTestId("working-diff-panel") });
+    await expect(sidePane.getByTestId("workspace-tab-working_diff")).toBeVisible({
       timeout: 30_000,
     });
-    await expect(sidePanel.getByTestId("working-diff-panel")).toBeVisible({ timeout: 30_000 });
+    await expect(sidePane.getByTestId("working-diff-panel")).toBeVisible({ timeout: 30_000 });
+    await expect(visibleMainPane(page).getByTestId("working-diff-panel")).toHaveCount(0);
 
-    await test.step("switching from another Side panel view reveals Changes", async () => {
+    await test.step("Explorer navigation does not replace the side pane", async () => {
       await openFilesPanel(page);
-      await expect(sidePanel.getByTestId("file-explorer-tree-scroll")).toBeVisible();
+      await expect(page.getByTestId("workspace-explorer-sidebar")).toContainText("Files");
 
       await pill.click();
-      await expect(sidePanel.getByTestId("working-diff-panel")).toBeVisible();
+      await expect(sidePane.getByTestId("working-diff-panel")).toBeVisible();
-    });
-
-    await test.step("clicking visible Changes hides the panel without closing its tab", async () => {
-      await pill.click();
-      await expect(sidePanel).toHaveCount(0);
       await expect(page.getByTestId("workspace-tab-working_diff")).toHaveCount(1);
     });
-
-    await test.step("clicking again restores Changes", async () => {
-      await pill.click();
-      await expect(sidePanel.getByTestId("workspace-tab-working_diff")).toBeVisible();
-      await expect(sidePanel.getByTestId("working-diff-panel")).toBeVisible();
-    });
   } finally {
     await workspace.cleanup();
   }
@@ -96,19 +92,16 @@ test("composer diff stat opens the compact explorer instead of a Changes tab", a
 
     await page.getByTestId("composer-diff-stat-pill").click();
 
-    await expect(page.getByTestId("changes-header")).toBeVisible({ timeout: 30_000 });
+    await expect(page.getByTestId("changes-header").filter({ visible: true }).first()).toBeVisible({
+      timeout: 30_000,
+    });
     await expect(page.getByTestId("workspace-tab-working_diff")).toHaveCount(0);
   } finally {
     await workspace.cleanup();
   }
 });
 
-test("composer diff stat opens Changes in the focused pane when Side panel routing is off", async ({
+test("composer diff stat opens Changes in the focused pane by default", async ({ page }) => {
-  page,
-}) => {
-  await page.addInitScript((settingsKey) => {
-    localStorage.setItem(settingsKey, JSON.stringify({ openSupportingTabsInSidePanel: false }));
-  }, APP_SETTINGS_KEY);
   const workspace = await seedChangedAgent("composer-diff-stat-tab-");
 
   try {
@@ -125,7 +118,9 @@ test("composer diff stat opens Changes in the focused pane when Side panel routi
       timeout: 30_000,
     });
     await expect(mainPane.getByTestId("working-diff-panel")).toBeVisible({ timeout: 30_000 });
-    await expect(page.getByTestId("workspace-side-panel")).toHaveCount(0);
+    await expect(
+      page.locator('[data-testid^="workspace-pane-"]').filter({ visible: true }),
+    ).toHaveCount(1);
   } finally {
     await workspace.cleanup();
   }

packages/app/e2e/browser/composer-whitespace.spec.ts

@@ -99,6 +99,7 @@ test("composer growth keeps a bottom-pinned chat at the bottom", async ({ page }
     repoPrefix: "composer-bottom-anchor-",
     title: "Composer bottom anchor",
     initialPrompt: "Produce enough content to make the chat scrollable.",
+    model: "ten-second-stream",
   });
 
   try {

packages/app/e2e/browser/direct-terminal-shortcut-pane-placement.spec.ts

@@ -1,7 +1,8 @@
 import { expect, test } from "../support/fixtures";
+import { runWorkspaceActionFromCommandCenter } from "../support/helpers/command-center-workspace-actions";
 import { gotoWorkspace, pressDirectNewTabShortcut } from "../support/helpers/launcher";
 import { seedWorkspace } from "../support/helpers/seed-client";
-import { openChangesPanel, waitForWorkspaceTabsVisible } from "../support/helpers/workspace-tabs";
+import { waitForWorkspaceTabsVisible } from "../support/helpers/workspace-tabs";
 
 test.describe("Direct terminal shortcut pane placement", () => {
   test("opens a terminal in the focused pane", async ({ page }) => {
@@ -11,21 +12,31 @@ test.describe("Direct terminal shortcut pane placement", () => {
       await gotoWorkspace(page, workspace.workspaceId);
       await waitForWorkspaceTabsVisible(page);
 
-      await openChangesPanel(page);
+      await runWorkspaceActionFromCommandCenter(page, "Split pane right");
-      const focusedPane = page
+      const focusedPaneChild = page
-        .getByTestId("workspace-tabs-row")
+        .getByTestId("split-group-child")
-        .filter({ has: page.getByTestId("workspace-tab-working_diff") })
+        .filter({ has: page.getByTestId("workspace-new-tab-panel") });
-        .first();
+      const originalPaneChild = page
-      const primaryPane = page
+        .getByTestId("split-group-child")
-        .getByTestId("workspace-tabs-row")
+        .filter({ hasNot: page.getByTestId("workspace-new-tab-panel") });
-        .filter({ hasNot: page.getByTestId("workspace-tab-working_diff") })
+      await expect(focusedPaneChild).toBeVisible();
-        .first();
+      const focusedPaneId = await focusedPaneChild
+        .locator('[data-testid^="workspace-pane-"]')
+        .getAttribute("data-testid");
+      const originalPaneId = await originalPaneChild
+        .locator('[data-testid^="workspace-pane-"]')
+        .getAttribute("data-testid");
+      expect(focusedPaneId).not.toBeNull();
+      expect(originalPaneId).not.toBeNull();
+      const focusedPane = page.getByTestId(focusedPaneId!);
+      const originalPane = page.getByTestId(originalPaneId!);
+
       await pressDirectNewTabShortcut(page, "t");
 
       await expect(focusedPane.locator('[data-testid^="workspace-tab-terminal_"]')).toHaveCount(1, {
         timeout: 30_000,
       });
-      await expect(primaryPane.locator('[data-testid^="workspace-tab-terminal_"]')).toHaveCount(0);
+      await expect(originalPane.locator('[data-testid^="workspace-tab-terminal_"]')).toHaveCount(0);
     } finally {
       await workspace.cleanup();
     }

packages/app/e2e/browser/empty-pane-keyboard.spec.ts

@@ -13,38 +13,25 @@ async function expectLauncherSelection(launcher: Locator, name: string): Promise
   await expect(launcher.getByRole("button", { name, exact: true })).toBeFocused();
 }
 
-async function openSidePanelWithKeyboard(page: Page): Promise<Locator> {
+async function openExplorerWithKeyboard(page: Page): Promise<Locator> {
   const modifier = process.platform === "darwin" ? "Meta" : "Control";
   await page.keyboard.press(`${modifier}+E`);
-  const launcher = page
+  const explorer = page.getByTestId("workspace-explorer-sidebar").filter({ visible: true });
-    .getByTestId("workspace-side-panel")
+  await expect(explorer).toBeVisible({ timeout: 30_000 });
-    .filter({ visible: true })
+  return explorer;
-    .getByTestId("workspace-new-tab-panel");
-  await expect(launcher).toBeVisible({ timeout: 30_000 });
-  return launcher;
 }
 
 test.describe("New tab keyboard launcher", () => {
-  test("Cmd+E focuses the launcher and Enter opens the selected view", async ({ page }) => {
+  test("Cmd+E reveals the repository Changes tree", async ({ page }) => {
-    const workspace = await seedWorkspace({ repoPrefix: "empty-pane-side-panel-keyboard-" });
+    const workspace = await seedWorkspace({ repoPrefix: "explorer-keyboard-" });
 
     try {
       await gotoWorkspace(page, workspace.workspaceId);
       await waitForWorkspaceTabsVisible(page);
 
-      const launcher = await openSidePanelWithKeyboard(page);
+      const explorer = await openExplorerWithKeyboard(page);
-      await expectLauncherSelection(launcher, "Changes");
+      await expect(explorer.getByTestId("explorer-sidebar-tab-changes_tree")).toBeVisible();
-
+      await expect(explorer.getByTestId("changes-tree-panel")).toBeVisible();
-      await page.keyboard.press("ArrowDown");
-      await expectLauncherSelection(launcher, "Files");
-      await page.keyboard.press("Enter");
-
-      await expect(
-        page
-          .getByTestId("workspace-side-panel")
-          .filter({ visible: true })
-          .getByTestId("workspace-tab-files"),
-      ).toBeVisible({ timeout: 30_000 });
     } finally {
       await workspace.cleanup();
     }
@@ -65,14 +52,12 @@ test.describe("New tab keyboard launcher", () => {
       await page.keyboard.press("ArrowDown");
       await expectLauncherSelection(launcher, "Terminal");
       await page.keyboard.press("ArrowDown");
-      await expectLauncherSelection(launcher, "Changes");
+      await expectLauncherSelection(launcher, "Diff");
-      await page.keyboard.press("ArrowDown");
-      await expectLauncherSelection(launcher, "Files");
       await page.keyboard.press("Enter");
 
-      await expect(page.getByTestId("workspace-tab-files").filter({ visible: true })).toBeVisible({
+      await expect(
-        timeout: 30_000,
+        page.getByTestId("workspace-tab-working_diff").filter({ visible: true }),
-      });
+      ).toBeVisible({ timeout: 30_000 });
     } finally {
       await workspace.cleanup();
     }

packages/app/e2e/browser/explorer-pane-placement.spec.ts

@@ -8,7 +8,10 @@ import { expect, type Locator, type Page } from "@playwright/test";
 import { test } from "../support/fixtures";
 import { gotoWorkspace } from "../support/helpers/launcher";
 import { seedWorkspace } from "../support/helpers/seed-client";
-import { openChangesPanel, waitForWorkspaceTabsVisible } from "../support/helpers/workspace-tabs";
+import {
+  openChangesTreePanel,
+  waitForWorkspaceTabsVisible,
+} from "../support/helpers/workspace-tabs";
 
 function visible(page: Page, testId: string): Locator {
   return page.getByTestId(testId).filter({ visible: true });
@@ -22,23 +25,18 @@ function draftTabChip(page: Page): Locator {
   return page.locator('[data-testid^="workspace-tab-draft_"]').filter({ visible: true });
 }
 
-/** The explorer pane is the only tab row carrying the Changes tab. */
+/** The Explorer has its own fixed tab rail, separate from workspace pane rows. */
 function explorerTabRow(page: Page): Locator {
-  return visible(page, "workspace-tabs-row").filter({
+  return visible(page, "explorer-sidebar-tab-rail");
-    has: page.getByTestId("workspace-tab-working_diff"),
-  });
 }
 
 function mainTabRow(page: Page): Locator {
-  return visible(page, "workspace-tabs-row").filter({
+  return visible(page, "workspace-tabs-row");
-    hasNot: page.getByTestId("workspace-tab-working_diff"),
-  });
 }
 
-async function focusExplorerPane(page: Page): Promise<void> {
+async function selectExplorerChanges(page: Page): Promise<void> {
-  await openChangesPanel(page);
+  await openChangesTreePanel(page);
-  const changesTab = visible(page, "workspace-tab-working_diff").first();
+  await expect(visible(page, "changes-tree-panel").first()).toBeVisible();
-  await expect(changesTab).toHaveAttribute("aria-selected", "true");
 }
 
 async function closeSeededDraftInMainPane(page: Page): Promise<void> {
@@ -115,8 +113,8 @@ test.describe("explorer pane tab placement", () => {
         await expect(draftTabChip(page).first()).toBeVisible({ timeout: 30_000 });
       });
 
-      await test.step("focus the explorer pane", async () => {
+      await test.step("select Changes in Explorer", async () => {
-        await focusExplorerPane(page);
+        await selectExplorerChanges(page);
       });
 
       await test.step("an agent appearing now opens in the main pane, not the explorer pane", async () => {
@@ -140,11 +138,8 @@ test.describe("explorer pane tab placement", () => {
         await expect(
           explorerTabRow(page).first().getByTestId(`workspace-tab-agent_${agentId}`),
         ).toHaveCount(0);
-        // The background open must not steal the explorer pane's focus.
+        // The background open must not change the selected Explorer view.
-        await expect(visible(page, "workspace-tab-working_diff").first()).toHaveAttribute(
+        await expect(visible(page, "changes-tree-panel").first()).toBeVisible();
-          "aria-selected",
-          "true",
-        );
       });
 
       await test.step("close the draft; the agent is the main pane's only tab", async () => {
@@ -170,8 +165,9 @@ test.describe("explorer pane tab placement", () => {
           body: await page.screenshot(),
           contentType: "image/png",
         });
-        // The split must have taken: agent pane + New main + explorer = 3 tab rows.
+        // The split must have taken: agent pane + New main. Explorer keeps its own rail.
-        await expect(visible(page, "workspace-tabs-row")).toHaveCount(3, { timeout: 10_000 });
+        await expect(visible(page, "workspace-tabs-row")).toHaveCount(2, { timeout: 10_000 });
+        await expect(explorerTabRow(page)).toHaveCount(1);
         await expect(page.getByTestId("workspace-new-tab-panel")).toBeVisible();
       });
 

packages/app/e2e/browser/explorer-sidebar.spec.ts

@@ -0,0 +1,48 @@
+import { expect, test } from "../support/fixtures";
+import { gotoWorkspace } from "../support/helpers/launcher";
+import { seedWorkspace } from "../support/helpers/seed-client";
+import {
+  ensureExplorerSidebar,
+  openFilesPanel,
+  waitForWorkspaceTabsVisible,
+} from "../support/helpers/workspace-tabs";
+
+function explorerSidebar(page: Parameters<typeof ensureExplorerSidebar>[0]) {
+  return page.getByTestId("workspace-explorer-sidebar").filter({ visible: true });
+}
+
+test.describe("Explorer sidebar", () => {
+  test("starts with Files and Changes, switches views, and toggles without changing main", async ({
+    page,
+  }) => {
+    const workspace = await seedWorkspace({ repoPrefix: "explorer-sidebar-defaults-" });
+
+    try {
+      await gotoWorkspace(page, workspace.workspaceId);
+      await waitForWorkspaceTabsVisible(page);
+      const mainTabsBefore = await page
+        .getByTestId("workspace-pane-main")
+        .locator('[data-testid^="workspace-tab-"]')
+        .count();
+
+      const explorer = await ensureExplorerSidebar(page);
+      await expect(explorer.getByTestId("explorer-sidebar-tab-files")).toBeVisible();
+      await expect(explorer.getByTestId("explorer-sidebar-tab-changes_tree")).toBeVisible();
+      await expect(explorer.getByTestId("workspace-new-tab-button")).toHaveCount(0);
+
+      await openFilesPanel(page);
+      await expect(explorer.getByTestId("file-explorer-tree-scroll")).toBeVisible();
+
+      await explorer.getByTestId("explorer-sidebar-tab-changes_tree").click();
+      await expect(explorer.getByTestId("changes-tree-panel")).toBeVisible();
+
+      await page.getByTestId("workspace-explorer-toggle").first().click();
+      await expect(explorerSidebar(page)).toHaveCount(0);
+      await expect(
+        page.getByTestId("workspace-pane-main").locator('[data-testid^="workspace-tab-"]'),
+      ).toHaveCount(mainTabsBefore);
+    } finally {
+      await workspace.cleanup();
+    }
+  });
+});

packages/app/e2e/browser/explorer-surface-upgrade.spec.ts

@@ -19,14 +19,8 @@ function readPersistedPanelState(page: Page): Promise<string | null> {
   return page.evaluate(() => localStorage.getItem("panel-state"));
 }
 
-/** Only the docked sidebar ever rendered `explorer-header` on a wide layout. */
+function explorerSidebar(page: Page): Locator {
-function dockedSidebar(page: Page): Locator {
+  return visible(page, "workspace-explorer-sidebar");
-  return visible(page, "explorer-header");
-}
-
-/** The desktop companion surface is a hideable side panel. */
-function sidePanel(page: Page): Locator {
-  return visible(page, "workspace-side-panel");
 }
 
 /** Seed exactly what a pre-pane build wrote after the user opened the sidebar once. */
@@ -65,18 +59,18 @@ test.describe("explorer surface after upgrading from the docked sidebar", () =>
       await gotoWorkspace(page, workspace.workspaceId);
       await waitForWorkspaceTabsVisible(page);
 
-      await test.step("no docked sidebar, on load or after toggling", async () => {
+      await test.step("the retired flag does not reveal Explorer", async () => {
-        await expect(dockedSidebar(page)).toHaveCount(0);
+        await expect(explorerSidebar(page)).toHaveCount(0);
-
         const toggle = visible(page, "workspace-explorer-toggle").first();
         await toggle.click();
-        await expect(sidePanel(page)).toHaveCount(1, { timeout: 15_000 });
+        await expect(explorerSidebar(page)).toHaveCount(1, { timeout: 15_000 });
-        await expect(sidePanel(page).getByTestId("workspace-new-tab-panel")).toBeVisible();
+        await expect(explorerSidebar(page).getByTestId("explorer-sidebar-tab-files")).toBeVisible();
-        await expect(dockedSidebar(page)).toHaveCount(0);
+        await expect(
+          explorerSidebar(page).getByTestId("explorer-sidebar-tab-changes_tree"),
+        ).toBeVisible();
 
         await toggle.click();
-        await expect(sidePanel(page)).toHaveCount(0, { timeout: 15_000 });
+        await expect(explorerSidebar(page)).toHaveCount(0, { timeout: 15_000 });
-        await expect(dockedSidebar(page)).toHaveCount(0);
       });
 
       await test.step("the retired keys are migrated out of storage", async () => {
@@ -107,22 +101,22 @@ test.describe("explorer surface after upgrading from the docked sidebar", () =>
 
       await test.step("open the explorer so both sides are showing", async () => {
         await toggle.click();
-        await expect(sidePanel(page)).toHaveCount(1, { timeout: 15_000 });
+        await expect(explorerSidebar(page)).toHaveCount(1, { timeout: 15_000 });
-        await expect(sidePanel(page).getByTestId("workspace-new-tab-panel")).toBeVisible();
+        await expect(explorerSidebar(page).getByTestId("explorer-sidebar-tab-files")).toBeVisible();
         await expect(agentList).toHaveCount(1);
       });
 
       await test.step("the shortcut collapses both", async () => {
         await page.keyboard.press(`${modifier}+.`);
-        await expect(sidePanel(page)).toHaveCount(0, { timeout: 15_000 });
+        await expect(explorerSidebar(page)).toHaveCount(0, { timeout: 15_000 });
         await expect(agentList).toHaveCount(0);
       });
 
       await test.step("the shortcut restores both", async () => {
         await page.keyboard.press(`${modifier}+.`);
         await expect(agentList).toHaveCount(1, { timeout: 15_000 });
-        await expect(sidePanel(page)).toHaveCount(1, { timeout: 15_000 });
+        await expect(explorerSidebar(page)).toHaveCount(1, { timeout: 15_000 });
-        await expect(sidePanel(page).getByTestId("workspace-new-tab-panel")).toBeVisible();
+        await expect(explorerSidebar(page).getByTestId("explorer-sidebar-tab-files")).toBeVisible();
       });
     } finally {
       await workspace.cleanup();

packages/app/e2e/browser/file-editing.spec.ts

@@ -9,6 +9,8 @@ import {
 import { installDaemonWebSocketGate } from "../support/helpers/daemon-websocket-gate";
 import { openAgentRoute, seedMockAgentWorkspace } from "../support/helpers/mock-agent";
 
+const APP_SETTINGS_KEY = "@paseo:app-settings";
+
 const RED_PIXEL = Buffer.from(
   "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mP8/x8AAusB9Y9ZQmcAAAAASUVORK5CYII=",
   "base64",
@@ -218,6 +220,12 @@ test.describe("CodeMirror workspace file editing", () => {
   });
 
   test("clicking the editor focuses its pane beside an agent", async ({ page }) => {
+    await page.addInitScript((settingsKey) => {
+      localStorage.setItem(
+        settingsKey,
+        JSON.stringify({ openInSidePane: { explorerFiles: true } }),
+      );
+    }, APP_SETTINGS_KEY);
     const target = "target.ts:42";
     const session = await seedAgentWithFileLink({
       target,

packages/app/e2e/browser/file-tree-rail-toggle.spec.ts

@@ -1,142 +0,0 @@
-// The file panel's tree rail had no way to close: the changes panel's toolbar
-// carries a folder-tree toggle, the file toolbar carried nothing, and the rail
-// was permanent on desktop.
-import { expect } from "@playwright/test";
-import { test } from "../support/fixtures";
-import { openFileExplorer, openFileFromExplorer } from "../support/helpers/file-explorer";
-import { gotoWorkspace } from "../support/helpers/launcher";
-import { seedWorkspace, type SeededWorkspace } from "../support/helpers/seed-client";
-
-let workspace: SeededWorkspace;
-
-async function effectiveBackground(locator: import("@playwright/test").Locator): Promise<string> {
-  return locator.evaluate((element) => {
-    let current: Element | null = element;
-    while (current) {
-      const color = getComputedStyle(current).backgroundColor;
-      if (color !== "rgba(0, 0, 0, 0)" && color !== "transparent") return color;
-      current = current.parentElement;
-    }
-    return "transparent";
-  });
-}
-
-test.beforeAll(async () => {
-  workspace = await seedWorkspace({
-    repoPrefix: "file-tree-rail-toggle-",
-    repo: { files: [{ path: "docs/guide.md", content: "# Guide\n" }] },
-  });
-});
-
-test.afterAll(async () => {
-  await workspace?.cleanup();
-});
-
-test.describe("File panel tree rail", () => {
-  test("the Files panel starts with an empty content pane beside the tree", async ({ page }) => {
-    await gotoWorkspace(page, workspace.workspaceId);
-    await openFileExplorer(page);
-
-    const rail = page.getByTestId("files-tree-rail").filter({ visible: true });
-    await expect(rail).toBeVisible({ timeout: 30_000 });
-    const content = rail.getByTestId("files-tree-rail-content");
-    const tree = rail.getByTestId("files-tree-rail-tree");
-    await expect(content).toHaveText("Choose a file");
-    await expect(tree).toContainText("docs");
-    expect(await effectiveBackground(tree.getByTestId("file-explorer-tree-scroll"))).toBe(
-      await effectiveBackground(content),
-    );
-  });
-
-  test("the file toolbar toggle closes and reopens the tree", async ({ page }, testInfo) => {
-    await gotoWorkspace(page, workspace.workspaceId);
-    await openFileExplorer(page);
-    await openFileFromExplorer(page, "docs");
-    await openFileFromExplorer(page, "guide.md");
-
-    const rail = page.getByTestId("file-tree-rail-tree").filter({ visible: true });
-    const toggle = page.getByTestId("file-toggle-tree").filter({ visible: true }).first();
-    const editorToolbar = page.getByTestId("file-panel-bar").filter({ visible: true });
-    const filesToolbar = page.getByTestId("files-pane-header").filter({ visible: true });
-    const refresh = page.getByRole("button", { name: "Refresh files" }).filter({ visible: true });
-    const hiddenFiles = page
-      .getByRole("button", { name: "Hide hidden files" })
-      .filter({ visible: true });
-    const shoot = async (name: string) => {
-      const path = testInfo.outputPath(`${name}.png`);
-      await page.screenshot({ path });
-      await testInfo.attach(name, { path, contentType: "image/png" });
-    };
-    await expect(rail).toBeVisible({ timeout: 30_000 });
-    await expect(toggle).toHaveAttribute("aria-selected", "true");
-    const [
-      editorToolbarBox,
-      filesToolbarBox,
-      treeToggleBox,
-      refreshBox,
-      treeGlyphBox,
-      refreshGlyphBox,
-    ] = await Promise.all([
-      editorToolbar.boundingBox(),
-      filesToolbar.boundingBox(),
-      toggle.boundingBox(),
-      refresh.boundingBox(),
-      toggle.locator("svg").boundingBox(),
-      refresh.locator("svg").boundingBox(),
-    ]);
-    if (
-      !editorToolbarBox ||
-      !filesToolbarBox ||
-      !treeToggleBox ||
-      !refreshBox ||
-      !treeGlyphBox ||
-      !refreshGlyphBox
-    ) {
-      throw new Error("Pane-content toolbar geometry could not be measured");
-    }
-    expect(editorToolbarBox.height).toBe(36);
-    expect(filesToolbarBox.height).toBe(36);
-    expect(editorToolbarBox.y + editorToolbarBox.height).toBe(
-      filesToolbarBox.y + filesToolbarBox.height,
-    );
-    expect(treeToggleBox.width).toBe(24);
-    expect(treeToggleBox.height).toBe(24);
-    expect(refreshBox.width).toBe(24);
-    expect(refreshBox.height).toBe(24);
-    expect(treeGlyphBox.width).toBe(14);
-    expect(treeGlyphBox.height).toBe(14);
-    expect(refreshGlyphBox.width).toBe(14);
-    expect(refreshGlyphBox.height).toBe(14);
-
-    const restBackground = await refresh.evaluate(
-      (element) => getComputedStyle(element).backgroundColor,
-    );
-    const treeToggleSelectedBackground = await toggle.evaluate(
-      (element) => getComputedStyle(element).backgroundColor,
-    );
-    await refresh.hover();
-    const refreshHoverBackground = await refresh.evaluate(
-      (element) => getComputedStyle(element).backgroundColor,
-    );
-    expect(refreshHoverBackground).not.toBe(restBackground);
-    expect(refreshHoverBackground).toBe(treeToggleSelectedBackground);
-    await hiddenFiles.click();
-    const hiddenFilesSelected = page
-      .getByRole("button", { name: "Show hidden files" })
-      .filter({ visible: true });
-    expect(
-      await hiddenFilesSelected.evaluate((element) => getComputedStyle(element).backgroundColor),
-    ).toBe(refreshHoverBackground);
-    await shoot("tree-open");
-
-    await toggle.click();
-    await expect(toggle).toHaveAttribute("aria-selected", "false");
-    await expect(rail).toHaveCount(0);
-    await shoot("tree-closed");
-
-    await toggle.click();
-    await expect(toggle).toHaveAttribute("aria-selected", "true");
-    await expect(rail).toBeVisible();
-    await shoot("tree-reopened");
-  });
-});

packages/app/e2e/browser/hidden-split-pane.spec.ts

@@ -1,60 +0,0 @@
-import { test, expect } from "../support/fixtures";
-import { gotoWorkspace } from "../support/helpers/launcher";
-import { seedWorkspace } from "../support/helpers/seed-client";
-import {
-  expectExplorerNodeRetained,
-  hideExplorerSplit,
-  measureExplorerSplit,
-  openExplorerSplit,
-  resizeExplorerSplit,
-  stampExplorerNode,
-} from "../support/helpers/split-pane";
-import {
-  createAgentTabFromMenu,
-  waitForWorkspaceTabsVisible,
-} from "../support/helpers/workspace-tabs";
-
-test.describe("Hidden split pane retention", () => {
-  test("releases all layout space without unmounting and restores its dragged width", async ({
-    page,
-  }, testInfo) => {
-    const workspace = await seedWorkspace({ repoPrefix: "hidden-split-pane-" });
-
-    try {
-      await gotoWorkspace(page, workspace.workspaceId);
-      await waitForWorkspaceTabsVisible(page);
-      await createAgentTabFromMenu(page);
-      await openExplorerSplit(page);
-
-      // Drag to a non-default width first: restoring the default would prove nothing.
-      await resizeExplorerSplit(page, 137);
-      await stampExplorerNode(page);
-      const open = await measureExplorerSplit(page);
-      expect(open.explorerWidth).toBeGreaterThan(250);
-      expect(open.separatorCount).toBe(1);
-
-      await hideExplorerSplit(page);
-      const hidden = await measureExplorerSplit(page);
-      expect(hidden.explorerWidth).toBe(0);
-      // The sibling must absorb the whole row, not just collapse the hidden pane.
-      expect(hidden.visibleWidth).toBeCloseTo(hidden.containerWidth, 5);
-      expect(hidden.occupiedWidth).toBeCloseTo(hidden.containerWidth, 5);
-      expect(hidden.separatorCount).toBe(0);
-      // Same DOM node, so a teardown-and-rebuild cannot pass as retention.
-      await expectExplorerNodeRetained(page);
-
-      await openExplorerSplit(page);
-      await expectExplorerNodeRetained(page);
-      const reopened = await measureExplorerSplit(page);
-      expect(reopened.explorerWidth).toBeCloseTo(open.explorerWidth, 5);
-      expect(reopened.separatorCount).toBe(1);
-
-      await testInfo.attach("split-pane-geometry", {
-        body: JSON.stringify({ open, hidden, reopened }, null, 2),
-        contentType: "application/json",
-      });
-    } finally {
-      await workspace.cleanup();
-    }
-  });
-});

packages/app/e2e/browser/launcher-tab.spec.ts

@@ -11,6 +11,7 @@ import {
   countTabsOfKind,
   waitForTabBar,
   pressNewTabShortcut,
+  pressDirectNewTabShortcut,
   getTabTestIds,
   waitForTabWithTitle,
   measureTileTransition,
@@ -177,13 +178,11 @@ test.describe("Tab creation", () => {
     const panel = page.getByTestId("workspace-new-tab-panel").filter({ visible: true });
     const agent = panel.getByRole("button", { name: /^Agent/ });
     const terminal = panel.getByRole("button", { name: /^Terminal/ });
-    const changes = panel.getByRole("button", { name: /Changes/ });
+    const diff = panel.getByRole("button", { name: /Diff/ });
-    const files = panel.getByRole("button", { name: /Files/ });
     const shortcutPrefix = process.platform === "darwin" ? /⇧⌘/ : /Ctrl.*Shift/;
     await expect(agent).toContainText(new RegExp(`${shortcutPrefix.source}.*A`));
     await expect(terminal).toContainText(new RegExp(`${shortcutPrefix.source}.*T`));
-    await expect(changes).toContainText(new RegExp(`${shortcutPrefix.source}.*G`));
+    await expect(diff).toContainText(new RegExp(`${shortcutPrefix.source}.*G`));
-    await expect(files).toContainText(new RegExp(`${shortcutPrefix.source}.*E`));
     await expect(agent).toBeFocused();
 
     await page.keyboard.press("ArrowDown");
@@ -191,6 +190,12 @@ test.describe("Tab creation", () => {
     await page.keyboard.press("ArrowUp");
     await expect(agent).toBeFocused();
 
+    await pressDirectNewTabShortcut(page, "e");
+    await expect(page.getByTestId("workspace-explorer-sidebar")).toBeVisible();
+    await expect(
+      page.getByTestId("file-explorer-tree-scroll").filter({ visible: true }),
+    ).toBeVisible();
+
     await page.locator("body").click({ position: { x: 1, y: 1 } });
     await panel.click({ position: { x: 20, y: 20 } });
     await expect(agent).toBeFocused();

packages/app/e2e/browser/new-workspace-launch-memory.spec.ts

@@ -64,6 +64,7 @@ test.describe("New workspace: launch target memory", () => {
     await test.step("launching a terminal profile preselects it the next time New workspace opens", async () => {
       await openNewWorkspace();
       await selectLaunchOption(page, PROMPT_PROFILE.id);
+      await expectTerminalLaunchSelected(page, PROMPT_PROFILE.name);
       await fillTerminalPrompt(page, "remember me");
       await submitTerminalLaunch(page);
       await expectWorkspaceOpensWithTerminalTab(page);
@@ -88,6 +89,7 @@ test.describe("New workspace: launch target memory", () => {
 
     await test.step("re-selecting the terminal profile, then removing it daemon-side, falls back to Chat rather than a dead entry", async () => {
       await selectLaunchOption(page, PROMPT_PROFILE.id);
+      await expectTerminalLaunchSelected(page, PROMPT_PROFILE.name);
       await fillTerminalPrompt(page, "second run");
       await submitTerminalLaunch(page);
       await expectWorkspaceOpensWithTerminalTab(page);

packages/app/e2e/browser/rewind-menu.ui-contract.spec.ts

@@ -153,6 +153,7 @@ test.describe("Rewind sheet", () => {
       repoPrefix: "rewind-e2e-",
       title: "Rewind e2e",
       initialPrompt: firstPrompt,
+      model: "ten-second-stream",
     });
 
     try {

packages/app/e2e/browser/sessions-search.spec.ts

@@ -70,73 +70,55 @@ test.describe("History search", () => {
     await tempRepo?.cleanup();
   });
 
-  test("typing narrows history to matching sessions and clearing restores them", async ({
+  test("searches, ranks, highlights, and clears session history", async ({ page }) => {
-    page,
-  }) => {
     await resetSeededPageState(page);
     await openSessions(page);
 
-    // Seeded newest-first, and at rest history is chronological.
+    await test.step("narrows history and restores chronological grouping", async () => {
-    await expectVisibleTitles(page, [TITLES.billing, TITLES.unbilled, TITLES.terminal]);
+      await expectVisibleTitles(page, [TITLES.billing, TITLES.unbilled, TITLES.terminal]);
-    await expect(page.getByText("Today", { exact: true })).toHaveCount(1, { timeout: 30_000 });
+      await expect(page.getByText("Today", { exact: true })).toHaveCount(1, {
+        timeout: 30_000,
+      });
 
-    await search(page, `${NONCE} billing`);
+      await search(page, `${NONCE} billing`);
-    await expectVisibleTitles(page, [TITLES.billing]);
+      await expectVisibleTitles(page, [TITLES.billing]);
+      await expect(page.getByText("Today", { exact: true })).toHaveCount(0, {
+        timeout: 30_000,
+      });
 
-    // Ranked results are one flat list — a day heading would claim an order
+      await page.getByTestId("sessions-search-clear").click();
-    // the list no longer has.
+      await expect(page.getByTestId("sessions-search-input")).toHaveValue("");
-    await expect(page.getByText("Today", { exact: true })).toHaveCount(0, { timeout: 30_000 });
+      await expectVisibleTitles(page, [TITLES.billing, TITLES.unbilled, TITLES.terminal]);
+      await expect(page.getByText("Today", { exact: true })).toHaveCount(1, {
+        timeout: 30_000,
+      });
+    });
 
-    await page.getByTestId("sessions-search-clear").click();
+    await test.step("ranks whole-word matches above substrings", async () => {
-    await expect(page.getByTestId("sessions-search-input")).toHaveValue("");
+      await search(page, `${NONCE} bill`);
-    await expectVisibleTitles(page, [TITLES.billing, TITLES.unbilled, TITLES.terminal]);
+      await expectVisibleTitles(page, [TITLES.billing, TITLES.unbilled]);
-    await expect(page.getByText("Today", { exact: true })).toHaveCount(1, { timeout: 30_000 });
+    });
-  });
 
-  test("ranks a whole-word hit above one buried inside a word", async ({ page }) => {
+    await test.step("highlights exact and typo-resolved matches", async () => {
-    await resetSeededPageState(page);
+      await search(page, `${NONCE} billing`);
-    await openSessions(page);
+      const row = page.locator(AGENT_ROW).filter({ hasText: NONCE }).first();
+      await expect(row.getByText("billing", { exact: true })).toBeVisible({ timeout: 30_000 });
 
-    // "bill" starts a word in "billing" and hides inside "unbilled", so the
+      await search(page, `${NONCE} bulling`);
-    // stronger match leads even though both sessions are equally recent.
+      await expectVisibleTitles(page, [TITLES.billing]);
-    await search(page, `${NONCE} bill`);
+      const typoRow = page.locator(AGENT_ROW).filter({ hasText: NONCE }).first();
-    await expectVisibleTitles(page, [TITLES.billing, TITLES.unbilled]);
+      await expect(typoRow.getByText("billing", { exact: true })).toBeVisible({
-  });
+        timeout: 30_000,
+      });
+    });
 
-  test("marks the characters each result matched on", async ({ page }) => {
+    await test.step("distinguishes no matches from empty history", async () => {
-    await resetSeededPageState(page);
+      await search(page, `${NONCE} kubernetes`);
-    await openSessions(page);
+      await expect(page.getByTestId("sessions-empty")).toBeVisible({ timeout: 30_000 });
+      await expect(page.getByText("No sessions match")).toBeVisible({ timeout: 30_000 });
 
-    // The mark is a nested Text run, so the matched slice is its own element.
+      await page.getByText("Clear search").click();
-    await search(page, `${NONCE} billing`);
+      await expectVisibleTitles(page, [TITLES.billing, TITLES.unbilled, TITLES.terminal]);
-    const row = page.locator(AGENT_ROW).filter({ hasText: NONCE }).first();
+    });
-    await expect(row).toBeVisible({ timeout: 30_000 });
-    await expect(row.getByText("billing", { exact: true })).toBeVisible({ timeout: 30_000 });
-
-    // A typo has no characters in the text to point at, so the whole word it
-    // resolved to is marked.
-    await search(page, `${NONCE} bulling`);
-    const typoRow = page.locator(AGENT_ROW).filter({ hasText: NONCE }).first();
-    await expect(typoRow.getByText("billing", { exact: true })).toBeVisible({ timeout: 30_000 });
-  });
-
-  test("finds a session through a typo", async ({ page }) => {
-    await resetSeededPageState(page);
-    await openSessions(page);
-
-    await search(page, `${NONCE} bulling`);
-    await expectVisibleTitles(page, [TITLES.billing]);
-  });
-
-  test("says the query found nothing, not that history is empty", async ({ page }) => {
-    await resetSeededPageState(page);
-    await openSessions(page);
-
-    await search(page, `${NONCE} kubernetes`);
-    await expect(page.getByTestId("sessions-empty")).toBeVisible({ timeout: 30_000 });
-    await expect(page.getByText("No sessions match")).toBeVisible({ timeout: 30_000 });
-
-    await page.getByText("Clear search").click();
-    await expectVisibleTitles(page, [TITLES.billing, TITLES.unbilled, TITLES.terminal]);
   });
 });

packages/app/e2e/browser/settings-navigation.spec.ts

@@ -121,6 +121,41 @@ test.describe("Settings sidebar navigation", () => {
     await clickSettingsBackToWorkspace(page);
     await expect(page).not.toHaveURL(/\/settings(\/|$)/);
   });
+
+  test("pressing Escape closes settings", async ({ page }) => {
+    await gotoAppShell(page);
+    await openSettings(page);
+    await page.keyboard.press("Escape");
+    await expect(page).not.toHaveURL(/\/settings(\/|$)/);
+  });
+
+  test("Escape lets settings dropdowns and modals close before leaving settings", async ({
+    page,
+  }) => {
+    await gotoAppShell(page);
+    await openSettings(page);
+
+    await test.step("a dropdown owns Escape", async () => {
+      await openSettingsSection(page, "appearance");
+      await page.getByLabel(/Theme:/).click();
+      await expect(page.getByRole("menuitem", { name: "System", exact: true })).toBeVisible();
+
+      await page.keyboard.press("Escape");
+
+      await expect(page.getByRole("menuitem", { name: "System", exact: true })).toHaveCount(0);
+      await expect(page).toHaveURL(/\/settings(\/|$)/);
+    });
+
+    await test.step("a modal owns Escape", async () => {
+      await openAddHostFlow(page);
+      await expect(page.getByText("Add connection", { exact: true })).toBeVisible();
+
+      await page.keyboard.press("Escape");
+
+      await expect(page.getByText("Add connection", { exact: true })).toHaveCount(0);
+      await expect(page).toHaveURL(/\/settings(\/|$)/);
+    });
+  });
 });
 
 test.describe("Settings — compact master-detail", () => {

packages/app/e2e/browser/side-panel.spec.ts

@@ -1,238 +0,0 @@
-import { expect, type Locator, type Page, type TestInfo } from "@playwright/test";
-import { test } from "../support/fixtures";
-import { gotoWorkspace } from "../support/helpers/launcher";
-import { seedWorkspace } from "../support/helpers/seed-client";
-import { ensureSidePanel, waitForWorkspaceTabsVisible } from "../support/helpers/workspace-tabs";
-
-async function capture(page: Page, testInfo: TestInfo, name: string): Promise<void> {
-  const path = testInfo.outputPath(`${name}.png`);
-  await page.screenshot({ path });
-  await testInfo.attach(name, { path, contentType: "image/png" });
-}
-
-function sidePanel(page: Page): Locator {
-  return page.getByTestId("workspace-side-panel").filter({ visible: true });
-}
-
-function mainPane(page: Page): Locator {
-  return page.getByTestId("workspace-pane-main").filter({ visible: true });
-}
-
-function newTabPanel(scope: Locator): Locator {
-  return scope.getByTestId("workspace-new-tab-panel");
-}
-
-async function launcherButtonLabels(launcher: Locator): Promise<(string | null)[]> {
-  return launcher
-    .getByRole("button")
-    .evaluateAll((buttons) => buttons.map((button) => button.getAttribute("aria-label")));
-}
-
-function sidePanelToggle(page: Page): Locator {
-  return page.getByTestId("workspace-explorer-toggle").first();
-}
-
-/** Drags the pane's only tab into the left edge of its own pane, splitting it out. */
-async function splitTabOutOfMainPane(page: Page, chip: Locator): Promise<void> {
-  const paneBox = await mainPane(page).boundingBox();
-  const chipBox = await chip.boundingBox();
-  expect(paneBox).not.toBeNull();
-  expect(chipBox).not.toBeNull();
-  if (!paneBox || !chipBox) throw new Error("Unable to measure the main pane");
-
-  await page.mouse.move(chipBox.x + chipBox.width / 2, chipBox.y + chipBox.height / 2);
-  await page.mouse.down();
-  await page.mouse.move(chipBox.x + chipBox.width / 2 + 12, chipBox.y + chipBox.height / 2 + 4);
-  await page.mouse.move(paneBox.x + paneBox.width * 0.06, paneBox.y + paneBox.height * 0.6, {
-    steps: 20,
-  });
-  await page.mouse.up();
-}
-
-test.describe("Side panel", () => {
-  test("reveals empty, launches a view, and hides back out of the way", async ({
-    page,
-  }, testInfo) => {
-    const workspace = await seedWorkspace({ repoPrefix: "side-panel-reveal-" });
-
-    try {
-      await gotoWorkspace(page, workspace.workspaceId);
-      await waitForWorkspaceTabsVisible(page);
-      await expect(sidePanel(page)).toHaveCount(0);
-
-      await test.step("revealing the Side panel seeds nothing", async () => {
-        await sidePanelToggle(page).click();
-        await expect(sidePanel(page)).toBeVisible({ timeout: 30_000 });
-        const launcher = newTabPanel(sidePanel(page));
-        await expect(launcher).toBeVisible();
-        expect((await launcherButtonLabels(launcher)).slice(0, 4)).toEqual([
-          "Changes",
-          "Files",
-          "Terminal",
-          "Agent",
-        ]);
-        await expect(page.getByTestId("workspace-tab-working_diff")).toHaveCount(0);
-        await capture(page, testInfo, "01-side-panel-reveals-empty");
-      });
-
-      await test.step("Changes opens in the Side panel that offered it", async () => {
-        await newTabPanel(sidePanel(page)).getByRole("button", { name: "Changes" }).click();
-        await expect(sidePanel(page).getByTestId("workspace-tab-working_diff")).toBeVisible({
-          timeout: 30_000,
-        });
-        await expect(page.getByTestId("working-diff-panel").filter({ visible: true })).toBeVisible({
-          timeout: 30_000,
-        });
-        await capture(page, testInfo, "02-changes-opens-in-side-panel");
-      });
-
-      await test.step("closing its final tab hides the Side panel, and it reopens empty", async () => {
-        const changesTab = sidePanel(page).getByTestId("workspace-tab-working_diff");
-        await changesTab.hover();
-        await page
-          .locator('[data-testid^="workspace-working-diff-close-"]')
-          .filter({ visible: true })
-          .click();
-        await expect(sidePanel(page)).toHaveCount(0, { timeout: 15_000 });
-        await capture(page, testInfo, "03-side-panel-hidden-after-final-tab-close");
-
-        await sidePanelToggle(page).click();
-        await expect(sidePanel(page)).toBeVisible({ timeout: 15_000 });
-        await expect(newTabPanel(sidePanel(page))).toBeVisible();
-        await capture(page, testInfo, "04-side-panel-revealed-empty");
-      });
-    } finally {
-      await workspace.cleanup();
-    }
-  });
-
-  test("an emptied ordinary pane is removed rather than hidden", async ({ page }, testInfo) => {
-    const workspace = await seedWorkspace({ repoPrefix: "side-panel-close-main-" });
-
-    try {
-      await gotoWorkspace(page, workspace.workspaceId);
-      await waitForWorkspaceTabsVisible(page);
-      await ensureSidePanel(page);
-
-      // Dragging the pane's only tab into its own left edge splits that tab into a
-      // new pane and leaves the one it came from empty.
-      const draftTab = page
-        .locator('[data-testid^="workspace-tab-draft_"]')
-        .filter({ visible: true })
-        .first();
-      await expect(draftTab).toBeVisible({ timeout: 30_000 });
-      await splitTabOutOfMainPane(page, draftTab);
-      const draftPane = page
-        .locator('[data-testid^="workspace-pane-pane_"]')
-        .filter({ visible: true })
-        .first();
-      await expect(draftPane).toBeVisible({ timeout: 15_000 });
-
-      const emptyMain = newTabPanel(mainPane(page));
-      await expect(emptyMain).toBeVisible({ timeout: 15_000 });
-      await capture(page, testInfo, "06-empty-main-pane-launcher");
-
-      const newTabChip = mainPane(page)
-        .locator('[data-testid^="workspace-tab-tab_"]')
-        .filter({ hasText: "New tab" });
-      await newTabChip.hover();
-      await mainPane(page)
-        .locator('[data-testid^="workspace-new-tab-close-"]')
-        .filter({ visible: true })
-        .click();
-
-      // Gone for good, unlike the Side panel beside it, which is still only hidden away.
-      await expect(mainPane(page)).toHaveCount(0, { timeout: 30_000 });
-      await expect(sidePanel(page)).toBeVisible();
-      await expect(draftPane.getByTestId("workspace-new-tab-panel")).toHaveCount(0);
-      await capture(page, testInfo, "07-empty-main-pane-removed");
-    } finally {
-      await workspace.cleanup();
-    }
-  });
-
-  test("closing New cannot remove the last visible pane", async ({ page }, testInfo) => {
-    const workspace = await seedWorkspace({ repoPrefix: "side-panel-final-pane-" });
-
-    try {
-      await gotoWorkspace(page, workspace.workspaceId);
-      await waitForWorkspaceTabsVisible(page);
-
-      // Park a tab in the Side panel, then put the panel away. The workspace still
-      // holds that tab, so emptying Main does not look like an empty workspace and
-      // nothing reseeds a draft into it.
-      await ensureSidePanel(page);
-      await newTabPanel(sidePanel(page))
-        .getByRole("button", { name: "Files", exact: true })
-        .click();
-      await expect(sidePanel(page).getByTestId("workspace-tab-files")).toBeVisible({
-        timeout: 30_000,
-      });
-      await sidePanelToggle(page).click();
-      await expect(sidePanel(page)).toHaveCount(0, { timeout: 15_000 });
-
-      const draftTab = page
-        .locator('[data-testid^="workspace-tab-draft_"]')
-        .filter({ visible: true })
-        .first();
-      await draftTab.hover();
-      await page
-        .locator('[data-testid^="workspace-draft-close-"]')
-        .filter({ visible: true })
-        .first()
-        .click();
-
-      // Main now contains New and is the only pane the user can see. Closing its
-      // tab cannot remove the final visible pane.
-      const lastPane = newTabPanel(mainPane(page));
-      await expect(lastPane).toBeVisible({ timeout: 15_000 });
-      await expect(lastPane.getByRole("button", { name: "Files", exact: true })).toBeVisible();
-      const finalNewTab = mainPane(page)
-        .locator('[data-testid^="workspace-tab-tab_"]')
-        .filter({ hasText: "New tab" });
-      await finalNewTab.hover();
-      await mainPane(page)
-        .locator('[data-testid^="workspace-new-tab-close-"]')
-        .filter({ visible: true })
-        .click();
-      await expect(lastPane).toBeVisible();
-      await capture(page, testInfo, "08-final-visible-pane-has-no-close");
-    } finally {
-      await workspace.cleanup();
-    }
-  });
-
-  test("a pane's own menu creates an independent view when one is open elsewhere", async ({
-    page,
-  }, testInfo) => {
-    const workspace = await seedWorkspace({ repoPrefix: "side-panel-claim-" });
-
-    try {
-      await gotoWorkspace(page, workspace.workspaceId);
-      await waitForWorkspaceTabsVisible(page);
-      await ensureSidePanel(page);
-      await newTabPanel(sidePanel(page)).getByRole("button", { name: "Changes" }).click();
-      await expect(sidePanel(page).getByTestId("workspace-tab-working_diff")).toBeVisible({
-        timeout: 30_000,
-      });
-      await capture(page, testInfo, "08-changes-in-side-panel");
-
-      await mainPane(page).getByTestId("workspace-new-tab-button").click();
-      await page
-        .getByTestId("workspace-new-tab-menu-changes")
-        .filter({ visible: true })
-        .first()
-        .click();
-
-      await expect(mainPane(page).getByTestId("workspace-tab-working_diff")).toBeVisible({
-        timeout: 15_000,
-      });
-      await expect(sidePanel(page).getByTestId("workspace-tab-working_diff")).toHaveCount(1);
-      await expect(mainPane(page).getByTestId("workspace-tab-working_diff")).toHaveCount(1);
-      await expect(page.getByTestId("workspace-tab-working_diff")).toHaveCount(2);
-      await capture(page, testInfo, "09-independent-changes-in-both-panes");
-    } finally {
-      await workspace.cleanup();
-    }
-  });
-});

packages/app/e2e/browser/sidebar-help.spec.ts

@@ -41,46 +41,37 @@ async function expectExternalPage(
   await popup.close();
 }
 
-test("opens troubleshooting tools from the sidebar help menu", async ({ page }) => {
+test("opens troubleshooting, support, and release destinations", async ({ page }) => {
   await gotoAppShell(page);
   await expect(page.getByTestId("sidebar-help")).toBeVisible();
 
-  await openHelpMenu(page);
+  await test.step("opens diagnostics and keyboard shortcuts", async () => {
-  const triggerBox = await page.getByTestId("sidebar-help").evaluate((element) => {
+    await openHelpMenu(page);
-    const { y, height } = element.getBoundingClientRect();
+    await expect(page.getByText("Help", { exact: true })).toBeVisible();
-    return { y, height };
+    await expect(page.getByText("Report an issue", { exact: true })).toBeVisible();
+    await expect(page.getByText("What's new", { exact: true })).toBeVisible();
+    await expect(page.getByTestId("sidebar-help-version")).toHaveText(APP_VERSION);
+
+    await page.getByTestId("sidebar-help-diagnostics").click();
+    await expectDiagnosticReport(page);
+    await closeSheet(page, "app-diagnostic-sheet");
+
+    await openHelpMenu(page);
+    await page.getByTestId("sidebar-help-shortcuts").click();
+    await expect(page.getByTestId("keyboard-shortcuts-dialog")).toBeVisible();
+    await closeSheet(page, "keyboard-shortcuts-dialog");
   });
-  const menuBox = await page.getByTestId("sidebar-help-menu").evaluate((element) => {
+
-    const { y, height } = element.getBoundingClientRect();
+  await test.step("opens support and release pages", async () => {
-    return { y, height };
+    await openHelpMenu(page);
+    await expectExternalPage(page, "sidebar-help-discord", DISCORD_DESTINATION);
+
+    await openHelpMenu(page);
+    await expectExternalPage(page, "sidebar-help-github", GITHUB_ISSUE_DESTINATION);
+
+    await openHelpMenu(page);
+    await expectExternalPage(page, "sidebar-help-changelog", CHANGELOG_DESTINATION);
   });
-  expect(menuBox.y + menuBox.height).toBeLessThanOrEqual(triggerBox.y);
-  await expect(page.getByText("Help", { exact: true })).toBeVisible();
-  await expect(page.getByText("Report an issue", { exact: true })).toBeVisible();
-  await expect(page.getByText("What's new", { exact: true })).toBeVisible();
-  await expect(page.getByTestId("sidebar-help-version")).toHaveText(APP_VERSION);
-
-  await page.getByTestId("sidebar-help-diagnostics").click();
-  await expectDiagnosticReport(page);
-  await closeSheet(page, "app-diagnostic-sheet");
-
-  await openHelpMenu(page);
-  await page.getByTestId("sidebar-help-shortcuts").click();
-  await expect(page.getByTestId("keyboard-shortcuts-dialog")).toBeVisible();
-  await closeSheet(page, "keyboard-shortcuts-dialog");
-});
-
-test("opens support and release destinations", async ({ page }) => {
-  await gotoAppShell(page);
-
-  await openHelpMenu(page);
-  await expectExternalPage(page, "sidebar-help-discord", DISCORD_DESTINATION);
-
-  await openHelpMenu(page);
-  await expectExternalPage(page, "sidebar-help-github", GITHUB_ISSUE_DESTINATION);
-
-  await openHelpMenu(page);
-  await expectExternalPage(page, "sidebar-help-changelog", CHANGELOG_DESTINATION);
 });
 
 test("searches keyboard shortcuts from the sidebar help menu", async ({ page }) => {

packages/app/e2e/browser/sidebar-resize-handle.spec.ts

@@ -1,39 +0,0 @@
-import type { Locator } from "@playwright/test";
-import { expect, test, type Page } from "../support/fixtures";
-
-test.use({ viewport: { width: 1600, height: 900 } });
-
-async function expectBorderHighlight(
-  page: Page,
-  testID: string,
-  hoverTarget: Locator,
-  expectedWidth: string,
-) {
-  const handle = page.getByTestId(testID);
-  await expect(handle).toBeVisible();
-  await expect(page.getByTestId(`${testID}-highlight`)).toHaveCount(0);
-
-  await hoverTarget.hover();
-
-  const highlight = page.getByTestId(`${testID}-highlight`);
-  await expect(highlight).toBeVisible();
-  await expect(highlight).toHaveCSS("width", expectedWidth);
-  await expect(highlight).not.toHaveCSS("background-color", "rgba(0, 0, 0, 0)");
-}
-
-test("sidebar and workspace pane borders highlight on hover", async ({ page, withWorkspace }) => {
-  const workspace = await withWorkspace({ prefix: "sidebar-resize-handle-" });
-  await workspace.navigateTo();
-
-  const sidebarHandle = page.getByTestId("left-sidebar-resize-handle");
-  await expectBorderHighlight(page, "left-sidebar-resize-handle", sidebarHandle, "1px");
-
-  await page.getByTestId("workspace-explorer-toggle").first().click();
-  const splitHandle = page.getByTestId("workspace-split-resize-handle");
-  await expectBorderHighlight(
-    page,
-    "workspace-split-resize-handle",
-    splitHandle.getByRole("separator"),
-    "3px",
-  );
-});

packages/app/e2e/browser/sidebar-workspace-pin-shortcut.spec.ts

@@ -146,20 +146,37 @@ async function installPinRpcGate(
 }
 
 test.describe("Pin workspace shortcut", () => {
-  test("keeps project creation reachable after pinning its only workspace", async ({ page }) => {
+  test("dispatches pin once and keeps project creation reachable", async ({ page }) => {
     const workspace = await seedWorkspace({
       repoPrefix: "pin-project-creation-",
       title: "Pinned workspace",
     });
 
     try {
+      const gate = await installPinRpcGate(page);
+
       await gotoAppShell(page);
       await openWorkspace(page, workspace.workspaceId);
-      await page.keyboard.press(PIN_SHORTCUT);
-      await expect(pinnedSection(page)).toBeVisible({ timeout: 10_000 });
 
-      await openNewWorkspaceComposer(page, workspace);
+      await test.step("sends one RPC for each pin transition", async () => {
-      await expectNewWorkspaceProjectSelected(page, workspace.projectDisplayName);
+        await page.keyboard.press(PIN_SHORTCUT);
+        await expect(pinnedSection(page)).toBeVisible({ timeout: 10_000 });
+        expect(gate.sentCount()).toBe(1);
+
+        await page.keyboard.press(PIN_SHORTCUT);
+        await expect(pinnedSection(page)).toHaveCount(0, { timeout: 10_000 });
+        expect(gate.sentCount()).toBe(2);
+        await expect(workspaceRow(page, workspace.workspaceId)).toHaveCount(1);
+      });
+
+      await test.step("keeps the pinned project available to workspace creation", async () => {
+        await page.keyboard.press(PIN_SHORTCUT);
+        await expect(pinnedSection(page)).toBeVisible({ timeout: 10_000 });
+        expect(gate.sentCount()).toBe(3);
+
+        await openNewWorkspaceComposer(page, workspace);
+        await expectNewWorkspaceProjectSelected(page, workspace.projectDisplayName);
+      });
     } finally {
       await workspace.cleanup();
     }
@@ -207,34 +224,6 @@ test.describe("Pin workspace shortcut", () => {
     }
   });
 
-  test("sends exactly one pin RPC per press when the row is rendered and selected", async ({
-    page,
-  }) => {
-    const workspace = await seedWorkspace({ repoPrefix: "pin-shortcut-expanded-" });
-
-    try {
-      const gate = await installPinRpcGate(page);
-
-      await gotoAppShell(page);
-      await openWorkspace(page, workspace.workspaceId);
-
-      await page.keyboard.press(PIN_SHORTCUT);
-      await expect(pinnedSection(page)).toBeVisible({ timeout: 10_000 });
-      // Counting frames catches a press that produces zero or two RPCs — a misfiring in-flight
-      // guard, or a second dispatch path. It cannot detect a duplicate handler registration:
-      // `keyboardActionDispatcher.dispatch` returns at the first handler that returns true, so a
-      // shadowed second handler is unobservable from outside by design.
-      expect(gate.sentCount()).toBe(1);
-
-      await page.keyboard.press(PIN_SHORTCUT);
-      await expect(pinnedSection(page)).toHaveCount(0, { timeout: 10_000 });
-      expect(gate.sentCount()).toBe(2);
-      await expect(workspaceRow(page, workspace.workspaceId)).toHaveCount(1);
-    } finally {
-      await workspace.cleanup();
-    }
-  });
-
   test("pins the active workspace while its status group is collapsed", async ({ page }) => {
     const workspace = await seedWorkspace({ repoPrefix: "pin-shortcut-status-" });
 

packages/app/e2e/browser/sidebar-workspace.spec.ts

@@ -118,19 +118,6 @@ test.describe("Sidebar workspace list", () => {
     }
   });
 
-  test("project shows workspace under it", async ({ page }) => {
-    const workspace = await seedWorkspace({ repoPrefix: "sidebar-workspace-under-project-" });
-
-    try {
-      await gotoAppShell(page);
-
-      await waitForSidebarProject(page, path.basename(workspace.repoPath));
-      await waitForSidebarWorkspace(page, workspace.workspaceId);
-    } finally {
-      await workspace.cleanup();
-    }
-  });
-
   test("non-git project shows directory name", async ({ page }) => {
     const workspace = await seedWorkspace({ repoPrefix: "sidebar-directory-", git: false });
 
@@ -319,7 +306,7 @@ test.describe("Half-screen desktop layout", () => {
     await expect(closedIcon).toBeVisible();
     const closedBounds = await closedIcon.boundingBox();
     expect(closedBounds).not.toBeNull();
-    expect(closedBounds?.x).toBeCloseTo(12, 0);
+    expect(closedBounds?.x).toBeCloseTo(9, 0);
     expect(closedBounds?.y).toBe(openBounds?.y);
   });
 
@@ -342,16 +329,19 @@ test.describe("Half-screen desktop layout", () => {
 
       await openFilesPanel(page);
       const explorerToggle = page.getByTestId("workspace-explorer-toggle").first();
-      await expect(page.getByTestId("workspace-tab-files").filter({ visible: true })).toBeVisible();
+      await expect(
-      await expect(explorerToggle).toHaveAccessibleName("Close side panel");
+        page.getByTestId("explorer-sidebar-tab-files").filter({ visible: true }),
+      ).toBeVisible();
+      await expect(explorerToggle).toHaveAccessibleName("Close Explorer sidebar");
       await expect(page.getByTestId("sidebar-global-new-workspace")).toBeVisible();
-      await expect(page.getByTestId("workspace-tabs-row").filter({ visible: true })).toHaveCount(2);
+      await expect(page.getByTestId("explorer-sidebar-tab-rail")).toBeVisible();
+      await expect(page.getByTestId("workspace-tabs-row").filter({ visible: true })).toHaveCount(1);
 
       await explorerToggle.click();
-      await expect(page.getByTestId("workspace-tab-files").filter({ visible: true })).toHaveCount(
+      await expect(
-        0,
+        page.getByTestId("explorer-sidebar-tab-files").filter({ visible: true }),
-      );
+      ).toHaveCount(0);
-      await expect(explorerToggle).toHaveAccessibleName("Open side panel");
+      await expect(explorerToggle).toHaveAccessibleName("Open Explorer sidebar");
       await expect(page.getByTestId("sidebar-global-new-workspace")).toBeVisible();
     } finally {
       await workspace.cleanup();

packages/app/e2e/browser/workspace-lifecycle.spec.ts

@@ -11,35 +11,37 @@ test.describe("Workspace lifecycle", () => {
   // One retry is enough for the daemon to stabilize.
   test.describe.configure({ retries: 1 });
 
-  test.describe("Main checkout", () => {
+  test("main checkout creates an agent chat and terminal in the project root", async ({
-    test("creates an agent chat via New Chat", async ({ page, withWorkspace }) => {
+    page,
-      test.setTimeout(60_000);
+    withWorkspace,
-      const workspace = await withWorkspace({ prefix: "lifecycle-main-chat-" });
+  }) => {
-      await workspace.navigateTo();
+    test.setTimeout(60_000);
+    const workspace = await withWorkspace({ prefix: "lifecycle-main-" });
+    await workspace.navigateTo();
+
+    await test.step("creates an agent chat", async () => {
       await createAgentChatFromLauncher(page);
     });
 
-    test("creates a terminal with correct CWD", async ({ page, withWorkspace }) => {
+    await test.step("creates a terminal in the project root", async () => {
-      test.setTimeout(60_000);
-      const workspace = await withWorkspace({ prefix: "lifecycle-main-shell-" });
-      await workspace.navigateTo();
       await createStandaloneTerminalFromLauncher(page);
       await expectTerminalCwd(page, workspace.repoPath);
     });
   });
 
-  test.describe("Worktree workspace", () => {
+  test("worktree creates an agent chat and terminal in its directory", async ({
-    test("creates an agent chat via New Chat", async ({ page, withWorkspace }) => {
+    page,
-      test.setTimeout(90_000);
+    withWorkspace,
-      const workspace = await withWorkspace({ worktree: true, prefix: "lifecycle-wt-chat-" });
+  }) => {
-      await workspace.navigateTo();
+    test.setTimeout(90_000);
+    const workspace = await withWorkspace({ worktree: true, prefix: "lifecycle-wt-" });
+    await workspace.navigateTo();
+
+    await test.step("creates an agent chat", async () => {
       await createAgentChatFromLauncher(page);
     });
 
-    test("creates a terminal with correct CWD", async ({ page, withWorkspace }) => {
+    await test.step("creates a terminal in the worktree", async () => {
-      test.setTimeout(90_000);
-      const workspace = await withWorkspace({ worktree: true, prefix: "lifecycle-wt-shell-" });
-      await workspace.navigateTo();
       await createStandaloneTerminalFromLauncher(page);
       await expectTerminalCwd(page, workspace.repoPath);
     });

packages/app/e2e/browser/workspace-model-restart.spec.ts

@@ -1,6 +1,5 @@
 import { randomUUID } from "node:crypto";
-import { execSync, spawn, type ChildProcess } from "node:child_process";
+import type { ChildProcess } from "node:child_process";
-import { once } from "node:events";
 import { mkdirSync, mkdtempSync, readFileSync, rmSync, writeFileSync } from "node:fs";
 import { tmpdir } from "node:os";
 import path from "node:path";
@@ -23,6 +22,7 @@ import {
   submitNewWorkspaceEmpty,
 } from "../support/helpers/new-workspace";
 import { selectSidebarStatusGrouping } from "../support/helpers/sidebar";
+import { killProcessTree, spawnTsx } from "../support/helpers/spawn-node";
 import { waitForSidebarHydration } from "../support/helpers/workspace-ui";
 import { getVisibleWorkspaceAgentTabIds } from "../support/helpers/workspace-tabs";
 
@@ -195,9 +195,11 @@ async function getAvailablePort(): Promise<number> {
 async function waitForServer(port: number, child: ChildProcess): Promise<void> {
   const startedAt = Date.now();
   let lastConnectionError: unknown = null;
-  while (Date.now() - startedAt < 20_000) {
+  while (Date.now() - startedAt < 90_000) {
-    if (child.exitCode !== null) {
+    if (child.exitCode !== null || child.signalCode !== null) {
-      throw new Error(`Restart test daemon exited before listening (exit ${child.exitCode}).`);
+      throw new Error(
+        `Restart test daemon exited before listening (code ${String(child.exitCode)}, signal ${String(child.signalCode)}).`,
+      );
     }
     try {
       await new Promise<void>((resolve, reject) => {
@@ -226,21 +228,6 @@ async function waitForServer(port: number, child: ChildProcess): Promise<void> {
   );
 }
 
-async function stopProcess(child: ChildProcess): Promise<void> {
-  if (child.exitCode !== null || child.signalCode !== null) return;
-  child.kill("SIGTERM");
-  const timeout = setTimeout(() => {
-    if (child.exitCode === null && child.signalCode === null) {
-      child.kill("SIGKILL");
-    }
-  }, 5000);
-  try {
-    await once(child, "exit");
-  } finally {
-    clearTimeout(timeout);
-  }
-}
-
 async function startRestartDaemon(input: {
   paseoHome: string;
   origin: string;
@@ -251,8 +238,7 @@ async function startRestartDaemon(input: {
   }
 
   const serverDir = path.resolve(__dirname, "../../../server");
-  const tsxBin = execSync("which tsx").toString().trim();
+  const child = spawnTsx("scripts/supervisor-entrypoint.ts", ["--dev"], {
-  const child = spawn(tsxBin, ["scripts/supervisor-entrypoint.ts", "--dev"], {
     cwd: serverDir,
     env: withDisabledE2ESpeechEnv({
       ...process.env,
@@ -276,7 +262,7 @@ async function startRestartDaemon(input: {
   try {
     await waitForServer(port, child);
   } catch (error) {
-    await stopProcess(child);
+    await killProcessTree(child);
     throw new Error(
       `${error instanceof Error ? error.message : String(error)}\nDaemon stderr:\n${stderr}`,
       { cause: error },
@@ -285,7 +271,7 @@ async function startRestartDaemon(input: {
 
   return {
     port,
-    close: () => stopProcess(child),
+    close: () => killProcessTree(child),
   };
 }
 
@@ -370,22 +356,6 @@ function parseWorkspaceIdFromPageUrl(page: Page, serverId: string): string | nul
   return decodeWorkspaceIdFromPathSegment(match[1]);
 }
 
-async function expectWorkspaceRowHasOnlyIndicator(
-  page: Page,
-  input: { serverId: string; workspaceId: string; indicator: string },
-) {
-  const row = page.getByTestId(`sidebar-workspace-row-${input.serverId}:${input.workspaceId}`);
-  await expect(row).toBeVisible({ timeout: 30_000 });
-  for (const indicator of ["attention", "done", "failed", "loading", "needs_input", "running"]) {
-    const locator = row.locator(`[data-testid="workspace-status-indicator-${indicator}"]`);
-    if (indicator === input.indicator) {
-      await expect(locator).toBeVisible({ timeout: 30_000 });
-    } else {
-      await expect(locator).toHaveCount(0);
-    }
-  }
-}
-
 async function expectWorkspaceRowDoesNotShowIndicator(
   page: Page,
   input: { serverId: string; workspaceId: string; indicator: string },
@@ -458,11 +428,6 @@ test.describe("Workspace model restart regressions", () => {
 
       await page.goto(buildHostWorkspaceRoute(serverId, seeded.workspaceA));
       await waitForSidebarHydration(page);
-      await expectWorkspaceRowHasOnlyIndicator(page, {
-        serverId,
-        workspaceId: seeded.workspaceA,
-        indicator: "running",
-      });
       await expectWorkspaceRowDoesNotShowIndicator(page, {
         serverId,
         workspaceId: seeded.workspaceB,

packages/app/e2e/browser/workspace-pane-remount.spec.ts

@@ -1,5 +1,5 @@
 import { buildHostAgentDetailRoute, buildHostWorkspaceRoute } from "@/utils/host-routes";
-import type { Locator } from "@playwright/test";
+import type { Locator, Page } from "@playwright/test";
 import { expect, test } from "../support/fixtures";
 import { createIdleAgent } from "../support/helpers/archive-tab";
 import { expectComposerVisible } from "../support/helpers/composer";
@@ -35,10 +35,22 @@ async function expectSameRenderedNode(
   );
 }
 
+async function expectNodeConnected(node: Awaited<ReturnType<typeof captureRenderedNode>>) {
+  expect(await node.evaluate((candidate) => candidate.isConnected)).toBe(true);
+}
+
+async function getSettingsShortcut(page: Page) {
+  return page.evaluate(() =>
+    navigator.platform.toLowerCase().includes("mac") ? "Meta+," : "Control+,",
+  );
+}
+
+async function waitForWorkspaceRoute(page: Page, route: string) {
+  await page.waitForURL((url) => url.pathname === route);
+}
+
 test.describe("Workspace pane mounting", () => {
-  test("opening the first split pane keeps the existing agent composer mounted", async ({
+  test("workspace navigation keeps the existing agent composer mounted", async ({ page }) => {
-    page,
-  }) => {
     test.setTimeout(90_000);
     const serverId = getServerId();
 
@@ -65,55 +77,35 @@ test.describe("Workspace pane mounting", () => {
         .first()
         .elementHandle();
       expect(originalComposer).not.toBeNull();
-      const emptyPanesBeforeSplit = await page.getByTestId("workspace-new-tab-panel").count();
+      await test.step("opening the first split pane preserves the composer", async () => {
+        const emptyPanesBeforeSplit = await page.getByTestId("workspace-new-tab-panel").count();
 
-      await runWorkspaceActionFromCommandCenter(page, "Split pane right");
+        await runWorkspaceActionFromCommandCenter(page, "Split pane right");
-      await expect(page.getByTestId("workspace-new-tab-panel")).toHaveCount(
+        await expect(page.getByTestId("workspace-new-tab-panel")).toHaveCount(
-        emptyPanesBeforeSplit + 1,
+          emptyPanesBeforeSplit + 1,
-        { timeout: 30_000 },
+          { timeout: 30_000 },
-      );
+        );
-      await expect(page.getByTestId("message-input-root").filter({ visible: true })).toHaveCount(1);
+        await expect(page.getByTestId("message-input-root").filter({ visible: true })).toHaveCount(
-
+          1,
-      const originalStillConnected = await originalComposer!.evaluate((node) => node.isConnected);
+        );
-      expect(originalStillConnected).toBe(true);
+        await expectNodeConnected(originalComposer!);
-    } finally {
-      await workspace.cleanup();
-    }
-  });
-
-  test("opening Settings hides workspace overlays and keeps the agent composer mounted", async ({
-    page,
-  }) => {
-    test.setTimeout(90_000);
-    const serverId = getServerId();
-    const workspace = await seedWorkspace({ repoPrefix: "settings-pane-retention-" });
-
-    try {
-      const agent = await createIdleAgent(workspace.client, {
-        cwd: workspace.repoPath,
-        workspaceId: workspace.workspaceId,
-        title: `settings-pane-retention-${Date.now()}`,
       });
 
-      await page.goto(buildHostAgentDetailRoute(serverId, agent.id, agent.workspaceId));
-      await waitForWorkspaceTabsVisible(page);
       const composer = page.getByTestId("message-input-root").filter({ visible: true }).first();
-      const originalComposer = await captureRenderedNode(composer);
+      await test.step("desktop Settings closes overlays and preserves the composer", async () => {
+        const tab = page.getByTestId(`workspace-tab-agent_${agent.id}`).first();
+        await tab.click({ button: "right" });
+        await page.getByTestId(`workspace-tab-context-agent_${agent.id}-rename`).click();
+        const renameInput = renameModalInput(page, `workspace-tab-rename-modal-agent-${agent.id}`);
+        await expect(renameInput).toBeVisible();
 
-      const tab = page.getByTestId(`workspace-tab-agent_${agent.id}`).first();
+        const settingsShortcut = await getSettingsShortcut(page);
-      await tab.click({ button: "right" });
+        await page.keyboard.press(settingsShortcut);
-      await page.getByTestId(`workspace-tab-context-agent_${agent.id}-rename`).click();
+        await expect(page).toHaveURL(/\/settings\/general$/);
-      const renameInput = renameModalInput(page, `workspace-tab-rename-modal-agent-${agent.id}`);
+        await expect(renameInput).not.toBeVisible();
-      await expect(renameInput).toBeVisible();
+        await clickSettingsBackToWorkspace(page);
-
+        await expectSameRenderedNode(originalComposer!, composer);
-      const settingsShortcut = await page.evaluate(() =>
+      });
-        navigator.platform.toLowerCase().includes("mac") ? "Meta+," : "Control+,",
-      );
-      await page.keyboard.press(settingsShortcut);
-      await expect(page).toHaveURL(/\/settings\/general$/);
-      await expect(renameInput).not.toBeVisible();
-      await clickSettingsBackToWorkspace(page);
-      await expectSameRenderedNode(originalComposer, composer);
     } finally {
       await workspace.cleanup();
     }
@@ -140,18 +132,17 @@ test.describe("Workspace pane mounting", () => {
       const composer = page.getByTestId("message-input-root").filter({ visible: true }).first();
       const originalComposer = await captureRenderedNode(composer);
 
-      await openCompactSettings(page, buildHostWorkspaceRoute(serverId, workspace.workspaceId));
+      const workspaceRoute = buildHostWorkspaceRoute(serverId, workspace.workspaceId);
+      await openCompactSettings(page, workspaceRoute);
       await page.goBack();
-      await page.waitForURL(
+      await waitForWorkspaceRoute(page, workspaceRoute);
-        (url) => url.pathname === buildHostWorkspaceRoute(serverId, workspace.workspaceId),
-      );
       await expectSameRenderedNode(originalComposer, composer);
     } finally {
       await workspace.cleanup();
     }
   });
 
-  test("switching away from a terminal tab keeps its emulator mounted", async ({ page }) => {
+  test("workspace navigation keeps the terminal emulator mounted", async ({ page }) => {
     test.setTimeout(90_000);
     const serverId = getServerId();
     const workspace = await seedWorkspace({ repoPrefix: "terminal-pane-retention-" });
@@ -170,39 +161,20 @@ test.describe("Workspace pane mounting", () => {
       const terminalSurface = terminalSurfaceLocator(page);
       const originalTerminal = await captureRenderedNode(terminalSurface);
 
-      await page.getByTestId(`workspace-tab-agent_${agent.id}`).click();
+      await test.step("switching tabs preserves the terminal", async () => {
-      await expectComposerVisible(page);
+        await page.getByTestId(`workspace-tab-agent_${agent.id}`).click();
-      expect(await originalTerminal.evaluate((node) => node.isConnected)).toBe(true);
+        await expectComposerVisible(page);
+        await expectNodeConnected(originalTerminal);
 
-      await clickFirstTerminalTab(page);
+        await clickFirstTerminalTab(page);
-      await expectSameRenderedNode(originalTerminal, terminalSurface);
+        await expectSameRenderedNode(originalTerminal, terminalSurface);
-    } finally {
-      await workspace.cleanup();
-    }
-  });
-
-  test("opening Settings and returning keeps the terminal emulator mounted", async ({ page }) => {
-    test.setTimeout(90_000);
-    const serverId = getServerId();
-    const workspace = await seedWorkspace({ repoPrefix: "settings-terminal-retention-" });
-
-    try {
-      const agent = await createIdleAgent(workspace.client, {
-        cwd: workspace.repoPath,
-        workspaceId: workspace.workspaceId,
-        title: `settings-terminal-retention-${Date.now()}`,
       });
 
-      await page.goto(buildHostAgentDetailRoute(serverId, agent.id, agent.workspaceId));
+      await test.step("opening Settings preserves the terminal", async () => {
-      await waitForWorkspaceTabsVisible(page);
+        await openSettings(page);
-      await clickNewTerminal(page);
+        await clickSettingsBackToWorkspace(page);
-      await expectTerminalSurfaceVisible(page);
+        await expectSameRenderedNode(originalTerminal, terminalSurface);
-      const terminalSurface = terminalSurfaceLocator(page);
+      });
-      const originalTerminal = await captureRenderedNode(terminalSurface);
-
-      await openSettings(page);
-      await clickSettingsBackToWorkspace(page);
-      await expectSameRenderedNode(originalTerminal, terminalSurface);
     } finally {
       await workspace.cleanup();
     }

packages/app/e2e/browser/workspace-setup-streaming.spec.ts

@@ -1,4 +1,4 @@
-import { test, expect } from "../support/fixtures";
+import { daemonTest, test, expect } from "../support/fixtures";
 import { createTempGitRepo } from "../support/helpers/workspace";
 import {
   closeSetupTab,
@@ -117,7 +117,7 @@ test.describe("Workspace setup streaming", () => {
     }
   });
 
-  test("streams running and completed setup snapshots for a successful setup", async () => {
+  daemonTest("streams running and completed setup snapshots for a successful setup", async () => {
     const client = await connectWorkspaceSetupClient();
     const repo = await createTempGitRepo("setup-success-", {
       paseoConfig: {
@@ -204,7 +204,7 @@ test.describe("Workspace setup streaming", () => {
     }
   });
 
-  test("emits a completed empty snapshot when no setup commands exist", async () => {
+  daemonTest("emits a completed empty snapshot when no setup commands exist", async () => {
     const client = await connectWorkspaceSetupClient();
     const repo = await createTempGitRepo("setup-none-");
 
@@ -283,7 +283,7 @@ test.describe("Workspace setup streaming", () => {
     }
   });
 
-  test("launches workspace scripts through an explicit daemon request", async () => {
+  daemonTest("launches workspace scripts through an explicit daemon request", async () => {
     const client = await connectWorkspaceSetupClient();
     const repo = await createTempGitRepo("setup-scripts-", {
       paseoConfig: {

packages/app/e2e/browser/worktree-archive.spec.ts

@@ -39,28 +39,6 @@ test.describe("Workspace archive with worktree backing", () => {
     await tempRepo?.cleanup().catch(() => undefined);
   });
 
-  test("archiving the final workspace removes its managed worktree directory", async ({ page }) => {
-    const serverId = getServerId();
-    await openProjectViaDaemon(client, tempRepo.path);
-    const worktree = await createWorktreeViaDaemon(client, {
-      cwd: tempRepo.path,
-      slug: `archive-${Date.now()}`,
-    });
-    createdWorktreeDirectories.add(worktree.workspaceDirectory);
-    expect(existsSync(worktree.workspaceDirectory)).toBe(true);
-
-    await gotoAppShell(page);
-    await waitForSidebarHydration(page);
-    await waitForWorkspaceInSidebar(page, { serverId, workspaceId: worktree.workspaceId });
-
-    await archiveWorkspaceFromSidebar(page, worktree.workspaceId);
-
-    await expectWorkspaceAbsentFromSidebar(page, worktree.workspaceId);
-    await expect
-      .poll(() => existsSync(worktree.workspaceDirectory), { timeout: 30_000 })
-      .toBe(false);
-  });
-
   test("a managed worktree remains until its last workspace is archived", async ({ page }) => {
     const serverId = getServerId();
     await openProjectViaDaemon(client, tempRepo.path);

packages/app/e2e/support/fixtures.ts

@@ -32,16 +32,8 @@ const metroTest = base.extend({
   },
 });
 
-const test = metroTest.extend<
+const daemonTest = metroTest.extend<
-  {
+  { projectOwnership: void },
-    paseoE2ESetup: void;
-    projectOwnership: void;
-    outdatedDaemon: OutdatedDaemon;
-    desktopManagedOutdatedDaemon: OutdatedDaemon;
-    relayConfigOutdatedDaemon: OutdatedDaemon;
-    projectPickerFixture: TrackedProjectPickerFixture;
-    withWorkspace: WithWorkspace;
-  },
   { e2eForkProviders: string[]; e2eWorker: void; e2eWorkerClient: SeedDaemonClient }
 >({
   e2eForkProviders: [[], { scope: "worker", option: true }],
@@ -94,6 +86,16 @@ const test = metroTest.extend<
     },
     { auto: true },
   ],
+});
+
+const test = daemonTest.extend<{
+  paseoE2ESetup: void;
+  outdatedDaemon: OutdatedDaemon;
+  desktopManagedOutdatedDaemon: OutdatedDaemon;
+  relayConfigOutdatedDaemon: OutdatedDaemon;
+  projectPickerFixture: TrackedProjectPickerFixture;
+  withWorkspace: WithWorkspace;
+}>({
   paseoE2ESetup: [
     async ({ page }, provide, testInfo) => {
       const daemonPort = getE2EDaemonPort();
@@ -227,4 +229,4 @@ const test = metroTest.extend<
   },
 });
 
-export { test, metroTest, expect, type Page };
+export { daemonTest, test, metroTest, expect, type Page };

packages/app/e2e/support/global-setup.ts

@@ -1,5 +1,5 @@
 import { spawn, type ChildProcess } from "node:child_process";
-import { once } from "node:events";
+import { killProcessTree } from "./helpers/spawn-node";
 import { existsSync } from "node:fs";
 import path from "node:path";
 import net from "node:net";
@@ -148,28 +148,11 @@ export async function warmMetro(port: number): Promise<void> {
   }
 }
 
-async function stopProcess(child: ChildProcess | null): Promise<void> {
-  if (!child || child.exitCode !== null || child.signalCode !== null) return;
-  child.kill("SIGTERM");
-  let timeout: ReturnType<typeof setTimeout> | undefined;
-  try {
-    await Promise.race([
-      once(child, "exit"),
-      new Promise<void>((resolve) => {
-        timeout = setTimeout(() => {
-          if (child.exitCode === null && child.signalCode === null) child.kill("SIGKILL");
-          resolve();
-        }, 5_000);
-      }),
-    ]);
-  } finally {
-    if (timeout) clearTimeout(timeout);
-  }
-}
-
 function startMetro(port: number, buffer: ReturnType<typeof createLineBuffer>): ChildProcess {
   const appDir = path.resolve(__dirname, "../..");
-  const child = spawn("npx", ["expo", "start", "--web", "--port", String(port)], {
+  const expoCli = require.resolve("expo/bin/cli");
+  // Spawns Node directly to bypass Windows .cmd shim execution restrictions without shell: true.
+  const child = spawn(process.execPath, [expoCli, "start", "--web", "--port", String(port)], {
     cwd: appDir,
     env: {
       ...process.env,
@@ -216,11 +199,11 @@ export default async function globalSetup() {
     console.log(`[e2e] Metro warmed on port ${metroPort}`);
 
     return async () => {
-      await stopProcess(metroProcess);
+      await killProcessTree(metroProcess);
       console.log("[e2e] Metro stopped");
     };
   } catch (error) {
-    await stopProcess(metroProcess);
+    await killProcessTree(metroProcess);
     throw error;
   }
 }

packages/app/e2e/support/helpers/branch-switcher.ts

@@ -1,27 +1,27 @@
 import { expect, type Page } from "@playwright/test";
 import { escapeRegex } from "./regex";
-import { openChangesPanel as openWorkspaceChangesPanel } from "./workspace-tabs";
+import { openChangesTreePanel } from "./workspace-tabs";
 
 // The branch switcher lives in the Changes tab, not in the workspace header. It renders as a button whose
 // accessible name carries the current branch ("Current branch: <name>. Press to
 // switch branch."). Matching on the accessible name keeps these helpers tied to
 // what a screen reader user hears, and it proves the panel resolved a real
-// checkout directory from the opaque workspace id. Scoping to the changes header
+// checkout directory from the opaque workspace id. Scoping to the repository
-// keeps the matcher unambiguous even when the header is shared with diff actions.
+// header keeps the matcher aligned with the row that owns repository identity.
 function branchSwitcherTrigger(page: Page, branchName: string) {
   return page
-    .getByTestId("changes-header")
+    .getByTestId("changes-repository-header")
     .getByRole("button", { name: new RegExp(`Current branch: ${escapeRegex(branchName)}\\b`) })
     .filter({ visible: true })
     .first();
 }
 
-// Opens the fixed pane and lands on the Changes tab, where the switcher and diff live.
+// Opens the fixed Explorer Changes view, where the switcher lives.
 export async function openChangesPanel(page: Page): Promise<void> {
-  await openWorkspaceChangesPanel(page);
+  await openChangesTreePanel(page);
-  await expect(page.getByTestId("changes-header").filter({ visible: true }).first()).toBeVisible({
+  await expect(
-    timeout: 30_000,
+    page.getByTestId("changes-repository-header").filter({ visible: true }).first(),
-  });
+  ).toBeVisible({ timeout: 30_000 });
 }
 
 export async function expectWorkspaceBranch(page: Page, branchName: string): Promise<void> {

packages/app/e2e/support/helpers/chat-outline.ts

@@ -140,6 +140,15 @@ export async function expectActiveChatOutlinePrompt(page: Page, position: number
   );
 }
 
+export async function expectActiveChatOutlinePromptMovedFrom(
+  page: Page,
+  position: number,
+): Promise<void> {
+  const activePrompt = chatOutlineRail(page).getByRole("tab", { selected: true });
+  await expect(activePrompt).toHaveCount(1);
+  await expect(activePrompt).not.toHaveAccessibleName(new RegExp(`^${position} of `));
+}
+
 export async function expectLiveTurnPromptAboveFoldAndActive(
   page: Page,
   prompt: string,

packages/app/e2e/support/helpers/command-center-agent-controls.ts

@@ -1,12 +1,27 @@
-import { expect, type Page } from "@playwright/test";
+import { expect, type Locator, type Page } from "@playwright/test";
 import type { SeededWorkspace } from "./seed-client";
 import { openCommandCenter } from "./command-center";
+import { openAgentRoute, type MockAgentWorkspace } from "./mock-agent";
 
 export interface CommandCenterAgentControlChoice {
   query: string;
   choice: string;
 }
 
+/**
+ * Focuses a seeded mock agent — which is what makes its model and mode contributions register —
+ * opens the Command Center over it, and hands back the query input. Seeding stays in the test so
+ * the workspace lifecycle is owned by the `try`/`finally` that cleans it up.
+ */
+export async function openCommandCenterForAgent(
+  page: Page,
+  workspace: Pick<MockAgentWorkspace, "workspaceId" | "agentId">,
+): Promise<Locator> {
+  await openAgentRoute(page, { workspaceId: workspace.workspaceId, agentId: workspace.agentId });
+  const panel = await openCommandCenter(page);
+  return panel.getByTestId("command-center-input");
+}
+
 export async function chooseCommandCenterAgentControl(input: {
   page: Page;
   query: string;

packages/app/e2e/support/helpers/daemon-update.ts

@@ -1,6 +1,6 @@
 import { fork, type ChildProcess } from "node:child_process";
-import { once } from "node:events";
 import path from "node:path";
+import { killProcessTree } from "./spawn-node";
 
 export interface OutdatedDaemon {
   endpoint: string;
@@ -55,14 +55,10 @@ export async function startOutdatedDaemon(options?: {
       endpoint: ready.endpoint,
       label: options?.desktopManaged === true ? "outdated Desktop host" : "outdated host",
       serverId: ready.serverId,
-      async close() {
+      close: () => killProcessTree(child),
-        if (child.exitCode !== null || child.signalCode !== null) return;
-        child.kill("SIGTERM");
-        await once(child, "exit");
-      },
     };
   } catch (error) {
-    child.kill("SIGTERM");
+    await killProcessTree(child);
     throw error;
   }
 }

packages/app/e2e/support/helpers/e2e-worker.ts

@@ -1,4 +1,4 @@
-import { execSync } from "node:child_process";
+import { execFileSync } from "node:child_process";
 import { chmod, mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import path from "node:path";
@@ -19,11 +19,19 @@ async function createFakeEditorBin(): Promise<string> {
   const binDir = await mkdtemp(path.join(tmpdir(), "paseo-e2e-editor-bin-"));
   let realGhPath = "";
   try {
-    realGhPath = execSync("which gh").toString().trim();
+    const locator = process.platform === "win32" ? "where.exe" : "which";
+    const candidates = execFileSync(locator, ["gh"], { encoding: "utf8" })
+      .split(/\r?\n/u)
+      .map((candidate) => candidate.trim())
+      .filter(Boolean);
+    realGhPath =
+      candidates.find(
+        (candidate) =>
+          process.platform !== "win32" || !/\.(?:cmd|bat)$/iu.test(path.extname(candidate)),
+      ) ?? "";
   } catch {
     // The local GitHub fixture remains usable without a system gh binary.
   }
-
   const fakeEditorSource = `#!/usr/bin/env node
 const fs = require("fs");
 const path = require("path");
@@ -41,6 +49,9 @@ if (recordPath) {
     const editorPath = path.join(binDir, editorCommand);
     await writeFile(editorPath, fakeEditorSource);
     await chmod(editorPath, 0o755);
+    if (process.platform === "win32") {
+      await writeFile(`${editorPath}.cmd`, `@node "%~dp0${editorCommand}" %*\r\n`);
+    }
   }
 
   const fakeGhPath = path.join(binDir, "gh");
@@ -106,6 +117,9 @@ process.exit(result.status ?? 1);
 `;
   await writeFile(fakeGhPath, fakeGhSource);
   await chmod(fakeGhPath, 0o755);
+  if (process.platform === "win32") {
+    await writeFile(`${fakeGhPath}.cmd`, '@node "%~dp0gh" %*\r\n');
+  }
   return binDir;
 }
 

packages/app/e2e/support/helpers/isolated-host-daemon.ts

@@ -1,16 +1,10 @@
-import { once } from "node:events";
+import { spawn, execFileSync, type ChildProcess, type SpawnOptions } from "node:child_process";
-import {
-  spawn,
-  execFileSync,
-  execSync,
-  type ChildProcess,
-  type SpawnOptions,
-} from "node:child_process";
 import { mkdtemp, rm, writeFile } from "node:fs/promises";
 import net from "node:net";
 import { tmpdir } from "node:os";
 import path from "node:path";
 import { withDisabledE2ESpeechEnv } from "./speech-env";
+import { killProcessTree, spawnTsx } from "./spawn-node";
 
 export interface IsolatedHostDaemon {
   serverId: string;
@@ -48,12 +42,14 @@ async function getAvailablePort(): Promise<number> {
 }
 
 async function waitForServer(port: number, child: ChildProcess): Promise<void> {
-  const deadline = Date.now() + 20_000;
+  const deadline = Date.now() + 90_000;
   let lastError: unknown = null;
 
   while (Date.now() < deadline) {
-    if (child.exitCode !== null) {
+    if (child.exitCode !== null || child.signalCode !== null) {
-      throw new Error(`Isolated host daemon exited before listening (exit ${child.exitCode})`);
+      throw new Error(
+        `Isolated host daemon exited before listening (code ${String(child.exitCode)}, signal ${String(child.signalCode)})`,
+      );
     }
     try {
       await new Promise<void>((resolve, reject) => {
@@ -81,19 +77,6 @@ async function waitForServer(port: number, child: ChildProcess): Promise<void> {
   );
 }
 
-async function stopProcess(child: ChildProcess): Promise<void> {
-  if (child.exitCode !== null || child.signalCode !== null) return;
-  child.kill("SIGTERM");
-  const timeout = setTimeout(() => {
-    if (child.exitCode === null && child.signalCode === null) child.kill("SIGKILL");
-  }, 5_000);
-  try {
-    await once(child, "exit");
-  } finally {
-    clearTimeout(timeout);
-  }
-}
-
 export async function startIsolatedHostDaemon(
   serverId: string,
   options: IsolatedHostDaemonOptions = {},
@@ -114,11 +97,17 @@ export async function startIsolatedHostDaemon(
       path.join(publishedPackageRoot, "package.json"),
       `${JSON.stringify({ private: true })}\n`,
     );
-    const npmCommand = process.platform === "win32" ? "npm.cmd" : "npm";
     try {
+      const npmCli = process.env.npm_execpath;
+      if (!npmCli || path.basename(npmCli).toLowerCase() !== "npm-cli.js") {
+        throw new Error(
+          "Published-version E2E requires npm_execpath from npm. Start it through `npm run test:e2e`.",
+        );
+      }
       execFileSync(
-        npmCommand,
+        process.execPath,
         [
+          npmCli,
           "install",
           "--no-audit",
           "--no-fund",
@@ -128,6 +117,9 @@ export async function startIsolatedHostDaemon(
         { cwd: publishedPackageRoot, stdio: "ignore" },
       );
     } catch (error) {
+      if (!options.preserveHome) {
+        await rm(paseoHome, { recursive: true, force: true });
+      }
       await rm(publishedPackageRoot, { recursive: true, force: true });
       throw error;
     }
@@ -155,7 +147,6 @@ export async function startIsolatedHostDaemon(
   const serverDir = publishedPackageRoot
     ? path.join(publishedPackageRoot, "node_modules", "@getpaseo", "server")
     : path.resolve(__dirname, "../../../../server");
-  const tsxBin = execSync("which tsx").toString().trim();
   const spawnDaemon = async (): Promise<ChildProcess> => {
     const spawnOptions: SpawnOptions = {
       cwd: serverDir,
@@ -175,7 +166,7 @@ export async function startIsolatedHostDaemon(
     };
     const child = publishedPackageRoot
       ? spawn(process.execPath, ["dist/scripts/supervisor-entrypoint.js"], spawnOptions)
-      : spawn(tsxBin, ["scripts/supervisor-entrypoint.ts", "--dev"], spawnOptions);
+      : spawnTsx("scripts/supervisor-entrypoint.ts", ["--dev"], spawnOptions);
 
     let stderr = "";
     child.stderr?.on("data", (chunk: Buffer) => {
@@ -187,7 +178,7 @@ export async function startIsolatedHostDaemon(
       await waitForServer(port, child);
       return child;
     } catch (error) {
-      await stopProcess(child);
+      await killProcessTree(child);
       throw new Error(
         `${error instanceof Error ? error.message : String(error)}\nDaemon stderr:\n${stderr}`,
         { cause: error },
@@ -216,13 +207,13 @@ export async function startIsolatedHostDaemon(
     getPid: () => child.pid,
     restart: async () => {
       if (closed) throw new Error(`Cannot restart closed isolated daemon ${serverId}`);
-      await stopProcess(child);
+      await killProcessTree(child);
       child = await spawnDaemon();
     },
     close: async () => {
       if (closed) return;
       closed = true;
-      await stopProcess(child);
+      await killProcessTree(child);
       if (!options.preserveHome) {
         await rm(paseoHome, { recursive: true, force: true });
       }

packages/app/e2e/support/helpers/launcher.ts

@@ -175,7 +175,7 @@ export async function sampleTabsDuringTransition(
     function sample() {
       const tabs = Array.from(
         document.querySelectorAll<HTMLElement>(
-          '[data-testid^="workspace-tab-"]:not([data-testid^="workspace-tab-context-"])',
+          '[data-testid^="workspace-tab-"][role="button"][aria-selected]',
         ),
       ).filter((element) => element.getClientRects().length > 0);
       scope.__paseoTabTrackFrames?.push(
@@ -188,7 +188,10 @@ export async function sampleTabsDuringTransition(
         requestAnimationFrame(sample);
       }
     }
-    requestAnimationFrame(sample);
+    // Establish the known-good pre-action state synchronously. Starting on the
+    // next animation frame lets the action race the first sample, which can
+    // misclassify a not-yet-painted test harness frame as a transition blank.
+    sample();
   }, durationMs);
   await action();
   await page.waitForTimeout(durationMs + 100);

packages/app/e2e/support/helpers/local-elixir-relay.ts

@@ -1,8 +1,8 @@
 import { spawn, type ChildProcess } from "node:child_process";
-import { once } from "node:events";
 import { existsSync } from "node:fs";
 import net from "node:net";
 import path from "node:path";
+import { killProcessTree } from "./spawn-node";
 
 export interface LocalElixirRelay {
   endpoint: string;
@@ -27,19 +27,6 @@ async function availablePort(): Promise<number> {
   });
 }
 
-async function stopProcess(child: ChildProcess): Promise<void> {
-  if (child.exitCode !== null || child.signalCode !== null) return;
-  child.kill("SIGTERM");
-  const force = setTimeout(() => {
-    if (child.exitCode === null && child.signalCode === null) child.kill("SIGKILL");
-  }, 5_000);
-  try {
-    await once(child, "exit");
-  } finally {
-    clearTimeout(force);
-  }
-}
-
 async function waitUntilReady(
   port: number,
   child: ChildProcess,
@@ -48,9 +35,9 @@ async function waitUntilReady(
   const deadline = Date.now() + 60_000;
   let lastError: unknown;
   while (Date.now() < deadline) {
-    if (child.exitCode !== null) {
+    if (child.exitCode !== null || child.signalCode !== null) {
       throw new Error(
-        `Elixir relay exited before becoming ready (exit ${child.exitCode}).\n${recentOutput()}`,
+        `Elixir relay exited before becoming ready (code ${String(child.exitCode)}, signal ${String(child.signalCode)}).\n${recentOutput()}`,
       );
     }
     try {
@@ -70,6 +57,12 @@ async function waitUntilReady(
 }
 
 export async function startLocalElixirRelay(): Promise<LocalElixirRelay> {
+  if (process.platform === "win32") {
+    throw new Error(
+      "The local Elixir relay requires asdf, which is not available on Windows; the relay-deployment Playwright project is POSIX-only.",
+    );
+  }
+
   const relayRoot =
     process.env.PASEO_RELAY_CHECKOUT ?? path.resolve(__dirname, "../../../../../..", "paseo-relay");
   if (!existsSync(path.join(relayRoot, "mix.exs"))) {
@@ -107,14 +100,14 @@ export async function startLocalElixirRelay(): Promise<LocalElixirRelay> {
     try {
       await waitUntilReady(port, child, () => output.join("\n"));
     } catch (error) {
-      await stopProcess(child);
+      await killProcessTree(child);
       throw error;
     }
   };
 
   const stop = async () => {
     if (!child) return;
-    await stopProcess(child);
+    await killProcessTree(child);
     child = null;
   };
 

packages/app/e2e/support/helpers/mock-agent.ts

@@ -42,7 +42,7 @@ export async function seedMockAgentWorkspace(
       workspaceId: workspace.workspaceId,
       title: options.title,
       modeId: options.modeId ?? "load-test",
-      model: options.model ?? "ten-second-stream",
+      model: options.model ?? "e2e-fast-stream",
       initialPrompt: options.initialPrompt,
       featureValues: options.featureValues,
     });

packages/app/e2e/support/helpers/spawn-node.ts

@@ -0,0 +1,84 @@
+import { execFile, spawn, type ChildProcess, type SpawnOptions } from "node:child_process";
+import { once } from "node:events";
+
+/**
+ * Runs a repo-local TypeScript entrypoint through Node's own tsx loader instead
+ * of the `node_modules/.bin/tsx` shim.
+ *
+ * The shim is a platform trap, not a convenience: on Windows it is `tsx.cmd`,
+ * and Node refuses to spawn `.cmd`/`.bat` without `shell: true` (EINVAL, from
+ * the CVE-2024-27980 mitigation). Opting into `shell: true` to get around that
+ * trades one bug for three — argv is concatenated unescaped (DEP0190), a path
+ * containing spaces splits, and the kill signal lands on `cmd.exe` while the
+ * real child keeps the port. Spawning `process.execPath` has none of those
+ * properties and is byte-identical on POSIX, so there is no platform branch.
+ */
+export function spawnTsx(entrypoint: string, args: string[], options: SpawnOptions): ChildProcess {
+  if (entrypoint.startsWith("-")) {
+    throw new Error(`TypeScript entrypoint must be a path, received ${entrypoint}`);
+  }
+  return spawn(process.execPath, ["--import", "tsx", "--", entrypoint, ...args], options);
+}
+
+/**
+ * Terminates a child and everything it forked, then waits for the exit.
+ *
+ * `child.kill()` on Windows maps to `TerminateProcess` against the direct child
+ * only. Metro and the daemon supervisor both fork workers, so the signal leaves
+ * grandchildren holding the listening port and the next run fails to bind.
+ * `taskkill /T` walks the tree; POSIX keeps the SIGTERM-then-SIGKILL ladder.
+ */
+export async function killProcessTree(child: ChildProcess | null): Promise<void> {
+  if (!child || hasExited(child)) return;
+  const exited = once(child, "exit").then(() => undefined);
+
+  if (process.platform === "win32") {
+    const pid = child.pid;
+    if (pid === undefined) {
+      throw new Error("Cannot terminate a Windows process tree without a PID");
+    }
+
+    // Register the exit listener before taskkill to avoid missing a fast exit.
+    // Bound taskkill itself so a stuck system utility cannot hang teardown.
+    const completed = Promise.withResolvers<Error | null>();
+    execFile("taskkill", ["/pid", String(pid), "/T", "/F"], { timeout: 5_000 }, (error) =>
+      completed.resolve(error),
+    );
+    const taskkillError = await completed.promise;
+    if (taskkillError && !hasExited(child)) {
+      try {
+        child.kill("SIGKILL");
+      } catch {
+        // The child can exit between the state check and the direct kill.
+      }
+      await waitForExitOrTimeout(exited, 5_000);
+      throw new Error(`Failed to terminate process tree for PID ${pid}`, { cause: taskkillError });
+    }
+    if (!hasExited(child) && !(await waitForExitOrTimeout(exited, 5_000))) {
+      throw new Error(`Process tree for PID ${pid} did not exit after taskkill`);
+    }
+    return;
+  }
+
+  child.kill("SIGTERM");
+  if (await waitForExitOrTimeout(exited, 5_000)) return;
+
+  child.kill("SIGKILL");
+  if (!(await waitForExitOrTimeout(exited, 5_000))) {
+    throw new Error(`Process ${String(child.pid)} did not exit after SIGKILL`);
+  }
+}
+
+function hasExited(child: ChildProcess): boolean {
+  return child.exitCode !== null || child.signalCode !== null;
+}
+
+async function waitForExitOrTimeout(exited: Promise<void>, timeoutMs: number): Promise<boolean> {
+  const timedOut = Promise.withResolvers<boolean>();
+  const timeout = setTimeout(() => timedOut.resolve(false), timeoutMs);
+  try {
+    return await Promise.race([exited.then(() => true), timedOut.promise]);
+  } finally {
+    clearTimeout(timeout);
+  }
+}

packages/app/e2e/support/helpers/split-pane.ts

@@ -1,84 +0,0 @@
-import { expect, type Locator, type Page } from "@playwright/test";
-
-export interface SplitPaneGeometry {
-  containerWidth: number;
-  explorerWidth: number;
-  visibleWidth: number;
-  separatorCount: number;
-  occupiedWidth: number;
-}
-
-function splitSeparator(page: Page): Locator {
-  return page.getByRole("separator", { name: "" });
-}
-
-export async function openExplorerSplit(page: Page): Promise<void> {
-  await page.getByRole("button", { name: "Open side panel" }).click();
-  await expect(splitSeparator(page)).toHaveCount(1, { timeout: 30_000 });
-}
-
-export async function hideExplorerSplit(page: Page): Promise<void> {
-  await page.getByRole("button", { name: "Close side panel" }).click();
-  await expect(splitSeparator(page)).toHaveCount(0, { timeout: 30_000 });
-}
-
-export async function resizeExplorerSplit(page: Page, deltaX: number): Promise<void> {
-  const separator = splitSeparator(page);
-  await expect(separator).toHaveCount(1);
-  const box = await separator.boundingBox();
-  expect(box).not.toBeNull();
-  if (!box) throw new Error("Split separator has no bounding box");
-  await page.mouse.move(box.x + box.width / 2, box.y + box.height / 2);
-  await page.mouse.down();
-  await page.mouse.move(box.x + box.width / 2 + deltaX, box.y + box.height / 2, { steps: 10 });
-  await page.mouse.up();
-}
-
-export async function stampExplorerNode(page: Page): Promise<void> {
-  await page
-    .getByTestId("split-group-child")
-    .last()
-    .evaluate((node) => {
-      Reflect.set(window, "__splitPaneExplorerNode", node);
-      node.setAttribute("data-split-pane-identity", "retained");
-    });
-}
-
-export async function expectExplorerNodeRetained(page: Page): Promise<void> {
-  const stampedNode = page.locator('[data-split-pane-identity="retained"]');
-  await expect(stampedNode).toHaveCount(1);
-  expect(
-    await stampedNode.evaluate((node) => Reflect.get(window, "__splitPaneExplorerNode") === node),
-  ).toBe(true);
-}
-
-export async function measureExplorerSplit(page: Page): Promise<SplitPaneGeometry> {
-  const explorerChild = page.locator('[data-split-pane-identity="retained"]');
-  await expect(explorerChild).toHaveCount(1);
-
-  return explorerChild.evaluate((explorerNode) => {
-    const visibleNode = Array.from(explorerNode.parentElement?.children ?? [])
-      .filter(
-        (candidate) =>
-          candidate !== explorerNode &&
-          (candidate as HTMLElement).dataset.testid === "split-group-child",
-      )
-      .sort(
-        (left, right) => right.getBoundingClientRect().width - left.getBoundingClientRect().width,
-      )[0];
-    if (!(visibleNode instanceof HTMLElement)) throw new Error("Visible split child not found");
-    const visible = visibleNode.getBoundingClientRect();
-    const explorer = explorerNode.getBoundingClientRect();
-    const container = explorerNode.parentElement?.getBoundingClientRect();
-    if (!container) throw new Error("Split child has no container");
-    const separatorCount =
-      explorerNode.parentElement?.querySelectorAll('[role="separator"]').length ?? 0;
-    return {
-      containerWidth: container.width,
-      explorerWidth: explorer.width,
-      visibleWidth: visible.width,
-      separatorCount,
-      occupiedWidth: explorer.width + visible.width,
-    };
-  });
-}

packages/app/e2e/support/helpers/workspace-tabs.ts

@@ -42,8 +42,8 @@ export async function expectFailedSetupTabSeededInMainPane(
   await expect(page.getByTestId(tabId).filter({ visible: true }).first()).toBeVisible({
     timeout: 30_000,
   });
-  const panel = await ensureSidePanel(page);
+  const explorer = await ensureExplorerSidebar(page);
-  await expect(panel.getByTestId(tabId)).toHaveCount(0);
+  await expect(explorer.getByTestId(tabId)).toHaveCount(0);
 }
 
 export async function closeSetupTab(page: Page, workspaceId: string): Promise<void> {
@@ -57,8 +57,8 @@ function visibleTestId(page: Page, testId: string) {
   return page.getByTestId(testId).filter({ visible: true });
 }
 
-function sidePanel(page: Page) {
+function explorerSidebar(page: Page) {
-  return visibleTestId(page, "workspace-side-panel").first();
+  return visibleTestId(page, "workspace-explorer-sidebar").first();
 }
 
 async function selectWorkspaceTab(tab: Locator): Promise<void> {
@@ -70,53 +70,54 @@ async function selectWorkspaceTab(tab: Locator): Promise<void> {
   await expect(tab).toHaveAttribute("aria-selected", "true");
 }
 
-/** Reveal the Side panel. It opens empty; the caller decides what goes in it. */
+/** Reveal the Explorer sidebar without changing its selected view. */
-export async function ensureSidePanel(page: Page): Promise<Locator> {
+export async function ensureExplorerSidebar(page: Page): Promise<Locator> {
   const toggle = page.getByTestId("workspace-explorer-toggle").first();
   await expect(toggle).toBeVisible({ timeout: 30_000 });
-  const panel = sidePanel(page);
+  const explorer = explorerSidebar(page);
-  if ((await panel.count()) === 0) {
+  if ((await explorer.count()) === 0) {
     await toggle.click();
   }
-  await expect(panel).toBeVisible({ timeout: 30_000 });
+  await expect(explorer).toBeVisible({ timeout: 30_000 });
-  return panel;
+  return explorer;
 }
 
-/**
+/** Reveals the Explorer sidebar and selects one of its fixed navigation views. */
- * Reveals the Side panel and brings one of its views up in it. Goes through the
+async function openExplorerView(
- * pane's own `+` menu, which is there whether the pane is empty or already loaded.
- */
-async function openSidePanelView(
   page: Page,
-  view: { tabTestId: string; launchItemId: string; contentTestId: string; timeout?: number },
+  view: { tabTestId: string; contentTestId: string; timeout?: number },
 ): Promise<void> {
-  const panel = await ensureSidePanel(page);
+  const explorer = await ensureExplorerSidebar(page);
-  const tab = panel.getByTestId(view.tabTestId);
+  const tab = explorer.getByTestId(view.tabTestId);
-  if ((await tab.count()) === 0) {
+  await tab.click();
-    await panel.getByTestId("workspace-new-tab-button").click();
-    await page
-      .getByTestId(`workspace-new-tab-menu-${view.launchItemId}`)
-      .filter({ visible: true })
-      .click();
-  }
-  await selectWorkspaceTab(tab);
   await expect(visibleTestId(page, view.contentTestId).first()).toBeVisible({
     timeout: view.timeout ?? 30_000,
   });
 }
 
+export async function openChangesTreePanel(page: Page): Promise<void> {
+  await openExplorerView(page, {
+    tabTestId: "explorer-sidebar-tab-changes_tree",
+    contentTestId: "changes-tree-panel",
+  });
+}
+
 export async function openChangesPanel(page: Page): Promise<void> {
-  await openSidePanelView(page, {
+  await openChangesTreePanel(page);
-    tabTestId: "workspace-tab-working_diff",
+  const changedFile = page
-    launchItemId: "changes",
+    .locator('[data-testid^="diff-tree-file-"][data-testid$="-toggle"]')
-    contentTestId: "working-diff-panel",
+    .filter({ visible: true })
+    .first();
+  await expect(changedFile).toBeVisible({ timeout: 30_000 });
+  await changedFile.click();
+  await expect(visibleTestId(page, "working-diff-panel").first()).toBeVisible({
+    timeout: 30_000,
   });
 }
 
 export async function openFilesPanel(page: Page): Promise<void> {
-  await openSidePanelView(page, {
+  await openExplorerView(page, {
-    tabTestId: "workspace-tab-files",
+    tabTestId: "explorer-sidebar-tab-files",
-    launchItemId: "files",
     contentTestId: "file-explorer-tree-scroll",
   });
 }
@@ -128,12 +129,10 @@ export async function openPullRequestPanel(page: Page): Promise<void> {
     await expect(visibleTestId(page, "pr-pane").first()).toBeVisible({ timeout: 15_000 });
     return;
   }
-  await openSidePanelView(page, {
+  const trigger = visibleTestId(page, "workspace-new-tab-button").first();
-    tabTestId: "workspace-tab-pull_request",
+  await trigger.click();
-    launchItemId: "pull-request",
+  await visibleTestId(page, "workspace-new-tab-menu-pull-request").first().click();
-    contentTestId: "pr-pane",
+  await expect(visibleTestId(page, "pr-pane").first()).toBeVisible({ timeout: 15_000 });
-    timeout: 15_000,
-  });
 }
 
 export async function waitForWorkspaceTabsVisible(page: Page): Promise<void> {

packages/app/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@getpaseo/app",
-  "version": "0.5.2",
+  "version": "0.6.0",
   "private": true,
   "main": "index.ts",
   "scripts": {
@@ -30,6 +30,7 @@
     "build:web": "npm --prefix ../.. run build:app-deps && expo export --platform web",
     "profile:composer-typing": "node ./scripts/profile-composer-typing.mjs",
     "profile:explorer-toggle": "node ./scripts/profile-explorer-toggle.mjs",
+    "profile:side-pane": "playwright test --config playwright.profile.config.ts side-pane-performance.spec.ts",
     "profile:workspace-switching": "node ./scripts/profile-workspace-switching.mjs",
     "profile:workspace-tabs": "node ./scripts/profile-workspace-tabs.mjs",
     "deploy:web": "npm run build:web && wrangler pages deploy dist --project-name paseo-app --branch main",

packages/app/perf/helpers/side-pane-performance.ts

@@ -0,0 +1,388 @@
+import { execFileSync } from "node:child_process";
+import { readFileSync } from "node:fs";
+import { resolve } from "node:path";
+import { expect, type Locator, type Page } from "@playwright/test";
+
+const APP_SETTINGS_KEY = "@paseo:app-settings";
+
+export interface ProfileTarget {
+  serverId: string;
+  workspaceId: string;
+}
+
+export interface RenderSummary {
+  id: string;
+  renders: number;
+  mounts: number;
+  updates: number;
+  actualDurationMs: number;
+  maximumActualDurationMs: number;
+}
+
+export interface InteractionMeasurement {
+  name: string;
+  latencyMs: number;
+  commits: number;
+  domMutations: number;
+  addedElements: number;
+  removedElements: number;
+  addedTestIds: string[];
+  removedTestIds: string[];
+  trackedNodes: Array<{
+    selector: string;
+    existedBefore: boolean;
+    connected: boolean;
+    sameNode: boolean;
+  }>;
+  renders: RenderSummary[];
+  reasons: Record<string, Record<string, number>>;
+  heapAfterGcBytes?: number;
+}
+
+interface BrowserMeasurementState {
+  startedAt: number;
+  selectors: string[];
+  originals: Array<Element | null>;
+  observer?: MutationObserver;
+  domMutations: number;
+  addedElements: number;
+  removedElements: number;
+  addedTestIds: Set<string>;
+  removedTestIds: Set<string>;
+}
+
+declare global {
+  interface Window {
+    __PASEO_SIDE_PANE_MEASUREMENT__?: BrowserMeasurementState;
+  }
+}
+
+function parseCliJson<T>(output: string): T {
+  const arrayStart = output.indexOf("[\n");
+  const objectStart = output.indexOf("{\n");
+  const start = arrayStart >= 0 ? arrayStart : objectStart;
+  if (start < 0) throw new Error(`Could not find JSON in CLI output: ${output}`);
+  return JSON.parse(output.slice(start)) as T;
+}
+
+export function resolveProfileTarget(): ProfileTarget {
+  const repoRoot = resolve(process.cwd(), "../..");
+  const serverId = (
+    process.env.PASEO_PROFILE_SERVER_ID ??
+    readFileSync(resolve(repoRoot, ".dev/paseo-home/server-id"), "utf8")
+  ).trim();
+  const requestedName = process.env.PASEO_PROFILE_WORKSPACE_NAME?.trim() || "Paseo";
+  const requestedWorkspaceId = process.env.PASEO_PROFILE_WORKSPACE_ID?.trim();
+  if (requestedWorkspaceId) return { serverId, workspaceId: requestedWorkspaceId };
+
+  const output = execFileSync("npm", ["run", "cli", "--", "workspace", "ls", "--json"], {
+    cwd: repoRoot,
+    encoding: "utf8",
+    env: { ...process.env, FORCE_COLOR: "0" },
+  });
+  const workspaces =
+    parseCliJson<Array<{ workspaceId: string; name: string; cwd: string }>>(output);
+  const workspace = workspaces.find(
+    (candidate) => candidate.name === requestedName && candidate.cwd === repoRoot,
+  );
+  if (!workspace) {
+    throw new Error(`No Paseo workspace named ${requestedName} points at ${repoRoot}`);
+  }
+  return { serverId, workspaceId: workspace.workspaceId };
+}
+
+export async function openProfileWorkspace(page: Page, target: ProfileTarget): Promise<void> {
+  await page.addInitScript(() => {
+    const preserveRenderProfile = (original: History["pushState"]) =>
+      function preserveProfileParam(
+        this: History,
+        state: unknown,
+        unused: string,
+        url?: string | URL | null,
+      ) {
+        if (url == null) return Reflect.apply(original, this, [state, unused, url]);
+        const nextUrl = new URL(String(url), location.href);
+        nextUrl.searchParams.set("renderProfile", "1");
+        return Reflect.apply(original, this, [
+          state,
+          unused,
+          `${nextUrl.pathname}${nextUrl.search}${nextUrl.hash}`,
+        ]);
+      };
+    history.pushState = preserveRenderProfile(history.pushState);
+    history.replaceState = preserveRenderProfile(history.replaceState);
+  });
+  await page.goto("/?renderProfile=1", { waitUntil: "domcontentloaded" });
+  const workspaceRow = page.getByTestId(
+    `sidebar-workspace-row-${target.serverId}:${target.workspaceId}`,
+  );
+  await expect(workspaceRow).toBeVisible({ timeout: 60_000 });
+  await workspaceRow.click();
+  await expect(
+    page.getByTestId("workspace-tabs-row").filter({ visible: true }).first(),
+  ).toBeVisible({
+    timeout: 60_000,
+  });
+  await expect(page.getByTestId("workspace-explorer-toggle").first()).toBeVisible();
+  await expect(page).toHaveURL(new RegExp(`/workspace/${target.workspaceId}\\?renderProfile=1$`));
+}
+
+export async function enableChangesOpenInSidePane(page: Page): Promise<void> {
+  await page.evaluate((settingsKey) => {
+    const persisted = JSON.parse(localStorage.getItem(settingsKey) ?? "{}") as Record<
+      string,
+      unknown
+    >;
+    const currentPreferences =
+      typeof persisted.openInSidePane === "object" && persisted.openInSidePane !== null
+        ? (persisted.openInSidePane as Record<string, unknown>)
+        : {};
+    localStorage.setItem(
+      settingsKey,
+      JSON.stringify({
+        ...persisted,
+        openInSidePane: { ...currentPreferences, explorerChanges: true },
+      }),
+    );
+  }, APP_SETTINGS_KEY);
+  await page.reload({ waitUntil: "domcontentloaded" });
+  await expect(
+    page.getByTestId("workspace-tabs-row").filter({ visible: true }).first(),
+  ).toBeVisible({
+    timeout: 60_000,
+  });
+}
+
+export async function openChangesExplorer(page: Page): Promise<void> {
+  const explorer = page.getByTestId("workspace-explorer-sidebar");
+  if ((await explorer.count()) === 0) {
+    await page.keyboard.press("Meta+e");
+  }
+  await expect(explorer).toBeVisible({ timeout: 30_000 });
+  const changesTab = explorer.getByRole("button", { name: /Working tree diff/i }).first();
+  await expect(changesTab).toBeVisible();
+  if ((await changesTab.getAttribute("aria-selected")) !== "true") {
+    await changesTab.click();
+  }
+  await expect(page.getByTestId("changes-tree-panel")).toBeVisible({ timeout: 30_000 });
+  await expect(changedFileRows(page).nth(1)).toBeVisible({ timeout: 30_000 });
+}
+
+export function changedFileRows(page: Page): Locator {
+  return page
+    .locator('[data-testid^="diff-tree-file-"][data-testid$="-toggle"]')
+    .filter({ visible: true });
+}
+
+export async function selectChangedFile(page: Page, index: number): Promise<void> {
+  const row = changedFileRows(page).nth(index);
+  await expect(row).toBeVisible();
+  await row.click();
+  await expect(row).toHaveAttribute("aria-selected", "true");
+}
+
+export async function expectWorkingDiffVisible(page: Page): Promise<void> {
+  await expect(page.getByTestId("working-diff-panel").filter({ visible: true })).toBeVisible({
+    timeout: 60_000,
+  });
+  await expect(page.getByTestId("git-diff-canvas").filter({ visible: true })).toBeVisible({
+    timeout: 60_000,
+  });
+}
+
+export async function closeWorkingDiffPane(page: Page): Promise<void> {
+  const tab = page.getByTestId("workspace-tab-working_diff").filter({ visible: true }).first();
+  await expect(tab).toBeVisible();
+  await tab.hover();
+  await page
+    .locator('[data-testid^="workspace-working-diff-close-"]')
+    .filter({ visible: true })
+    .first()
+    .click();
+  await expect(page.getByTestId("working-diff-panel").filter({ visible: true })).toHaveCount(0);
+}
+
+export async function measureHeapAfterGc(page: Page): Promise<number> {
+  await page.requestGC();
+  return page.evaluate(() => {
+    const memory = performance as Performance & {
+      memory?: { usedJSHeapSize: number };
+    };
+    return memory.memory?.usedJSHeapSize ?? 0;
+  });
+}
+
+async function waitForReactIdle(page: Page, quietMs = 250): Promise<void> {
+  let previousCount = -1;
+  let unchangedSince = Date.now();
+  const deadline = Date.now() + 15_000;
+  while (Date.now() < deadline) {
+    const count = await page.evaluate(() => globalThis.__PASEO_RENDER_PROFILE__?.length ?? 0);
+    if (count !== previousCount) {
+      previousCount = count;
+      unchangedSince = Date.now();
+    } else if (Date.now() - unchangedSince >= quietMs) {
+      return;
+    }
+    await page.waitForTimeout(25);
+  }
+  throw new Error("React profiler did not become idle");
+}
+
+function summarizeRenders(
+  samples: Array<{
+    id: string;
+    phase: "mount" | "update" | "nested-update";
+    actualDuration: number;
+  }>,
+): RenderSummary[] {
+  const summaries = new Map<string, RenderSummary>();
+  for (const sample of samples) {
+    const summary = summaries.get(sample.id) ?? {
+      id: sample.id,
+      renders: 0,
+      mounts: 0,
+      updates: 0,
+      actualDurationMs: 0,
+      maximumActualDurationMs: 0,
+    };
+    summary.renders += 1;
+    summary.mounts += sample.phase === "mount" ? 1 : 0;
+    summary.updates += sample.phase === "mount" ? 0 : 1;
+    summary.actualDurationMs += sample.actualDuration;
+    summary.maximumActualDurationMs = Math.max(
+      summary.maximumActualDurationMs,
+      sample.actualDuration,
+    );
+    summaries.set(sample.id, summary);
+  }
+  for (const summary of summaries.values()) {
+    summary.actualDurationMs = Math.round(summary.actualDurationMs * 100) / 100;
+    summary.maximumActualDurationMs = Math.round(summary.maximumActualDurationMs * 100) / 100;
+  }
+  return [...summaries.values()].sort(
+    (left, right) => right.actualDurationMs - left.actualDurationMs,
+  );
+}
+
+async function beginMeasurement(page: Page, selectors: string[]): Promise<void> {
+  await waitForReactIdle(page);
+  await page.evaluate((trackedSelectors) => {
+    globalThis.__PASEO_RESET_RENDER_PROFILE__?.();
+    const collectTestIds = (node: Node, output: Set<string>) => {
+      if (!(node instanceof Element)) return;
+      const ownTestId = node.getAttribute("data-testid");
+      if (ownTestId) output.add(ownTestId);
+      for (const element of node.querySelectorAll("[data-testid]")) {
+        const testId = element.getAttribute("data-testid");
+        if (testId) output.add(testId);
+      }
+    };
+    const state: BrowserMeasurementState = {
+      startedAt: performance.now(),
+      selectors: trackedSelectors,
+      originals: trackedSelectors.map((selector) => document.querySelector(selector)),
+      domMutations: 0,
+      addedElements: 0,
+      removedElements: 0,
+      addedTestIds: new Set(),
+      removedTestIds: new Set(),
+    };
+    state.observer = new MutationObserver((records) => {
+      state.domMutations += records.length;
+      for (const record of records) {
+        for (const node of record.addedNodes) {
+          state.addedElements +=
+            node instanceof Element ? 1 + node.querySelectorAll("*").length : 0;
+          collectTestIds(node, state.addedTestIds);
+        }
+        for (const node of record.removedNodes) {
+          state.removedElements +=
+            node instanceof Element ? 1 + node.querySelectorAll("*").length : 0;
+          collectTestIds(node, state.removedTestIds);
+        }
+      }
+    });
+    state.observer.observe(document.body, { childList: true, subtree: true });
+    window.__PASEO_SIDE_PANE_MEASUREMENT__ = state;
+  }, selectors);
+}
+
+async function finishMeasurement(page: Page, name: string): Promise<InteractionMeasurement> {
+  await page.evaluate(
+    () =>
+      new Promise<void>((resolveFrame) => {
+        requestAnimationFrame(() => requestAnimationFrame(() => resolveFrame()));
+      }),
+  );
+  await waitForReactIdle(page);
+  const raw = await page.evaluate((measurementName) => {
+    const state = window.__PASEO_SIDE_PANE_MEASUREMENT__;
+    if (!state) throw new Error("Side-pane performance measurement was not started");
+    state.observer?.disconnect();
+    const samples = globalThis.__PASEO_RENDER_PROFILE__ ?? [];
+    return {
+      name: measurementName,
+      latencyMs: Math.round((performance.now() - state.startedAt) * 100) / 100,
+      commits: new Set(samples.map((sample) => sample.commitTime)).size,
+      domMutations: state.domMutations,
+      addedElements: state.addedElements,
+      removedElements: state.removedElements,
+      addedTestIds: [...state.addedTestIds].sort(),
+      removedTestIds: [...state.removedTestIds].sort(),
+      trackedNodes: state.selectors.map((selector, index) => {
+        const original = state.originals[index] ?? null;
+        const current = document.querySelector(selector);
+        return {
+          selector,
+          existedBefore: original !== null,
+          connected: original?.isConnected ?? false,
+          sameNode: original !== null && original === current,
+        };
+      }),
+      samples,
+      reasons: globalThis.__PASEO_RENDER_PROFILE_REASONS__ ?? {},
+    };
+  }, name);
+  return {
+    ...raw,
+    renders: summarizeRenders(raw.samples),
+  };
+}
+
+export async function measureInteraction(
+  page: Page,
+  input: {
+    name: string;
+    trackedSelectors: string[];
+    interact: () => Promise<void>;
+    expectComplete: () => Promise<void>;
+  },
+): Promise<InteractionMeasurement> {
+  await beginMeasurement(page, input.trackedSelectors);
+  await input.interact();
+  await input.expectComplete();
+  return finishMeasurement(page, input.name);
+}
+
+export function expectTrackedNodePreserved(
+  measurement: InteractionMeasurement,
+  selector: string,
+): void {
+  const tracked = measurement.trackedNodes.find((candidate) => candidate.selector === selector);
+  expect.soft(tracked).toEqual({
+    selector,
+    existedBefore: true,
+    connected: true,
+    sameNode: true,
+  });
+}
+
+export function expectProfilerDidNotMount(
+  measurement: InteractionMeasurement,
+  idPrefix: string,
+): void {
+  const summaries = measurement.renders.filter((summary) => summary.id.startsWith(idPrefix));
+  expect.soft(summaries.length).toBeGreaterThan(0);
+  expect.soft(summaries.every((summary) => summary.mounts === 0)).toBe(true);
+}

packages/app/perf/side-pane-performance.spec.ts

@@ -0,0 +1,119 @@
+import { test, expect } from "@playwright/test";
+import {
+  changedFileRows,
+  closeWorkingDiffPane,
+  enableChangesOpenInSidePane,
+  expectProfilerDidNotMount,
+  expectTrackedNodePreserved,
+  expectWorkingDiffVisible,
+  measureInteraction,
+  measureHeapAfterGc,
+  openChangesExplorer,
+  openProfileWorkspace,
+  resolveProfileTarget,
+  selectChangedFile,
+  type InteractionMeasurement,
+} from "./helpers/side-pane-performance";
+
+const MAIN_PANE = '[data-testid="workspace-pane-main"]';
+const WORKING_DIFF = '[data-testid="working-diff-panel"]';
+const DIFF_CANVAS = '[data-testid="git-diff-canvas-root"]';
+const DIFF_TAB = '[data-testid="workspace-tab-working_diff"]';
+
+test("side-pane diff transitions preserve mounted work and report their real React cost", async ({
+  page,
+}, testInfo) => {
+  test.setTimeout(180_000);
+  const target = resolveProfileTarget();
+  const reports: InteractionMeasurement[] = [];
+
+  await test.step("open the real main workspace with Changes routed beside it", async () => {
+    await openProfileWorkspace(page, target);
+    await enableChangesOpenInSidePane(page);
+    await openChangesExplorer(page);
+    expect(await changedFileRows(page).count()).toBeGreaterThanOrEqual(2);
+  });
+
+  await test.step("creating the side pane keeps the main pane mounted", async () => {
+    const report = await measureInteraction(page, {
+      name: "create-side-pane",
+      trackedSelectors: [MAIN_PANE],
+      interact: () => selectChangedFile(page, 0),
+      expectComplete: () => expectWorkingDiffVisible(page),
+    });
+    reports.push(report);
+    await testInfo.attach(report.name, {
+      body: JSON.stringify(report, null, 2),
+      contentType: "application/json",
+    });
+    expectTrackedNodePreserved(report, MAIN_PANE);
+  });
+
+  await test.step("changing the selected diff file updates the existing diff in place", async () => {
+    const report = await measureInteraction(page, {
+      name: "change-diff-focus",
+      trackedSelectors: [MAIN_PANE, WORKING_DIFF, DIFF_CANVAS, DIFF_TAB],
+      interact: () => selectChangedFile(page, 1),
+      expectComplete: () => expectWorkingDiffVisible(page),
+    });
+    reports.push(report);
+    await testInfo.attach(report.name, {
+      body: JSON.stringify(report, null, 2),
+      contentType: "application/json",
+    });
+    expectTrackedNodePreserved(report, MAIN_PANE);
+    expectTrackedNodePreserved(report, WORKING_DIFF);
+    expectTrackedNodePreserved(report, DIFF_CANVAS);
+    expectTrackedNodePreserved(report, DIFF_TAB);
+    expectProfilerDidNotMount(report, "WorkingDiffPanel:");
+  });
+
+  await test.step("repeated cold reopenings measure retained workspace work", async () => {
+    for (let index = 0; index < 5; index += 1) {
+      await closeWorkingDiffPane(page);
+      const report = await measureInteraction(page, {
+        name: `reopen-side-pane-${index + 1}`,
+        trackedSelectors: [MAIN_PANE],
+        interact: () => selectChangedFile(page, index % 2),
+        expectComplete: () => expectWorkingDiffVisible(page),
+      });
+      report.heapAfterGcBytes = await measureHeapAfterGc(page);
+      reports.push(report);
+      await testInfo.attach(report.name, {
+        body: JSON.stringify(report, null, 2),
+        contentType: "application/json",
+      });
+      expectTrackedNodePreserved(report, MAIN_PANE);
+      expect(
+        report.renders.some(
+          (summary) => summary.id.startsWith("WorkingDiffPanel:") && summary.mounts > 0,
+        ),
+      ).toBe(true);
+    }
+  });
+
+  const artifact = {
+    appUrl: testInfo.project.use.baseURL,
+    target,
+    reports,
+  };
+  await testInfo.attach("side-pane-performance", {
+    body: JSON.stringify(artifact, null, 2),
+    contentType: "application/json",
+  });
+  console.log(
+    `[perf] Side pane: ${JSON.stringify(
+      reports.map((report) => ({
+        name: report.name,
+        latencyMs: report.latencyMs,
+        commits: report.commits,
+        domMutations: report.domMutations,
+        addedElements: report.addedElements,
+        removedElements: report.removedElements,
+        heapAfterGcBytes: report.heapAfterGcBytes,
+        trackedNodes: report.trackedNodes,
+        renders: report.renders.slice(0, 8),
+      })),
+    )}`,
+  );
+});

packages/app/playwright.config.ts

@@ -6,6 +6,12 @@ const baseURL =
   process.env.E2E_BASE_URL ?? `http://localhost:${process.env.E2E_METRO_PORT ?? "8081"}`;
 const relayDeploymentSpec = "**/relay-deployment-reconnect.real.spec.ts";
 
+function videoMode(): "on" | "on-first-retry" | "retain-on-failure" {
+  if (process.env.E2E_RECORD_VIDEO === "1") return "on";
+  if (process.env.CI) return "on-first-retry";
+  return "retain-on-failure";
+}
+
 export default defineConfig({
   testDir: "./e2e/browser",
   globalSetup: "./e2e/support/global-setup.ts",
@@ -21,9 +27,9 @@ export default defineConfig({
   reporter: [["list"]],
   use: {
     baseURL,
-    trace: "retain-on-failure",
+    trace: process.env.CI ? "on-first-retry" : "retain-on-failure",
     screenshot: "only-on-failure",
-    video: process.env.E2E_RECORD_VIDEO === "1" ? "on" : "retain-on-failure",
+    video: videoMode(),
   },
   projects: [
     {

packages/app/playwright.profile.config.ts

@@ -0,0 +1,18 @@
+import { defineConfig, devices } from "@playwright/test";
+
+export default defineConfig({
+  testDir: "./perf",
+  timeout: 120_000,
+  expect: { timeout: 30_000 },
+  fullyParallel: false,
+  workers: 1,
+  retries: 0,
+  reporter: [["list"]],
+  use: {
+    ...devices["Desktop Chrome"],
+    baseURL: process.env.PASEO_PROFILE_APP_URL ?? "http://127.0.0.1:8081",
+    viewport: { width: 1440, height: 900 },
+    trace: "retain-on-failure",
+    screenshot: "only-on-failure",
+  },
+});

packages/app/src/agent-stream/view.tsx

@@ -27,7 +27,7 @@ import { useMutation } from "@tanstack/react-query";
 import Animated, { FadeIn, FadeOut } from "react-native-reanimated";
 import { Check, ChevronDown, X } from "lucide-react-native";
 import { buildWorkspaceTabPersistenceKey } from "@/workspace-tabs/model";
-import { openSidePanelView } from "@/workspace-tabs/side-panel";
+import { openExplorerSidebarView } from "@/workspace-tabs/explorer-sidebar";
 import {
   AssistantMessage,
   SpeakMessage,
@@ -457,7 +457,7 @@ const AgentStreamViewComponent = forwardRef<AgentStreamViewHandle, AgentStreamVi
           setCurrentPath: false,
         });
 
-        openSidePanelView({
+        openExplorerSidebarView({
           isCompact: isMobile,
           workspaceKey: buildWorkspaceTabPersistenceKey({
             serverId: resolvedServerId,
@@ -474,7 +474,7 @@ const AgentStreamViewComponent = forwardRef<AgentStreamViewHandle, AgentStreamVi
     );
 
     const handleToolCallOpenFile = useStableEvent((filePath: string) => {
-      handleInlinePathPress({ raw: filePath, path: filePath }, "side");
+      handleInlinePathPress({ raw: filePath, path: filePath }, "preferred");
     });
 
     const handleForkAssistantTurn: AssistantTurnForkHandler = useStableEvent(

packages/app/src/app/_layout.tsx

@@ -36,6 +36,7 @@ import { KeyboardShortcutsDialog } from "@/components/keyboard-shortcuts-dialog"
 import { AppDiagnosticHost } from "@/components/app-diagnostic-host";
 import { LeftSidebar } from "@/components/left-sidebar";
 import { WindowSidebarMenuToggle } from "@/components/headers/menu-header";
+import { DesktopWindowControls } from "@/components/desktop/window-controls";
 import { SidebarModelProvider } from "@/components/sidebar/sidebar-model";
 import { WorkspacePinShortcutHandler } from "@/components/workspace-pin-shortcut-handler";
 import { CompactExplorerSidebarHost } from "@/components/compact-explorer-sidebar-host";
@@ -76,7 +77,7 @@ import { AgentNavigationListener } from "@/desktop/agent-navigation";
 import { LegacyAgentSkillsMigration } from "@/agent-skills/legacy-migration";
 import { legacyFavoriteProfileMigration } from "@/agent-profiles/migration";
 import { listenToDesktopEvent } from "@/desktop/electron/events";
-import { updateDesktopWindowControls } from "@/desktop/electron/window";
+import { updateDesktopWindowChrome } from "@/desktop/electron/window";
 import { getDesktopHost } from "@/desktop/host";
 import { loadDesktopSettings } from "@/desktop/settings/desktop-settings";
 import { RosettaCalloutSource } from "@/desktop/updates/rosetta-callout-source";
@@ -86,6 +87,7 @@ import { useGlobalNewWorkspaceAction } from "@/hooks/use-global-new-workspace-ac
 import { useLatchedBoolean } from "@/hooks/use-latched-boolean";
 import { useFaviconStatus } from "@/hooks/use-favicon-status";
 import { useKeyboardShortcuts } from "@/hooks/use-keyboard-shortcuts";
+import { resolveExplorerSidebarPresentation } from "@/workspace-tabs/explorer-sidebar";
 import { KeyboardShiftProvider } from "@/hooks/use-keyboard-shift-style";
 import { useCompactWebViewportZoomLock } from "@/hooks/use-compact-web-viewport-zoom-lock";
 import { useOpenProject } from "@/hooks/use-open-project";
@@ -473,6 +475,10 @@ function AppContainer({ children, chromeEnabled: chromeEnabledOverride }: AppCon
   }, [settings.theme, updateSettings]);
 
   const isCompactLayout = useIsCompactFormFactor();
+  const explorerSidebarPresentation = resolveExplorerSidebarPresentation({
+    isCompact: isCompactLayout,
+  });
+  const usesCompactExplorerHost = explorerSidebarPresentation !== "pane";
   useCompactWebViewportZoomLock(isCompactLayout);
   const pathname = usePathname();
   const isWorkspaceRoute = parseHostWorkspaceRouteFromPathname(pathname) !== null;
@@ -545,8 +551,11 @@ function AppContainer({ children, chromeEnabled: chromeEnabledOverride }: AppCon
           {sidebarChrome}
         </WindowChromeRegion>
       ) : null}
-      {isCompactLayout ? (
+      {usesCompactExplorerHost ? (
-        <CompactExplorerSidebarHost enabled={chromeEnabled}>
+        <CompactExplorerSidebarHost
+          enabled={chromeEnabled}
+          presentation={explorerSidebarPresentation === "dock" ? "dock" : "overlay"}
+        >
           <WindowChromeRegion corners={chromeEnabled ? "both" : appChromeLayout.contentCorners}>
             <View style={flexStyle}>{children}</View>
           </WindowChromeRegion>
@@ -574,6 +583,7 @@ function AppContainer({ children, chromeEnabled: chromeEnabledOverride }: AppCon
           </WindowChromeSafeArea>
         </WindowChromeRegion>
       ) : null}
+      <DesktopWindowControls />
       <FloatingPanelPortalHost />
       {isCompactLayout ? sidebarChrome : null}
       <DownloadToast />
@@ -665,18 +675,16 @@ function DesktopWindowControlsSync() {
   const { isLoading } = useAppSettings();
   const { theme } = useUnistyles();
   const surface0 = theme.colors.surface0;
-  const foreground = theme.colors.foreground;
 
   useEffect(() => {
     if (isLoading || isNative) return;
-    void updateDesktopWindowControls({
+    void updateDesktopWindowChrome({
       backgroundColor: surface0,
-      foregroundColor: foreground,
+      trafficLightOffsetY: -4,
-      trafficLightOffsetY: -5,
     }).catch((error) => {
       console.warn("[DesktopWindow] Failed to update window controls overlay", error);
     });
-  }, [isLoading, surface0, foreground]);
+  }, [isLoading, surface0]);
 
   return null;
 }

packages/app/src/assistant-file-links/use-file-link.test.tsx

@@ -176,7 +176,7 @@ describe("useFileLink", () => {
             lineStart: undefined,
             lineEnd: undefined,
           },
-          disposition: "side",
+          disposition: "preferred",
         },
       ]);
     });

packages/app/src/assistant-file-links/use-file-link.ts

@@ -117,7 +117,7 @@ export function useFileLink(source: AssistantFileLinkSource): UseFileLinkResult
   });
 
   const onPress = useStableEvent(() => {
-    open(stableSource, "side");
+    open(stableSource, "preferred");
   });
 
   const target = useMemo(() => {

packages/app/src/command-center/command-center.tsx

@@ -58,8 +58,10 @@ import { shortenPath } from "@/utils/shorten-path";
 import { useCommandCenterContributions } from "./provider";
 import {
   buildContributionSections,
+  filterAndRankBuiltInResults,
   joinSubtitleParts,
   moveActiveResultId,
+  PINNED_SECTION_BAND,
   preserveActiveResultId,
   projectCommandCenterRows,
   type CommandCenterAgentResult,
@@ -67,6 +69,7 @@ import {
   type CommandCenterListRow,
   type CommandCenterResult,
   type CommandCenterResultSection,
+  type CommandCenterSearchFields,
   type CommandCenterWorkspaceResult,
 } from "./results";
 import { useWorkspaceFileSearch } from "./workspace-file-search";
@@ -88,7 +91,6 @@ const ThemedLoadingSpinner = withUnistyles(LoadingSpinner, (theme) => ({
 }));
 const COMMAND_CENTER_SNAP_POINTS = ["60%", "90%"];
 const KEYBOARD_SHOULD_PERSIST_TAPS = "always" as const;
-const DEFAULT_CATEGORY_RESULT_LIMIT = 5;
 
 function sortAgents(left: AggregatedAgent, right: AggregatedAgent): number {
   const leftNeedsInput = (left.pendingPermissionCount ?? 0) > 0 ? 1 : 0;
@@ -103,41 +105,59 @@ function sortAgents(left: AggregatedAgent, right: AggregatedAgent): number {
   return right.lastActivityAt.getTime() - left.lastActivityAt.getTime();
 }
 
-function matchesQuery(searchText: string, query: string): boolean {
+function compareWorkspacesByTitle(
-  const normalized = query.trim().toLowerCase();
+  left: CommandCenterWorkspaceResult,
-  return !normalized || searchText.includes(normalized);
+  right: CommandCenterWorkspaceResult,
+): number {
+  const titleDelta = left.title.localeCompare(right.title, undefined, {
+    numeric: true,
+    sensitivity: "base",
+  });
+  return titleDelta || left.subtitle.localeCompare(right.subtitle);
 }
 
-function limitDefaultCategoryResults<Result>(results: Result[], query: string): Result[] {
+/** `cwd` is not rendered, so a path match must never outrank a match on text the user can see. */
-  return query.trim() ? results : results.slice(0, DEFAULT_CATEGORY_RESULT_LIMIT);
+function agentSearchFields(result: CommandCenterAgentResult): CommandCenterSearchFields {
+  return { visible: [result.title, result.subtitle], hidden: [result.agent.cwd] };
 }
 
-function useBuiltInSections(open: boolean, query: string): CommandCenterResultSection[] {
+function workspaceSearchFields(result: CommandCenterWorkspaceResult): CommandCenterSearchFields {
+  return { visible: [result.title, result.subtitle], hidden: [] };
+}
+
+/**
+ * Build every pinned row, in its default order. Deliberately not keyed on `query`: none of this
+ * work depends on what was typed, and rebuilding it per keystroke means re-running an Intl
+ * collation sort over every workspace.
+ *
+ * The cost is that `formatTimeAgo` is baked into the agent subtitle here, so relative timestamps
+ * now refresh when agents or projects change rather than on every keystroke.
+ */
+function useBuiltInRows(open: boolean): {
+  workspaces: CommandCenterWorkspaceResult[];
+  agents: CommandCenterAgentResult[];
+} {
   const { t } = useTranslation();
   const { agents } = useAggregatedAgents();
   const { projects } = useProjects({ enabled: open });
   const showHost = useHosts().length > 1;
 
   return useMemo(() => {
-    if (!open) return [];
+    if (!open) return { workspaces: [], agents: [] };
     const allWorkspaces: CommandCenterWorkspaceResult[] = [];
     for (const project of projects) {
       for (const host of project.hosts) {
         for (const workspace of host.workspaces) {
           if (workspace.archivingAt) continue;
-          const title = workspace.title ?? workspace.name;
-          const subtitle = joinSubtitleParts([
-            showHost ? host.serverName : null,
-            project.projectName,
-            workspace.currentBranch,
-          ]);
-          const searchText = `${title} ${subtitle}`.toLowerCase();
           allWorkspaces.push({
             kind: "workspace",
             id: `workspace:${host.serverId}:${workspace.id}`,
-            title,
+            title: workspace.title ?? workspace.name,
-            subtitle,
+            subtitle: joinSubtitleParts([
-            searchText,
+              showHost ? host.serverName : null,
+              project.projectName,
+              workspace.currentBranch,
+            ]),
             run: () => {
               clearCommandCenterFocusRestoreElement();
               navigateToWorkspace({ serverId: host.serverId, workspaceId: workspace.id });
@@ -146,60 +166,66 @@ function useBuiltInSections(open: boolean, query: string): CommandCenterResultSe
         }
       }
     }
-    allWorkspaces.sort((left, right) => {
+    allWorkspaces.sort(compareWorkspacesByTitle);
-      const titleDelta = left.title.localeCompare(right.title, undefined, {
-        numeric: true,
-        sensitivity: "base",
-      });
-      return titleDelta || left.subtitle.localeCompare(right.subtitle);
-    });
     const workspaceTitleByKey = new Map(
       allWorkspaces.map((workspace) => [workspace.id.slice("workspace:".length), workspace.title]),
     );
-    const workspaces = limitDefaultCategoryResults(
+    const agentRows = agents
-      allWorkspaces.filter((workspace) => matchesQuery(workspace.searchText, query)),
+      .map<CommandCenterAgentResult>((agent) => {
-      query,
+        const workspaceTitle = agent.workspaceId
-    );
+          ? workspaceTitleByKey.get(`${agent.serverId}:${agent.workspaceId}`)
-    const agentResults = limitDefaultCategoryResults(
+          : undefined;
-      agents
+        return {
-        .map<CommandCenterAgentResult>((agent) => {
+          kind: "agent",
-          const title = agent.title || t("shell.commandCenter.newAgent");
+          id: `agent:${agent.serverId}:${agent.id}`,
-          const workspaceTitle = agent.workspaceId
+          agent,
-            ? workspaceTitleByKey.get(`${agent.serverId}:${agent.workspaceId}`)
+          title: agent.title || t("shell.commandCenter.newAgent"),
-            : undefined;
+          subtitle: joinSubtitleParts([
-          const location = workspaceTitle ?? shortenPath(agent.cwd);
-          const subtitle = joinSubtitleParts([
             showHost ? agent.serverLabel : null,
-            location,
+            workspaceTitle ?? shortenPath(agent.cwd),
             formatTimeAgo(agent.lastActivityAt),
-          ]);
+          ]),
-          return {
+          run: () => {
-            kind: "agent",
+            clearCommandCenterFocusRestoreElement();
-            id: `agent:${agent.serverId}:${agent.id}`,
+            navigateToAgent({ serverId: agent.serverId, agentId: agent.id });
-            agent,
+          },
-            title,
+        };
-            subtitle,
+      })
-            searchText: `${title} ${subtitle} ${agent.cwd}`.toLowerCase(),
+      .sort((left, right) => sortAgents(left.agent, right.agent));
-            run: () => {
+    return { workspaces: allWorkspaces, agents: agentRows };
-              clearCommandCenterFocusRestoreElement();
+  }, [agents, open, projects, showHost, t]);
-              navigateToAgent({ serverId: agent.serverId, agentId: agent.id });
+}
-            },
+
-          };
+function useBuiltInSections(open: boolean, query: string): CommandCenterResultSection[] {
-        })
+  const { t } = useTranslation();
-        .filter((agent) => matchesQuery(agent.searchText, query))
+  const rows = useBuiltInRows(open);
-        .sort((left, right) => sortAgents(left.agent, right.agent)),
+
-      query,
+  return useMemo(() => {
-    );
+    if (!open) return [];
     return [
       {
         id: "workspaces",
+        band: PINNED_SECTION_BAND,
         rank: 2,
         title: t("shell.commandCenter.workspaces"),
-        results: workspaces,
+        results: filterAndRankBuiltInResults(
+          rows.workspaces,
+          query,
+          workspaceSearchFields,
+          compareWorkspacesByTitle,
+        ),
+      },
+      {
+        id: "agents",
+        band: PINNED_SECTION_BAND,
+        rank: 3,
+        title: t("shell.commandCenter.agents"),
+        results: filterAndRankBuiltInResults(rows.agents, query, agentSearchFields, (left, right) =>
+          sortAgents(left.agent, right.agent),
+        ),
       },
-      { id: "agents", rank: 3, title: t("shell.commandCenter.agents"), results: agentResults },
     ];
-  }, [agents, open, projects, query, showHost, t]);
+  }, [open, query, rows, t]);
 }
 
 interface CommandCenterState {
@@ -231,7 +257,7 @@ function useCommandCenterState(): CommandCenterState {
   const snapshot = useCommandCenterContributions();
   const inputRef = useRef<EditingTextInputHandle>(null);
   const previousOpenRef = useRef(open);
-  const [query, setQuery] = useState("");
+  const [query, setQueryState] = useState("");
   const [activeId, setActiveId] = useState<string | null>(null);
   const builtInSections = useBuiltInSections(open, query);
   const {
@@ -250,10 +276,20 @@ function useCommandCenterState(): CommandCenterState {
       filePath: entry.path,
       title: entry.name,
       subtitle: entry.directory,
-      searchText: entry.path.toLowerCase(),
       run: () => openFile(entry.path),
     }));
-    return [{ id: "files", rank: 4, title: t("shell.commandCenter.files"), results }];
+    // File rows are matched by the daemon, so they carry no client-side score and cannot be
+    // relevance-compared against the rows that do. Pinning them keeps the section comparator
+    // total: band is decided before any score is read.
+    return [
+      {
+        id: "files",
+        band: PINNED_SECTION_BAND,
+        rank: 4,
+        title: t("shell.commandCenter.files"),
+        results,
+      },
+    ];
   }, [fileSearchEntries, openFile, t]);
   const contributionSections = useMemo(
     () => buildContributionSections(snapshot.contributions, query),
@@ -270,6 +306,14 @@ function useCommandCenterState(): CommandCenterState {
   );
   const resolvedActiveId = preserveActiveResultId(activeId, projection.selectableResults);
 
+  // Editing the query re-ranks everything, so an arrow-key selection made under the previous
+  // query is no longer meaningful. Reset it in the same update as the query rather than in an
+  // effect, so there is no intermediate render holding the stale selection.
+  const setQuery = useCallback((next: string) => {
+    setQueryState(next);
+    setActiveId(null);
+  }, []);
+
   const close = useCallback(() => setOpen(false), [setOpen]);
   const select = useCallback(
     (result: CommandCenterResult) => {
@@ -312,7 +356,7 @@ function useCommandCenterState(): CommandCenterState {
       const timer = setTimeout(() => inputRef.current?.focus(), 0);
       return () => clearTimeout(timer);
     }
-    setQuery("");
+    setQueryState("");
     setActiveId(null);
     if (!wasOpen) return;
     const element = takeCommandCenterFocusRestoreElement();

packages/app/src/command-center/results.test.ts

@@ -2,8 +2,10 @@ import { describe, expect, it } from "vitest";
 import type { CommandCenterContribution } from "./contributions";
 import {
   buildContributionSections,
+  filterAndRankBuiltInResults,
   joinSubtitleParts,
   moveActiveResultId,
+  PINNED_SECTION_BAND,
   preserveActiveResultId,
   projectCommandCenterRows,
   type CommandCenterWorkspaceResult,
@@ -29,17 +31,80 @@ function contribution(input: {
   };
 }
 
-function workspace(id: string): CommandCenterWorkspaceResult {
+function action(input: {
+  id: string;
+  group: string;
+  groupRank: number;
+  rank?: number;
+  title: string;
+  subtitle?: string;
+  keywords?: readonly string[];
+  visibility?: "always" | "query";
+}): CommandCenterContribution {
   return {
-    kind: "workspace",
+    id: input.id,
-    id,
+    group: input.group,
-    title: id,
+    groupRank: input.groupRank,
-    subtitle: "host",
+    rank: input.rank ?? 0,
-    searchText: id,
+    keywords: input.keywords ?? [],
+    visibility: input.visibility ?? "always",
     run: () => undefined,
+    presentation: {
+      kind: "action",
+      title: input.title,
+      subtitle: input.subtitle,
+      sectionTitle: input.group,
+    },
   };
 }
 
+function choice(input: {
+  id: string;
+  group: string;
+  groupRank: number;
+  rank?: number;
+  path: readonly [string, ...string[]];
+  keywords?: readonly string[];
+}): CommandCenterContribution {
+  return {
+    id: input.id,
+    group: input.group,
+    groupRank: input.groupRank,
+    rank: input.rank ?? 0,
+    keywords: input.keywords ?? [],
+    visibility: "query",
+    run: () => undefined,
+    presentation: { kind: "choice", path: input.path, selected: false },
+  };
+}
+
+/** The real Actions › Schedules contribution, shape-for-shape (root-registration.tsx). */
+function schedulesAction(): CommandCenterContribution {
+  return action({
+    id: "schedules",
+    group: "actions",
+    groupRank: 0,
+    rank: 4,
+    title: "Schedules",
+    keywords: ["schedules", "scheduled", "automation", "recurring"],
+  });
+}
+
+/** The real Mode › Auto mode contribution, shape-for-shape (agent-control-contributions.ts). */
+function autoModeChoice(): CommandCenterContribution {
+  return choice({
+    id: "mode:auto",
+    group: "modes",
+    groupRank: 1.2,
+    path: ["Mode", "Auto mode"],
+    keywords: ["access", "permission", "approval", "mode"],
+  });
+}
+
+function workspace(id: string, title = id, subtitle = "host"): CommandCenterWorkspaceResult {
+  return { kind: "workspace", id, title, subtitle, run: () => undefined };
+}
+
 function sectionResultIds(sections: ReturnType<typeof buildContributionSections>): string[] {
   const ids: string[] = [];
   for (const section of sections) {
@@ -60,7 +125,13 @@ describe("Command Center result projection", () => {
     const sections = buildContributionSections(contributions, "o");
     const projection = projectCommandCenterRows([
       ...sections,
-      { id: "workspaces", rank: 2, title: "Workspaces", results: [workspace("workspace:1")] },
+      {
+        id: "workspaces",
+        band: PINNED_SECTION_BAND,
+        rank: 2,
+        title: "Workspaces",
+        results: [workspace("workspace:1")],
+      },
     ]);
     expect(projection.rows.map((row) => row.key)).toEqual([
       "section:models",
@@ -100,7 +171,13 @@ describe("Command Center result projection", () => {
   it("keeps keyboard selection aligned with rows beyond the render window", () => {
     const workspaces = Array.from({ length: 200 }, (_, index) => workspace(`workspace:${index}`));
     const projection = projectCommandCenterRows([
-      { id: "workspaces", rank: 0, title: "Workspaces", results: workspaces },
+      {
+        id: "workspaces",
+        band: PINNED_SECTION_BAND,
+        rank: 0,
+        title: "Workspaces",
+        results: workspaces,
+      },
     ]);
 
     let activeId: string | null = workspaces[0].id;
@@ -115,6 +192,320 @@ describe("Command Center result projection", () => {
   });
 });
 
+describe("Command Center relevance ordering", () => {
+  it("ranks a label match above a hidden-keyword match at every prefix", () => {
+    // Reported bug: "Schedules" matched only via its hidden keyword "automation" yet outranked
+    // "Auto mode", so Enter navigated to Schedules instead of switching permission mode.
+    // Every prefix counts, not just the full word — you read the list while you type, and "aut"
+    // is a string-prefix of both "Auto mode" and "automation", so match quality alone ties them.
+    for (const query of ["a", "au", "aut", "auto"]) {
+      const sections = buildContributionSections([schedulesAction(), autoModeChoice()], query);
+      expect(
+        sections.map((section) => section.id),
+        `query ${query}`,
+      ).toEqual(["modes", "actions"]);
+      expect(sectionResultIds(sections), `query ${query}`).toEqual(["mode:auto", "schedules"]);
+    }
+  });
+
+  it("prefers a visible label over an exact hidden keyword", () => {
+    const sections = buildContributionSections(
+      [
+        action({
+          id: "schedules",
+          group: "actions",
+          groupRank: 0,
+          rank: 0,
+          title: "Schedules",
+          keywords: ["automation"],
+        }),
+        action({
+          id: "automation-hub",
+          group: "actions",
+          groupRank: 0,
+          rank: 1,
+          title: "Automation hub",
+        }),
+      ],
+      "automation",
+    );
+
+    // "automation" is an exact keyword on Schedules and only a prefix of the other label.
+    // The visible match still wins — the deliberate trade-off of ranking by field role first.
+    expect(sectionResultIds(sections)).toEqual(["automation-hub", "schedules"]);
+  });
+
+  it("keeps registry order when the query is empty", () => {
+    const shuffled = [
+      choice({ id: "mode:auto", group: "modes", groupRank: 1.2, path: ["Mode", "Auto mode"] }),
+      schedulesAction(),
+      action({ id: "new-agent", group: "workspace", groupRank: -1, title: "New agent" }),
+    ];
+    const projection = projectCommandCenterRows(buildContributionSections(shuffled, ""));
+
+    // Query-gated choices stay hidden; the rest fall back to groupRank, unchanged by this feature.
+    expect(projection.selectableResults.map((result) => result.id)).toEqual([
+      "new-agent",
+      "schedules",
+    ]);
+  });
+
+  it("still ranks Schedules first for 'sched'", () => {
+    const sections = buildContributionSections(
+      [
+        schedulesAction(),
+        choice({
+          id: "mode:auto",
+          group: "modes",
+          groupRank: 1.2,
+          path: ["Mode", "Auto mode"],
+          keywords: ["rescheduled"],
+        }),
+      ],
+      "sched",
+    );
+
+    expect(sectionResultIds(sections)).toEqual(["schedules", "mode:auto"]);
+  });
+
+  it("orders rows within a section by match quality", () => {
+    const sections = buildContributionSections(
+      [
+        action({ id: "reset", group: "actions", groupRank: 0, rank: 0, title: "Reset device" }),
+        action({ id: "settings", group: "actions", groupRank: 0, rank: 1, title: "Settings" }),
+      ],
+      "set",
+    );
+
+    // "Settings" is a prefix match; "Reset device" only matches mid-word.
+    expect(sectionResultIds(sections)).toEqual(["settings", "reset"]);
+  });
+
+  it("breaks an equal-score tie with registry order, not alphabetically", () => {
+    const sections = buildContributionSections(
+      [
+        action({ id: "z-first", group: "actions", groupRank: 0, rank: 0, title: "Auto one" }),
+        action({ id: "a-second", group: "actions", groupRank: 0, rank: 1, title: "Auto two" }),
+      ],
+      "auto",
+    );
+
+    expect(sectionResultIds(sections)).toEqual(["z-first", "a-second"]);
+  });
+
+  it("keeps Workspaces below contributions even on a perfect match", () => {
+    const projection = projectCommandCenterRows([
+      ...buildContributionSections([schedulesAction()], "auto"),
+      {
+        id: "workspaces",
+        band: PINNED_SECTION_BAND,
+        rank: 2,
+        title: "Workspaces",
+        results: [workspace("auto")],
+      },
+    ]);
+
+    expect(projection.selectableResults.map((result) => result.id)).toEqual(["schedules", "auto"]);
+  });
+
+  it("sorts sections handed to it out of order", () => {
+    const sections = buildContributionSections([schedulesAction(), autoModeChoice()], "auto");
+    const workspaces = {
+      id: "workspaces",
+      band: PINNED_SECTION_BAND,
+      rank: 2,
+      title: "Workspaces",
+      results: [workspace("auto")],
+    };
+    const projection = projectCommandCenterRows([workspaces, ...sections.toReversed()]);
+
+    expect(projection.selectableResults.map((result) => result.id)).toEqual([
+      "mode:auto",
+      "schedules",
+      "auto",
+    ]);
+  });
+
+  it("still matches a query spanning two fields", () => {
+    // Each token is scored against each field on its own, so "mode auto" lands one token in
+    // path[0] and one in path[1]. Order is not significant — the reverse matches too.
+    for (const query of ["mode auto", "auto mode"]) {
+      expect(sectionResultIds(buildContributionSections([autoModeChoice()], query)), query).toEqual(
+        ["mode:auto"],
+      );
+    }
+  });
+});
+
+describe("Command Center query tokenization", () => {
+  const labelAsDesign = () =>
+    action({
+      id: "label:design",
+      group: "workspace",
+      groupRank: 0,
+      title: "Label as Design",
+    });
+
+  it("matches a multi-token query in any order", () => {
+    // The reported bug: "design" found this row and "lab des" found nothing, because the whole
+    // query was tested as one substring.
+    for (const query of ["design", "lab des", "des lab", "Label as Design"]) {
+      expect(sectionResultIds(buildContributionSections([labelAsDesign()], query)), query).toEqual([
+        "label:design",
+      ]);
+    }
+  });
+
+  it("requires each token to be adjacent characters, not a subsequence", () => {
+    // Unlike the composer's slash-command list, where "/pasbab" finds "/paseo-babysit". Dropping
+    // the subsequence tier is what keeps "No matches" meaning no matches: this list preselects
+    // its first row, so a query that should find nothing must not put an action under Enter.
+    for (const query of ["labdes", "lbl", "lasdsgn"]) {
+      expect(sectionResultIds(buildContributionSections([labelAsDesign()], query)), query).toEqual(
+        [],
+      );
+    }
+  });
+
+  it("rejects the row when any single token matches nothing", () => {
+    expect(sectionResultIds(buildContributionSections([labelAsDesign()], "lab zzz"))).toEqual([]);
+  });
+
+  it("treats a repeated token as idempotent", () => {
+    // Each token is scored independently, so both find the same occurrence. Documented, not a bug.
+    expect(sectionResultIds(buildContributionSections([labelAsDesign()], "lab lab"))).toEqual([
+      "label:design",
+    ]);
+  });
+
+  it("never drops a row that the old substring filter would have matched", () => {
+    // Tokens hold no whitespace and the old haystack joined fields with a space, so any token
+    // found in that haystack lay entirely within one field. Tokenizing can only widen.
+    const rows = [labelAsDesign(), schedulesAction(), autoModeChoice()];
+    const haystack = (row: CommandCenterContribution): string =>
+      [
+        ...(row.presentation.kind === "action"
+          ? [row.presentation.title, row.presentation.subtitle ?? ""]
+          : row.presentation.path),
+        ...row.keywords,
+      ]
+        .join(" ")
+        .toLowerCase();
+
+    for (const query of ["design", "sched", "auto mode", "label as", "recurring", "mode"]) {
+      const substringMatches = rows
+        .filter((row) => haystack(row).includes(query.toLowerCase()))
+        .map((row) => row.id);
+      const tokenMatches = new Set(sectionResultIds(buildContributionSections(rows, query)));
+      for (const id of substringMatches) {
+        expect(tokenMatches.has(id), `${query} -> ${id}`).toBe(true);
+      }
+    }
+  });
+
+  it("matches one token against the title and another against the subtitle", () => {
+    const sections = buildContributionSections(
+      [
+        action({
+          id: "open-changes",
+          group: "workspace",
+          groupRank: 0,
+          title: "Open Changes",
+          subtitle: "Review the working tree",
+        }),
+      ],
+      "changes tree",
+    );
+
+    expect(sectionResultIds(sections)).toEqual(["open-changes"]);
+  });
+
+  it("ranks a visible match above one that only a hidden keyword reached", () => {
+    const sections = buildContributionSections(
+      [
+        action({
+          id: "hidden-only",
+          group: "actions",
+          groupRank: 0,
+          rank: 0,
+          title: "Unrelated",
+          keywords: ["label", "design"],
+        }),
+        labelAsDesign(),
+      ],
+      "lab des",
+    );
+
+    expect(sectionResultIds(sections)).toEqual(["label:design", "hidden-only"]);
+  });
+
+  it("returns everything for an empty or whitespace-only query", () => {
+    for (const query of ["", "   "]) {
+      expect(
+        sectionResultIds(buildContributionSections([labelAsDesign(), schedulesAction()], query)),
+        JSON.stringify(query),
+      ).toEqual(["label:design", "schedules"]);
+    }
+  });
+});
+
+describe("filterAndRankBuiltInResults", () => {
+  const visibleOnly = (row: CommandCenterWorkspaceResult) => ({
+    visible: [row.title, row.subtitle],
+    hidden: [],
+  });
+  const byTitle = (left: CommandCenterWorkspaceResult, right: CommandCenterWorkspaceResult) =>
+    left.title.localeCompare(right.title);
+
+  it("caps an empty query and preserves the caller's order", () => {
+    const rows = Array.from({ length: 8 }, (_, index) => workspace(`w${index}`));
+
+    expect(
+      filterAndRankBuiltInResults(rows, "", visibleOnly, byTitle).map((row) => row.id),
+    ).toEqual(["w0", "w1", "w2", "w3", "w4"]);
+  });
+
+  it("puts the best match first even when it sorts last alphabetically", () => {
+    const rows = [
+      workspace("a", "Zebra design system"),
+      workspace("b", "Alpha lab notes"),
+      workspace("c", "Label as Design"),
+    ];
+
+    // Alphabetically this is Alpha, Label, Zebra. "lab des" only matches Label as Design.
+    expect(
+      filterAndRankBuiltInResults(rows, "lab des", visibleOnly, byTitle).map((row) => row.id),
+    ).toEqual(["c"]);
+  });
+
+  it("ranks a title match above a match that only the hidden field reached", () => {
+    const rows = [workspace("hidden-hit", "Unrelated"), workspace("title-hit", "Deploy")];
+    const fields = (row: CommandCenterWorkspaceResult) =>
+      row.id === "hidden-hit"
+        ? { visible: [row.title], hidden: ["deploy"] }
+        : { visible: [row.title], hidden: [] };
+
+    expect(
+      filterAndRankBuiltInResults(rows, "deploy", fields, byTitle).map((row) => row.id),
+    ).toEqual(["title-hit", "hidden-hit"]);
+  });
+
+  it("breaks an equal score with the caller's tiebreak, not with match order", () => {
+    // Both titles are an exact prefix match for "task", so only the tiebreak separates them.
+    const rows = [workspace("second", "Task zebra"), workspace("first", "Task alpha")];
+
+    expect(
+      filterAndRankBuiltInResults(rows, "task", visibleOnly, byTitle).map((row) => row.id),
+    ).toEqual(["first", "second"]);
+  });
+
+  it("drops a row when one token matches nothing", () => {
+    const rows = [workspace("a", "Label as Design")];
+
+    expect(filterAndRankBuiltInResults(rows, "lab zzz", visibleOnly, byTitle)).toEqual([]);
+  });
+});
+
 describe("joinSubtitleParts", () => {
   it("joins all present parts with a middle dot", () => {
     expect(joinSubtitleParts(["a", "b", "c"])).toBe("a · b · c");

packages/app/src/command-center/results.ts

@@ -1,12 +1,53 @@
 import type { AggregatedAgent } from "@/hooks/use-aggregated-agents";
+import {
+  compareMatchScores,
+  type MatchScore,
+  scoreTextFields,
+} from "@getpaseo/protocol/search/text-match";
 import type { CommandCenterContribution } from "./contributions";
 
+/** Sections that reorder by how well they match the query. */
+export const CONTRIBUTION_SECTION_BAND = 0;
+/** Sections pinned below every contribution section regardless of match quality. */
+export const PINNED_SECTION_BAND = 1;
+
+/** Every query token matched something the user can read on the row. */
+const VISIBLE_FIELD_RANK = 0;
+/** At least one token only matched a hidden keyword. */
+const KEYWORD_FIELD_RANK = 1;
+
+export interface CommandCenterScore {
+  /** VISIBLE_FIELD_RANK or KEYWORD_FIELD_RANK. Compared before match quality. */
+  fieldRank: number;
+  match: MatchScore;
+}
+
+/**
+ * Rank by which fields matched before ranking by how well they matched. A row whose visible
+ * label matches always outranks one that only matches through a hidden keyword, however good
+ * the keyword match is.
+ *
+ * Scoring purely by tier is not enough: "aut" is a string-prefix of both "Auto mode" and
+ * Schedules' hidden keyword "automation", so the tiers tie and the order falls back to group
+ * rank, which puts Schedules first. It only came out right at the full word "auto". Order that
+ * flips mid-word as you type is worse than order that is merely wrong.
+ *
+ * The cost is deliberate: an exact hidden-keyword match now loses to any visible match. No
+ * query over the contributions registered today hits that case — hidden keywords here are
+ * synonyms nothing else displays ("automation", "recurring", "repo", "shell", "hotkeys").
+ */
+export function compareCommandCenterScores(
+  left: CommandCenterScore,
+  right: CommandCenterScore,
+): number {
+  return left.fieldRank - right.fieldRank || compareMatchScores(left.match, right.match);
+}
+
 export interface CommandCenterWorkspaceResult {
   kind: "workspace";
   id: string;
   title: string;
   subtitle: string;
-  searchText: string;
   run(): void;
 }
 
@@ -16,7 +57,6 @@ export interface CommandCenterAgentResult {
   agent: AggregatedAgent;
   title: string;
   subtitle: string;
-  searchText: string;
   run(): void;
 }
 
@@ -26,7 +66,6 @@ export interface CommandCenterFileResult {
   filePath: string;
   title: string;
   subtitle: string;
-  searchText: string;
   run(): void;
 }
 
@@ -34,7 +73,8 @@ export interface CommandCenterContributionResult {
   kind: "contribution";
   id: string;
   contribution: CommandCenterContribution;
-  searchText: string;
+  /** How well this row matches the query. Absent when the query is empty. */
+  score?: CommandCenterScore;
   run(): void | Promise<void>;
 }
 
@@ -46,15 +86,21 @@ export type CommandCenterResult =
 
 export interface CommandCenterResultSection {
   id: string;
+  /** CONTRIBUTION_SECTION_BAND or PINNED_SECTION_BAND. Compared before anything else. */
+  band: number;
   rank: number;
   title?: string;
+  /** Best score among this section's results. Absent when the query is empty. */
+  score?: CommandCenterScore;
   results: readonly CommandCenterResult[];
 }
 
 interface MutableCommandCenterResultSection {
   id: string;
+  band: number;
   rank: number;
   title?: string;
+  score?: CommandCenterScore;
   results: CommandCenterResult[];
 }
 
@@ -69,9 +115,41 @@ export interface CommandCenterListProjection {
   offsets: readonly number[];
 }
 
-function matchesQuery(searchText: string, query: string): boolean {
+/**
-  const normalized = query.trim().toLowerCase();
+ * Fields a row can be matched on, split by whether the user can read them. A row that matches
-  return !normalized || searchText.includes(normalized);
+ * only through `hidden` still matches, but always ranks below one whose `visible` text did.
+ */
+export interface CommandCenterSearchFields {
+  visible: readonly string[];
+  hidden: readonly string[];
+}
+
+const MATCH_OPTIONS = { subsequence: false } as const;
+
+/**
+ * The one definition of "how well did this row match", shared by every scored row kind. Null
+ * means the row is filtered out, so scoring and filtering are the same pass — a separate boolean
+ * predicate would throw this result away and force the token scan a second time.
+ *
+ * Matching is per-token (`scoreTextFields` splits on whitespace and every token must land in
+ * some field), so token order does not matter and `lab des` finds "Label as Design". This can
+ * only ever widen the result set: tokens hold no whitespace, so any token that was found in the
+ * old space-joined haystack lies entirely within one field and is still found here.
+ *
+ * Subsequence matching is off, unlike the composer's slash-command list. Each token has to be a
+ * run of adjacent characters, so `lab des` matches and `labdes` does not. It widens hard enough
+ * that almost any typo finds something, and this list preselects its first row: a query the user
+ * expects to find nothing would instead put an unrelated action under Enter.
+ */
+export function scoreSearchFields(
+  query: string,
+  fields: CommandCenterSearchFields,
+): CommandCenterScore | null {
+  const visible = scoreTextFields(query, [...fields.visible], MATCH_OPTIONS);
+  if (visible) return { fieldRank: VISIBLE_FIELD_RANK, match: visible };
+  if (fields.hidden.length === 0) return null;
+  const match = scoreTextFields(query, [...fields.visible, ...fields.hidden], MATCH_OPTIONS);
+  return match ? { fieldRank: KEYWORD_FIELD_RANK, match } : null;
 }
 
 /** Join non-empty subtitle parts with " · ", dropping null/undefined/empty. */
@@ -79,12 +157,18 @@ export function joinSubtitleParts(parts: readonly (string | null | undefined)[])
   return parts.filter((part): part is string => Boolean(part)).join(" · ");
 }
 
-function contributionSearchText(contribution: CommandCenterContribution): string {
+/**
-  const presentationText =
+ * Field order carries no meaning: every token is scored against each field on its own, so
+ * ["Mode", "Auto mode"] and its reverse both match "mode auto" and "auto mode".
+ */
+function contributionSearchFields(
+  contribution: CommandCenterContribution,
+): CommandCenterSearchFields {
+  const visible =
     contribution.presentation.kind === "action"
       ? [contribution.presentation.title, contribution.presentation.subtitle ?? ""]
-      : contribution.presentation.path;
+      : [...contribution.presentation.path];
-  return [...presentationText, ...contribution.keywords].join(" ").toLowerCase();
+  return { visible, hidden: contribution.keywords };
 }
 
 function resultHeight(result: CommandCenterResult): number {
@@ -96,17 +180,77 @@ function resultHeight(result: CommandCenterResult): number {
   return 36;
 }
 
+/**
+ * Order two sections. Total and transitive: the mixed case (one score present, one absent)
+ * cannot occur, because scores exist exactly on band-0 sections with a non-empty query, band is
+ * compared first so cross-band pairs never reach the score clause, and within band 0 either
+ * every section has a score or none does.
+ */
+function compareResultSections(
+  left: CommandCenterResultSection,
+  right: CommandCenterResultSection,
+): number {
+  if (left.band !== right.band) return left.band - right.band;
+  if (left.score && right.score) {
+    const delta = compareCommandCenterScores(left.score, right.score);
+    if (delta !== 0) return delta;
+  }
+  return left.rank - right.rank || left.id.localeCompare(right.id);
+}
+
+function resultScore(result: CommandCenterResult): CommandCenterScore | undefined {
+  return result.kind === "contribution" ? result.score : undefined;
+}
+
+/** Rows shown when nothing has been typed, per pinned category. */
+const DEFAULT_CATEGORY_RESULT_LIMIT = 5;
+
+/**
+ * Filter and rank already-built rows. Rows in, rows out — building them needs translations,
+ * navigation callbacks and the project tree, none of which matching cares about, so that stays
+ * with the caller and this stays testable without mounting React.
+ *
+ * `tiebreak` is the caller's own ordering (alphabetical for workspaces, status and recency for
+ * agents). It decides equal-scoring rows, so an agent awaiting input still outranks an idle one
+ * that matched exactly as well.
+ */
+export function filterAndRankBuiltInResults<Row>(
+  rows: readonly Row[],
+  query: string,
+  fieldsOf: (row: Row) => CommandCenterSearchFields,
+  tiebreak: (left: Row, right: Row) => number,
+): Row[] {
+  if (!query.trim()) return rows.slice(0, DEFAULT_CATEGORY_RESULT_LIMIT);
+
+  const scored: { row: Row; score: CommandCenterScore }[] = [];
+  for (const row of rows) {
+    const score = scoreSearchFields(query, fieldsOf(row));
+    if (score) scored.push({ row, score });
+  }
+  scored.sort(
+    (left, right) =>
+      compareCommandCenterScores(left.score, right.score) || tiebreak(left.row, right.row),
+  );
+  return scored.map((entry) => entry.row);
+}
+
 export function buildContributionSections(
   contributions: readonly CommandCenterContribution[],
   query: string,
 ): CommandCenterResultSection[] {
   const groups = new Map<string, MutableCommandCenterResultSection>();
+  const registryIndexById = new Map<string, number>();
   const hasQuery = Boolean(query.trim());
 
-  for (const contribution of contributions) {
+  for (const [index, contribution] of contributions.entries()) {
     if (contribution.visibility === "query" && !hasQuery) continue;
-    const searchText = contributionSearchText(contribution);
+    let score: CommandCenterScore | undefined;
-    if (!matchesQuery(searchText, query)) continue;
+    if (hasQuery) {
+      // The score is the filter: null means no token found a home, so the row is out.
+      const matched = scoreSearchFields(query, contributionSearchFields(contribution));
+      if (!matched) continue;
+      score = matched;
+    }
     const existing = groups.get(contribution.group);
     const title =
       contribution.presentation.kind === "action"
@@ -114,23 +258,39 @@ export function buildContributionSections(
         : undefined;
     const section = existing ?? {
       id: contribution.group,
+      band: CONTRIBUTION_SECTION_BAND,
       rank: contribution.groupRank,
       title,
       results: [],
     };
+    registryIndexById.set(contribution.id, index);
     section.results.push({
       kind: "contribution",
       id: contribution.id,
       contribution,
-      searchText,
+      score,
       run: contribution.run,
     });
+    if (score && (!section.score || compareCommandCenterScores(score, section.score) < 0)) {
+      section.score = score;
+    }
     groups.set(contribution.group, section);
   }
 
-  return [...groups.values()].sort(
+  const sections = [...groups.values()];
-    (left, right) => left.rank - right.rank || left.id.localeCompare(right.id),
+  // With no query there is nothing to rank by, so leave the registry order untouched.
-  );
+  if (!hasQuery) return sections;
+
+  for (const section of sections) {
+    section.results.sort((left, right) => {
+      const leftScore = resultScore(left);
+      const rightScore = resultScore(right);
+      const delta = leftScore && rightScore ? compareCommandCenterScores(leftScore, rightScore) : 0;
+      if (delta !== 0) return delta;
+      return (registryIndexById.get(left.id) ?? 0) - (registryIndexById.get(right.id) ?? 0);
+    });
+  }
+  return sections.sort(compareResultSections);
 }
 
 export function projectCommandCenterRows(
@@ -138,7 +298,7 @@ export function projectCommandCenterRows(
 ): CommandCenterListProjection {
   const populated = sections
     .filter((section) => section.results.length > 0)
-    .sort((left, right) => left.rank - right.rank || left.id.localeCompare(right.id));
+    .sort(compareResultSections);
   const rows: CommandCenterListRow[] = [];
   const selectableResults: CommandCenterResult[] = [];
   const rowIndexByResultId = new Map<string, number>();

packages/app/src/command-center/workspace-contributions.test.ts

@@ -61,9 +61,8 @@ function source(gitActions: GitActions): {
         moveTabUp: "Move tab up",
         moveTabDown: "Move tab down",
         closePane: "Close pane",
-        togglePaneMaximization: "Toggle pane maximization",
         toggleFocusMode: "Toggle focus mode",
-        toggleSidePanel: "Toggle side panel",
+        toggleExplorerSidebar: "Toggle side panel",
       },
       icons: {},
       shortcuts: {},

packages/app/src/command-center/workspace-contributions.ts

@@ -40,9 +40,8 @@ export interface WorkspaceCommandCenterLabels {
   moveTabUp: string;
   moveTabDown: string;
   closePane: string;
-  togglePaneMaximization: string;
   toggleFocusMode: string;
-  toggleSidePanel: string;
+  toggleExplorerSidebar: string;
 }
 
 export interface WorkspaceCommandCenterIcons {
@@ -62,9 +61,8 @@ export interface WorkspaceCommandCenterIcons {
   copy?: CommandCenterIcon;
   focusPane?: CommandCenterIcon;
   moveTab?: CommandCenterIcon;
-  maximize?: CommandCenterIcon;
   focusMode?: CommandCenterIcon;
-  sidePanel?: CommandCenterIcon;
+  explorerSidebar?: CommandCenterIcon;
   git?(action: GitAction): CommandCenterIcon | undefined;
 }
 
@@ -78,9 +76,8 @@ export interface WorkspaceCommandCenterShortcuts {
   nextTab?: ShortcutKey[][];
   closeCurrentTab?: ShortcutKey[][];
   closePane?: ShortcutKey[][];
-  togglePaneMaximization?: ShortcutKey[][];
   toggleFocusMode?: ShortcutKey[][];
-  toggleSidePanel?: ShortcutKey[][];
+  toggleExplorerSidebar?: ShortcutKey[][];
 }
 
 export interface WorkspaceCommandCenterSource {
@@ -198,7 +195,9 @@ function buildPanelContributions(
       }),
     );
     if (!source.capabilities.canSplitPanes) continue;
-    for (const [placementIndex, placement] of (["side-panel", "focused-pane"] as const).entries()) {
+    if (panel.target !== "pull-request") continue;
+    const placements = ["side-pane", "focused-pane"] as const;
+    for (const [placementIndex, placement] of placements.entries()) {
       contributions.push(
         buildQueryAction(source, {
           id: `tab:open:${panel.target}:${placement}`,
@@ -447,15 +446,6 @@ function buildPaneContributions(source: WorkspaceCommandCenterSource): CommandCe
       shortcutKeys: source.shortcuts.closePane,
       action: { id: "workspace.pane.close", scope: "workspace" },
     },
-    {
-      id: "pane:maximize-toggle",
-      rank: 61,
-      title: source.labels.togglePaneMaximization,
-      keywords: ["pane", "maximize", "restore", "toggle"],
-      icon: source.icons.maximize,
-      shortcutKeys: source.shortcuts.togglePaneMaximization,
-      action: { id: "workspace.explorer.maximize.toggle", scope: "workspace" },
-    },
     {
       id: "pane:focus-mode-toggle",
       rank: 62,
@@ -522,12 +512,12 @@ export function buildWorkspaceCommandCenterContributions(
     ...buildActiveTabContributions(source),
     ...(source.capabilities.canSplitPanes ? buildPaneContributions(source) : []),
     buildQueryAction(source, {
-      id: "side-panel:toggle",
+      id: "explorer-sidebar:toggle",
       rank: 70,
-      title: source.labels.toggleSidePanel,
+      title: source.labels.toggleExplorerSidebar,
-      keywords: ["side", "panel", "toggle", "show", "hide"],
+      keywords: ["explorer", "sidebar", "toggle", "show", "hide"],
-      icon: source.icons.sidePanel,
+      icon: source.icons.explorerSidebar,
-      shortcutKeys: source.shortcuts.toggleSidePanel,
+      shortcutKeys: source.shortcuts.toggleExplorerSidebar,
       action: { id: "sidebar.toggle.right", scope: "workspace" },
     }),
   ];

packages/app/src/command-center/workspace-file-search.ts

@@ -131,6 +131,7 @@ export function useWorkspaceFileSearch(input: { enabled: boolean; query: string
       openWorkspaceFileFromExplorer({
         filePath: path,
         persistenceKey: buildWorkspaceTabPersistenceKey({ serverId, workspaceId }),
+        closeExplorerAfterOpen: true,
         showMobileAgent: usePanelStore.getState().showMobileAgent,
         openWorkspaceTabInFocusedPane: (workspaceKey, target, placement) =>
           useWorkspaceLayoutStore.getState().openTab({

packages/app/src/command-center/workspace-registration.tsx

@@ -11,7 +11,6 @@ import {
   GitCompareArrows,
   GitPullRequest,
   Globe,
-  Maximize2,
   Move,
   PanelRight,
   Pencil,
@@ -64,14 +63,13 @@ const WORKSPACE_COMMAND_CENTER_ICONS = {
   copy: getCommandCenterIcon(Copy),
   focusPane: getCommandCenterIcon(Focus),
   moveTab: getCommandCenterIcon(Move),
-  maximize: getCommandCenterIcon(Maximize2),
   focusMode: getCommandCenterIcon(ArrowDownToLine),
-  sidePanel: getCommandCenterIcon(PanelRight),
+  explorerSidebar: getCommandCenterIcon(PanelRight),
 };
 
 const OPEN_PANEL_LABEL_KEYS = {
   supporting: "shell.commandCenter.open",
-  "side-panel": "shell.commandCenter.openInSidePanel",
+  "side-pane": "shell.commandCenter.openInSidePane",
   "focused-pane": "shell.commandCenter.openInFocusedPane",
 } as const;
 
@@ -152,9 +150,8 @@ export function useWorkspaceCommandCenterActions(): void {
           moveTabUp: t("settings.shortcuts.help.moveTabUp"),
           moveTabDown: t("settings.shortcuts.help.moveTabDown"),
           closePane: t("settings.shortcuts.help.closePane"),
-          togglePaneMaximization: t("settings.shortcuts.help.toggleExplorerPaneMaximization"),
           toggleFocusMode: t("settings.shortcuts.help.toggleFocusMode"),
-          toggleSidePanel: t("workspace.tabs.sidePanel.toggle"),
+          toggleExplorerSidebar: t("workspace.tabs.explorerSidebar.toggle"),
         },
         icons: {
           ...WORKSPACE_COMMAND_CENTER_ICONS,

packages/app/src/command-center/workspace-shortcuts.ts

@@ -31,9 +31,7 @@ export function resolveWorkspaceCommandCenterShortcuts({
       resolveShortcutKeysForAction("workspace-tab-close-current", overrides, platform) ?? undefined,
     closePane:
       resolveShortcutKeysForAction("workspace-pane-close", overrides, platform) ?? undefined,
-    togglePaneMaximization:
+    toggleExplorerSidebar:
-      resolveShortcutKeysForAction("workspace-explorer-maximize", overrides, platform) ?? undefined,
-    toggleSidePanel:
       resolveShortcutKeysForAction("toggle-right-sidebar", overrides, platform) ?? undefined,
   };
 }

packages/app/src/components/branch-switcher.tsx

@@ -1,7 +1,7 @@
 import { useCallback, useMemo, useRef } from "react";
-import { Pressable, Text, View, type PressableStateCallbackType } from "react-native";
+import { Text, View } from "react-native";
 import { useQueryClient } from "@tanstack/react-query";
-import { ChevronDown, GitBranch } from "lucide-react-native";
+import { GitBranch } from "lucide-react-native";
 import { StyleSheet, withUnistyles } from "react-native-unistyles";
 import { useTranslation } from "react-i18next";
 import type { Theme } from "@/styles/theme";
@@ -10,6 +10,7 @@ import { Tooltip, TooltipContent, TooltipTrigger } from "@/components/ui/tooltip
 import { useHostRuntimeClient, useHostRuntimeIsConnected } from "@/runtime/host-runtime";
 import { useToast } from "@/contexts/toast-context";
 import { useBranchSwitcher } from "@/hooks/use-branch-switcher";
+import { ToolbarLabelSelectTrigger } from "@/components/ui/toolbar-label-trigger";
 
 interface BranchSwitcherProps {
   currentBranchName: string | null;
@@ -23,9 +24,7 @@ interface BranchSwitcherProps {
 const foregroundMutedIconColorMapping = (theme: Theme) => ({
   color: theme.colors.foregroundMuted,
 });
-
 const ThemedGitBranch = withUnistyles(GitBranch);
-const ThemedChevronDown = withUnistyles(ChevronDown);
 
 export function BranchSwitcher({
   currentBranchName,
@@ -56,14 +55,6 @@ export function BranchSwitcher({
 
   const handleOpen = useCallback(() => setIsOpen(true), [setIsOpen]);
 
-  const triggerStyle = useCallback(
-    ({ hovered = false, pressed }: PressableStateCallbackType & { hovered?: boolean }) => [
-      styles.trigger,
-      (Boolean(hovered) || pressed) && styles.triggerHovered,
-    ],
-    [],
-  );
-
   const branchLeadingSlot = useMemo(
     () => <ThemedGitBranch size={14} uniProps={foregroundMutedIconColorMapping} />,
     [],
@@ -90,21 +81,16 @@ export function BranchSwitcher({
     <View ref={anchorRef} collapsable={false} style={styles.anchor}>
       <Tooltip delayDuration={300} enabledOnDesktop enabledOnMobile={false}>
         <TooltipTrigger asChild>
-          <Pressable
+          <ToolbarLabelSelectTrigger
             testID={testID}
+            label={currentBranchName}
+            open={isOpen}
             onPress={handleOpen}
-            style={triggerStyle}
             accessibilityRole="button"
             accessibilityLabel={t("branchSwitcher.currentBranch", {
               branchName: currentBranchName,
             })}
-          >
+          />
-            <ThemedGitBranch size={12} uniProps={foregroundMutedIconColorMapping} />
-            <Text style={styles.branchLabel} numberOfLines={1}>
-              {currentBranchName}
-            </Text>
-            <ThemedChevronDown size={12} uniProps={foregroundMutedIconColorMapping} />
-          </Pressable>
         </TooltipTrigger>
         <TooltipContent side="bottom">
           <Text style={styles.tooltipText}>{t("branchSwitcher.triggerTooltip")}</Text>
@@ -136,25 +122,6 @@ const styles = StyleSheet.create((theme) => ({
     flexShrink: 1,
     minWidth: 0,
   },
-  trigger: {
-    flexDirection: "row",
-    alignItems: "center",
-    gap: theme.spacing[1],
-    minWidth: 0,
-    paddingVertical: theme.spacing[1],
-    paddingHorizontal: theme.spacing[1],
-    borderRadius: theme.borderRadius.md,
-    flexShrink: 1,
-  },
-  triggerHovered: {
-    backgroundColor: theme.colors.surface1,
-  },
-  branchLabel: {
-    fontSize: theme.fontSize.sm,
-    color: theme.colors.foregroundMuted,
-    fontWeight: theme.fontWeight.normal,
-    flexShrink: 1,
-  },
   tooltipText: {
     color: theme.colors.popoverForeground,
     fontSize: theme.fontSize.sm,

packages/app/src/components/compact-explorer-sidebar-host.tsx

@@ -1,9 +1,12 @@
-import { type ReactNode, useCallback, useEffect, useMemo, useRef } from "react";
+import { type ReactNode, useCallback, useEffect, useMemo, useRef, useState } from "react";
-import { View } from "react-native";
+import { View, type LayoutChangeEvent } from "react-native";
 import { GestureDetector } from "react-native-gesture-handler";
 import { useActiveWorkspaceSelection } from "@/stores/navigation-active-workspace-store";
 import { useWorkspace } from "@/stores/session-store-hooks";
-import { CompactExplorerSidebar } from "@/components/compact-explorer-sidebar";
+import {
+  CompactExplorerSidebar,
+  NativeExplorerSidebarDock,
+} from "@/components/compact-explorer-sidebar";
 import { useOpenFileExplorerGesture } from "@/mobile-panels/gestures";
 import { useHostRuntimeClient, useHostRuntimeIsConnected } from "@/runtime/host-runtime";
 import { selectIsCompactFileExplorerOpen, usePanelStore } from "@/stores/panel-store";
@@ -12,6 +15,7 @@ import type { WorkspaceTabTarget } from "@/workspace-tabs/model";
 import { useWorkspaceCheckoutStatus } from "@/screens/workspace/use-workspace-checkout-status";
 import { openWorkspaceFileFromExplorer } from "@/screens/workspace/workspace-file-open-command";
 import { isWeb } from "@/constants/platform";
+import { DiffDocumentWorkspaceCacheProvider } from "@/git/diff-document/workspace-cache";
 import {
   resolveCompactExplorerSidebarHostModel,
   type CompactExplorerSidebarHostModel,
@@ -94,10 +98,16 @@ function useActiveCompactExplorerSidebarModel(
 interface CompactExplorerSidebarHostProps {
   children: ReactNode;
   enabled: boolean;
+  presentation: "overlay" | "dock";
 }
 
-export function CompactExplorerSidebarHost({ children, enabled }: CompactExplorerSidebarHostProps) {
+export function CompactExplorerSidebarHost({
+  children,
+  enabled,
+  presentation,
+}: CompactExplorerSidebarHostProps) {
   const model = useActiveCompactExplorerSidebarModel(enabled);
+  const [containerWidth, setContainerWidth] = useState(0);
   const openCompactFileExplorer = usePanelStore((state) => state.openCompactFileExplorer);
   const showMobileAgent = usePanelStore((state) => state.showMobileAgent);
   const openTab = useWorkspaceLayoutStore((state) => state.openTab);
@@ -127,14 +137,54 @@ export function CompactExplorerSidebarHost({ children, enabled }: CompactExplore
       openWorkspaceFileFromExplorer({
         filePath,
         persistenceKey: model.persistenceKey,
+        closeExplorerAfterOpen: presentation === "overlay",
         showMobileAgent,
         openWorkspaceTabInFocusedPane,
         focusWorkspaceTab,
       });
     },
-    [focusWorkspaceTab, model, openWorkspaceTabInFocusedPane, showMobileAgent],
+    [focusWorkspaceTab, model, openWorkspaceTabInFocusedPane, presentation, showMobileAgent],
   );
 
+  const handleContainerLayout = useCallback((event: LayoutChangeEvent) => {
+    const nextWidth = event.nativeEvent.layout.width;
+    setContainerWidth((current) => (current === nextWidth ? current : nextWidth));
+  }, []);
+
+  const explorer =
+    enabled && model ? (
+      <DiffDocumentWorkspaceCacheProvider key={model.persistenceKey}>
+        {presentation === "dock" ? (
+          <NativeExplorerSidebarDock
+            serverId={model.serverId}
+            workspaceId={model.workspaceId}
+            workspaceRoot={model.workspaceRoot}
+            isGit={model.isGit}
+            persistenceKey={model.persistenceKey}
+            containerWidth={containerWidth}
+            onOpenFile={handleOpenFile}
+          />
+        ) : (
+          <CompactExplorerSidebar
+            serverId={model.serverId}
+            workspaceId={model.workspaceId}
+            workspaceRoot={model.workspaceRoot}
+            isGit={model.isGit}
+            onOpenFile={handleOpenFile}
+          />
+        )}
+      </DiffDocumentWorkspaceCacheProvider>
+    ) : null;
+
+  if (presentation === "dock") {
+    return (
+      <View style={styles.row} onLayout={handleContainerLayout}>
+        <View style={styles.fill}>{children}</View>
+        {explorer}
+      </View>
+    );
+  }
+
   return (
     <>
       <CompactExplorerOpenGestureSurface
@@ -143,15 +193,7 @@ export function CompactExplorerSidebarHost({ children, enabled }: CompactExplore
       >
         {children}
       </CompactExplorerOpenGestureSurface>
-      {enabled && model ? (
+      {explorer}
-        <CompactExplorerSidebar
-          serverId={model.serverId}
-          workspaceId={model.workspaceId}
-          workspaceRoot={model.workspaceRoot}
-          isGit={model.isGit}
-          onOpenFile={handleOpenFile}
-        />
-      ) : null}
     </>
   );
 }
@@ -160,4 +202,8 @@ const styles = {
   fill: {
     flex: 1,
   },
+  row: {
+    flex: 1,
+    flexDirection: "row",
+  },
 } as const;

packages/app/src/components/compact-explorer-sidebar.tsx

@@ -1,5 +1,8 @@
-import { useCallback, useMemo, useState } from "react";
+import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import { View, Text, Pressable } from "react-native";
+import { Gesture } from "react-native-gesture-handler";
+import Animated, { runOnJS, useAnimatedStyle, useSharedValue } from "react-native-reanimated";
+import { scheduleOnRN } from "react-native-worklets";
 import { useSafeAreaInsets } from "react-native-safe-area-context";
 import { StyleSheet, useUnistyles } from "react-native-unistyles";
 import { X } from "lucide-react-native";
@@ -29,6 +32,13 @@ import { useMountedTabSet } from "@/screens/workspace/use-mounted-tab-set";
 import { usePullRequestPanelAvailability } from "@/panels/pull-request-availability";
 import { PullRequestContent } from "@/panels/pull-request";
 import { useAddFileToChat } from "@/panels/use-add-file-to-chat";
+import { SidebarResizeHandle } from "@/components/sidebar-resize-handle";
+import {
+  SIDEBAR_RESIZE_ACTIVATION_OFFSET,
+  SIDEBAR_RESIZE_FAIL_OFFSET,
+} from "@/components/sidebar-resize-handle-layout";
+import { resolveExplorerSidebarWidth } from "@/components/explorer-sidebar-layout";
+import { useWorkspaceLayoutStore } from "@/stores/workspace-layout-store";
 
 function logExplorerSidebar(_event: string, _details: Record<string, unknown>): void {}
 
@@ -139,6 +149,118 @@ export function CompactExplorerSidebar({
   );
 }
 
+interface NativeExplorerSidebarDockProps extends ExplorerSidebarProps {
+  persistenceKey: string;
+  containerWidth: number;
+}
+
+export function NativeExplorerSidebarDock({
+  serverId,
+  workspaceId,
+  workspaceRoot,
+  isGit,
+  onOpenFile,
+  persistenceKey,
+  containerWidth,
+}: NativeExplorerSidebarDockProps) {
+  const { theme } = useUnistyles();
+  const insets = useSafeAreaInsets();
+  const isOpen = usePanelStore(selectIsCompactFileExplorerOpen);
+  const showMobileAgent = usePanelStore((state) => state.showMobileAgent);
+  const storedWidth = useWorkspaceLayoutStore(
+    (state) => state.explorerSidebarWidthByWorkspace[persistenceKey],
+  );
+  const resizeExplorerSidebar = useWorkspaceLayoutStore((state) => state.resizeExplorerSidebar);
+  const visibleWidth = resolveExplorerSidebarWidth({
+    requestedWidth: storedWidth,
+    containerWidth,
+  });
+  const resizeWidth = useSharedValue(visibleWidth);
+  const startWidthRef = useRef(visibleWidth);
+  const [resizePressed, setResizePressed] = useState(false);
+  const { explorerTab, handleTabPress } = useExplorerSidebarSharedState({
+    serverId,
+    workspaceRoot,
+    isGit,
+  });
+
+  useEffect(() => {
+    resizeWidth.value = visibleWidth;
+  }, [resizeWidth, visibleWidth]);
+
+  const showResizeGrip = useCallback(() => setResizePressed(true), []);
+  const hideResizeGrip = useCallback(() => setResizePressed(false), []);
+  const commitWidth = useCallback(
+    (width: number) => resizeExplorerSidebar(persistenceKey, width),
+    [persistenceKey, resizeExplorerSidebar],
+  );
+  const resizeGesture = useMemo(
+    () =>
+      Gesture.Pan()
+        .enabled(true)
+        .hitSlop({ left: 8, right: 8, top: 0, bottom: 0 })
+        .onBegin(() => scheduleOnRN(showResizeGrip))
+        .activeOffsetX([-SIDEBAR_RESIZE_ACTIVATION_OFFSET, SIDEBAR_RESIZE_ACTIVATION_OFFSET])
+        .failOffsetY([-SIDEBAR_RESIZE_FAIL_OFFSET, SIDEBAR_RESIZE_FAIL_OFFSET])
+        .onStart((event) => {
+          startWidthRef.current = visibleWidth + event.translationX;
+          resizeWidth.value = visibleWidth;
+        })
+        .onUpdate((event) => {
+          resizeWidth.value = resolveExplorerSidebarWidth({
+            requestedWidth: startWidthRef.current - event.translationX,
+            containerWidth,
+          });
+        })
+        .onEnd(() => runOnJS(commitWidth)(resizeWidth.value))
+        .onFinalize(() => scheduleOnRN(hideResizeGrip)),
+    [commitWidth, containerWidth, hideResizeGrip, resizeWidth, showResizeGrip, visibleWidth],
+  );
+  const animatedWidthStyle = useAnimatedStyle(() => ({ width: resizeWidth.value }));
+  const dockStyle = useMemo(
+    () => [
+      styles.nativeDock,
+      {
+        display: isOpen ? ("flex" as const) : ("none" as const),
+        paddingTop: insets.top + HEADER_TOP_PADDING_MOBILE,
+        backgroundColor: theme.colors.surfaceSidebar,
+      },
+      animatedWidthStyle,
+    ],
+    [animatedWidthStyle, insets.top, isOpen, theme.colors.surfaceSidebar],
+  );
+  const dockContentStyle = useMemo(
+    () => [styles.nativeDockContent, { borderLeftColor: theme.colors.border }],
+    [theme.colors.border],
+  );
+
+  return (
+    <RetainedPanelActivity active={isOpen}>
+      <Animated.View style={dockStyle} testID="native-explorer-sidebar-dock">
+        <View style={dockContentStyle}>
+          <SidebarResizeHandle
+            edge="left"
+            gesture={resizeGesture}
+            pressed={resizePressed}
+            testID="native-explorer-sidebar-resize-handle"
+          />
+          <ExplorerSidebarContent
+            activeTab={explorerTab}
+            onTabPress={handleTabPress}
+            onClose={showMobileAgent}
+            serverId={serverId}
+            workspaceId={workspaceId}
+            workspaceRoot={workspaceRoot}
+            isGit={isGit}
+            isOpen={isOpen}
+            onOpenFile={onOpenFile}
+          />
+        </View>
+      </Animated.View>
+    </RetainedPanelActivity>
+  );
+}
+
 interface ExplorerTabButtonProps {
   tab: ExplorerTab;
   active: boolean;
@@ -230,7 +352,7 @@ function ExplorerSidebarContent({
             <ExplorerTabButton
               tab="changes"
               active={resolvedTab === "changes"}
-              label={t("workspace.tabs.sidePanel.changes")}
+              label={t("workspace.tabs.explorerSidebar.changes")}
               onTabPress={onTabPress}
               testID="explorer-tab-changes"
             />
@@ -238,7 +360,7 @@ function ExplorerSidebarContent({
           <ExplorerTabButton
             tab="files"
             active={resolvedTab === "files"}
-            label={t("workspace.tabs.sidePanel.files")}
+            label={t("workspace.tabs.explorerSidebar.files")}
             onTabPress={onTabPress}
             testID="explorer-tab-files"
           />
@@ -268,7 +390,7 @@ function ExplorerSidebarContent({
             nativeID="explorer-close"
             accessible
             accessibilityRole="button"
-            accessibilityLabel={t("workspace.tabs.sidePanel.close")}
+            accessibilityLabel={t("workspace.tabs.explorerSidebar.close")}
             hitSlop={8}
           >
             {({ hovered, pressed }) => (
@@ -335,7 +457,6 @@ function ChangedFilesPane({
   );
   return (
     <ChangesSurface
-      host="explorer"
       serverId={serverId}
       workspaceId={workspaceId}
       cwd={workspaceRoot}
@@ -370,6 +491,18 @@ function FilesPane({
 const PrTabContent = PullRequestContent;
 
 const styles = StyleSheet.create((theme) => ({
+  nativeDock: {
+    position: "relative",
+    height: "100%",
+    minHeight: 0,
+    overflow: "hidden",
+  },
+  nativeDockContent: {
+    position: "relative",
+    flex: 1,
+    minHeight: 0,
+    borderLeftWidth: 1,
+  },
   sidebarContent: {
     flex: 1,
     minHeight: 0,

packages/app/src/components/desktop/titlebar-drag-region.tsx

@@ -17,15 +17,20 @@ import { isNative } from "@/constants/platform";
  * On macOS, Electron handles edge resize natively.
  */
 
+export const titlebarDragSurfaceStyle: React.CSSProperties = {
+  cursor: "default",
+  // @ts-expect-error — WebkitAppRegion is not in CSSProperties
+  WebkitAppRegion: "drag",
+};
+
 const DRAG_OVERLAY_STYLE: React.CSSProperties = {
+  ...titlebarDragSurfaceStyle,
   top: 0,
   left: 0,
   display: "block",
   position: "absolute",
   width: "100%",
   height: "100%",
-  // @ts-expect-error — WebkitAppRegion is not in CSSProperties
-  WebkitAppRegion: "drag",
 };
 
 const TOP_RESIZER_STYLE: React.CSSProperties = {

packages/app/src/components/desktop/window-controls.tsx

@@ -0,0 +1,208 @@
+import { useCallback, useMemo } from "react";
+import { Pressable, View } from "react-native";
+import Svg, { Line, Rect } from "react-native-svg";
+import { useTranslation } from "react-i18next";
+import { StyleSheet, withUnistyles } from "react-native-unistyles";
+import {
+  closeDesktopWindow,
+  minimizeDesktopWindow,
+  toggleDesktopMaximize,
+} from "@/desktop/electron/window";
+import {
+  getDesktopWindowControlsPresentation,
+  type DesktopWindowControlsPresentation,
+} from "@/desktop/window-chrome-presentation";
+import { useCustomDesktopWindowControls } from "@/utils/desktop-window";
+import type { Theme } from "@/styles/theme";
+
+type WindowControlKind = "minimize" | "maximize" | "restore" | "close";
+
+function WindowControlGlyph({
+  kind,
+  color,
+  size,
+  strokeWidth,
+}: {
+  kind: WindowControlKind;
+  color: string;
+  size: number;
+  strokeWidth: number;
+}) {
+  if (kind === "minimize") {
+    return (
+      <Svg width={size} height={size} viewBox="0 0 16 16" style={styles.glyph}>
+        <Line x1={3} y1={8} x2={13} y2={8} stroke={color} strokeWidth={strokeWidth} />
+      </Svg>
+    );
+  }
+  if (kind === "restore") {
+    return (
+      <Svg width={size} height={size} viewBox="0 0 16 16" style={styles.glyph}>
+        <Rect
+          x={5.5}
+          y={3.5}
+          width={7}
+          height={7}
+          fill="none"
+          stroke={color}
+          strokeWidth={strokeWidth}
+        />
+        <Line x1={3.5} y1={5.5} x2={3.5} y2={12.5} stroke={color} strokeWidth={strokeWidth} />
+        <Line x1={3} y1={12.5} x2={10.5} y2={12.5} stroke={color} strokeWidth={strokeWidth} />
+      </Svg>
+    );
+  }
+  if (kind === "close") {
+    return (
+      <Svg width={size} height={size} viewBox="0 0 16 16" style={styles.glyph}>
+        <Line x1={4} y1={4} x2={12} y2={12} stroke={color} strokeWidth={strokeWidth} />
+        <Line x1={12} y1={4} x2={4} y2={12} stroke={color} strokeWidth={strokeWidth} />
+      </Svg>
+    );
+  }
+  return (
+    <Svg width={size} height={size} viewBox="0 0 16 16" style={styles.glyph}>
+      <Rect
+        x={3.5}
+        y={3.5}
+        width={9}
+        height={9}
+        fill="none"
+        stroke={color}
+        strokeWidth={strokeWidth}
+      />
+    </Svg>
+  );
+}
+
+const ThemedWindowControlGlyph = withUnistyles(WindowControlGlyph);
+const mutedGlyphMapping = (theme: Theme) => ({ color: theme.colors.foregroundMuted });
+const whiteGlyphMapping = () => ({ color: "#ffffff" });
+
+function WindowControl({
+  kind,
+  label,
+  onPress,
+  presentation,
+}: {
+  kind: WindowControlKind;
+  label: string;
+  onPress: () => void;
+  presentation: DesktopWindowControlsPresentation;
+}) {
+  const glyph = useCallback(
+    ({ hovered, pressed }: { hovered?: boolean; pressed: boolean }) => {
+      const highlighted = hovered || pressed;
+      const closeHighlighted = kind === "close" && highlighted;
+      return (
+        <View
+          style={[
+            styles.controlSurface,
+            presentation.hoverShape === "circle"
+              ? styles.circularControlSurface
+              : styles.fullControlSurface,
+            highlighted ? styles.controlHovered : null,
+            closeHighlighted ? styles.closeHovered : null,
+          ]}
+        >
+          <ThemedWindowControlGlyph
+            kind={kind}
+            size={presentation.glyphSize}
+            strokeWidth={presentation.glyphStrokeWidth}
+            uniProps={closeHighlighted ? whiteGlyphMapping : mutedGlyphMapping}
+          />
+        </View>
+      );
+    },
+    [kind, presentation],
+  );
+  const controlStyle = useMemo(
+    () => [styles.control, { width: presentation.controlWidth }],
+    [presentation.controlWidth],
+  );
+  return (
+    <Pressable
+      accessibilityRole="button"
+      accessibilityLabel={label}
+      onPress={onPress}
+      style={controlStyle}
+    >
+      {glyph}
+    </Pressable>
+  );
+}
+
+export function DesktopWindowControls() {
+  const { t } = useTranslation();
+  const { visible, mode, isMaximized } = useCustomDesktopWindowControls();
+  const minimize = useCallback(() => void minimizeDesktopWindow(), []);
+  const toggleMaximize = useCallback(() => void toggleDesktopMaximize(), []);
+  const close = useCallback(() => void closeDesktopWindow(), []);
+  if (!visible || !mode) return null;
+  const presentation = getDesktopWindowControlsPresentation(mode);
+
+  return (
+    <View
+      style={[styles.controls, { height: presentation.controlHeight }]}
+      testID="desktop-window-controls"
+    >
+      <WindowControl
+        kind="minimize"
+        label={t("desktop.windowControls.minimize")}
+        onPress={minimize}
+        presentation={presentation}
+      />
+      <WindowControl
+        kind={isMaximized ? "restore" : "maximize"}
+        label={t(
+          isMaximized ? "desktop.windowControls.restore" : "desktop.windowControls.maximize",
+        )}
+        onPress={toggleMaximize}
+        presentation={presentation}
+      />
+      <WindowControl
+        kind="close"
+        label={t("desktop.windowControls.close")}
+        onPress={close}
+        presentation={presentation}
+      />
+    </View>
+  );
+}
+
+const styles = StyleSheet.create((theme) => ({
+  controls: {
+    position: "absolute",
+    top: 0,
+    right: 0,
+    zIndex: 3000,
+    flexDirection: "row",
+  },
+  control: {
+    height: "100%",
+    alignItems: "center",
+    justifyContent: "center",
+  },
+  controlSurface: {
+    alignItems: "center",
+    justifyContent: "center",
+  },
+  fullControlSurface: {
+    width: "100%",
+    height: "100%",
+  },
+  circularControlSurface: {
+    width: 24,
+    height: 24,
+    borderRadius: 12,
+  },
+  glyph: {
+    flexShrink: 0,
+  },
+  controlHovered: {
+    backgroundColor: theme.colors.interactionHighlight,
+  },
+  closeHovered: {
+    backgroundColor: "rgba(232, 17, 35, 0.9)",
+  },
+}));

packages/app/src/components/explorer-sidebar-layout.test.ts

@@ -0,0 +1,22 @@
+import { describe, expect, it } from "vitest";
+import {
+  resolveExplorerSidebarDockSizes,
+  resolveExplorerSidebarWidth,
+} from "@/components/explorer-sidebar-layout";
+
+describe("Explorer sidebar layout", () => {
+  it("keeps the sidebar width fixed when the workspace body changes size", () => {
+    const narrow = resolveExplorerSidebarDockSizes({ requestedWidth: 320, containerWidth: 1200 });
+    const wide = resolveExplorerSidebarDockSizes({ requestedWidth: 320, containerWidth: 1520 });
+
+    expect(narrow[1] * 1200).toBeCloseTo(320);
+    expect(wide[1] * 1520).toBeCloseTo(320);
+  });
+
+  it("has no fixed maximum while preserving room for the workspace body", () => {
+    expect(resolveExplorerSidebarWidth({ requestedWidth: 100, containerWidth: 1200 })).toBe(240);
+    expect(resolveExplorerSidebarWidth({ requestedWidth: 900, containerWidth: 1600 })).toBe(900);
+    expect(resolveExplorerSidebarWidth({ requestedWidth: 900, containerWidth: 1200 })).toBe(800);
+    expect(resolveExplorerSidebarWidth({ requestedWidth: 600, containerWidth: 750 })).toBe(350);
+  });
+});

packages/app/src/components/explorer-sidebar-layout.ts

@@ -0,0 +1,27 @@
+const DEFAULT_EXPLORER_SIDEBAR_WIDTH = 320;
+const MIN_EXPLORER_SIDEBAR_WIDTH = 240;
+const MIN_WORKSPACE_BODY_WIDTH = 400;
+
+export function resolveExplorerSidebarWidth(input: {
+  requestedWidth?: number;
+  containerWidth: number;
+}): number {
+  const requestedWidth = input.requestedWidth ?? DEFAULT_EXPLORER_SIDEBAR_WIDTH;
+  const maximumVisibleWidth =
+    input.containerWidth > 0
+      ? Math.max(MIN_EXPLORER_SIDEBAR_WIDTH, input.containerWidth - MIN_WORKSPACE_BODY_WIDTH)
+      : requestedWidth;
+  return Math.max(MIN_EXPLORER_SIDEBAR_WIDTH, Math.min(maximumVisibleWidth, requestedWidth));
+}
+
+export function resolveExplorerSidebarDockSizes(input: {
+  requestedWidth?: number;
+  containerWidth: number;
+}): number[] {
+  if (input.containerWidth <= 0) {
+    return [1, 0];
+  }
+  const width = resolveExplorerSidebarWidth(input);
+  const ratio = width / input.containerWidth;
+  return [1 - ratio, ratio];
+}

packages/app/src/components/file-actions-menu.tsx

@@ -1,6 +1,7 @@
-import { Fragment, useMemo, type ReactElement, type ReactNode } from "react";
+import { Fragment, useMemo, type ReactElement } from "react";
 import { withUnistyles } from "react-native-unistyles";
 import {
+  ArrowRightToLine,
   Copy,
   CopyPlus,
   Download,
@@ -25,8 +26,11 @@ import {
 
 const foregroundMutedColorMapping = (theme: Theme) => ({ color: theme.colors.foregroundMuted });
 const destructiveColorMapping = (theme: Theme) => ({ color: theme.colors.destructive });
+type FileActionGroup = "create" | "open" | "reference" | "manage" | "destructive";
+
 interface FileAction {
   key: string;
+  group: FileActionGroup;
   label: string;
   icon: LucideIcon;
   onSelect: () => void;
@@ -35,10 +39,19 @@ interface FileAction {
   testID?: string;
 }
 
+function optionalFileAction(
+  available: boolean,
+  onSelect: (() => void) | undefined,
+  action: Omit<FileAction, "onSelect">,
+): FileAction | null {
+  return available && onSelect ? { ...action, onSelect } : null;
+}
+
 interface FileActionsContextMenuContentProps {
   fileKind: "file" | "directory";
   fileExists?: boolean;
   onOpenFile?: () => void;
+  onOpenToSide?: () => void;
   onCopyPath?: () => void;
   onCopyRelativePath?: () => void;
   onReveal?: () => void;
@@ -52,8 +65,6 @@ interface FileActionsContextMenuContentProps {
   onDuplicate?: () => void;
   onRevert?: () => void;
   onDelete?: () => void;
-  /** Optional metadata block rendered above the actions (e.g. size/modified). */
-  header?: ReactNode;
   testIDPrefix?: string;
 }
 
@@ -65,6 +76,7 @@ export function FileActionsContextMenuContent({
   fileKind,
   fileExists = true,
   onOpenFile,
+  onOpenToSide,
   onCopyPath,
   onCopyRelativePath,
   onReveal,
@@ -78,7 +90,6 @@ export function FileActionsContextMenuContent({
   onDuplicate,
   onRevert,
   onDelete,
-  header,
   testIDPrefix,
 }: FileActionsContextMenuContentProps): ReactElement | null {
   const { t } = useTranslation();
@@ -88,6 +99,7 @@ export function FileActionsContextMenuContent({
       onNewFile
         ? {
             key: "new-file",
+            group: "create",
             label: t("workspace.fileActions.newFile"),
             icon: FilePlus,
             onSelect: onNewFile,
@@ -96,6 +108,7 @@ export function FileActionsContextMenuContent({
       onNewFolder
         ? {
             key: "new-folder",
+            group: "create",
             label: t("workspace.fileActions.newFolder"),
             icon: FolderPlus,
             onSelect: onNewFolder,
@@ -104,6 +117,7 @@ export function FileActionsContextMenuContent({
       onCollapseFolder
         ? {
             key: "collapse-folder",
+            group: "open",
             label: t("workspace.fileActions.collapseFolder"),
             icon: FolderMinus,
             onSelect: onCollapseFolder,
@@ -112,30 +126,22 @@ export function FileActionsContextMenuContent({
       availableFile && onOpenFile
         ? {
             key: "open-file",
+            group: "open",
             label: t("workspace.fileActions.openFile"),
             icon: FileText,
             onSelect: onOpenFile,
           }
         : null,
-      onRename
+      optionalFileAction(availableFile, onOpenToSide, {
-        ? {
+        key: "open-to-side",
-            key: "rename",
+        group: "open",
-            label: t("workspace.fileActions.rename"),
+        label: t("workspace.fileActions.openToSide"),
-            icon: Pencil,
+        icon: ArrowRightToLine,
-            onSelect: onRename,
+      }),
-          }
-        : null,
-      onDuplicate
-        ? {
-            key: "duplicate",
-            label: t("workspace.fileActions.duplicate"),
-            icon: CopyPlus,
-            onSelect: onDuplicate,
-          }
-        : null,
       onCopyPath
         ? {
             key: "copy-path",
+            group: "reference",
             label: t("workspace.fileActions.copyPath"),
             icon: Copy,
             onSelect: onCopyPath,
@@ -144,6 +150,7 @@ export function FileActionsContextMenuContent({
       onCopyRelativePath
         ? {
             key: "copy-relative-path",
+            group: "reference",
             label: t("workspace.fileActions.copyRelativePath"),
             icon: Copy,
             onSelect: onCopyRelativePath,
@@ -152,6 +159,7 @@ export function FileActionsContextMenuContent({
       onReveal && revealTargetName
         ? {
             key: "reveal",
+            group: "reference",
             label: t("workspace.fileActions.revealIn", { target: revealTargetName }),
             icon: FolderOpen,
             onSelect: onReveal,
@@ -160,6 +168,7 @@ export function FileActionsContextMenuContent({
       availableFile && onDownload
         ? {
             key: "download",
+            group: "reference",
             label: t("workspace.fileActions.download"),
             icon: Download,
             onSelect: onDownload,
@@ -168,14 +177,34 @@ export function FileActionsContextMenuContent({
       availableFile && onAddToChat
         ? {
             key: "add-to-chat",
+            group: "reference",
             label: t("workspace.fileActions.addToChat"),
             icon: MessageSquarePlus,
             onSelect: onAddToChat,
           }
         : null,
+      onRename
+        ? {
+            key: "rename",
+            group: "manage",
+            label: t("workspace.fileActions.rename"),
+            icon: Pencil,
+            onSelect: onRename,
+          }
+        : null,
+      onDuplicate
+        ? {
+            key: "duplicate",
+            group: "manage",
+            label: t("workspace.fileActions.duplicate"),
+            icon: CopyPlus,
+            onSelect: onDuplicate,
+          }
+        : null,
       onRevert
         ? {
             key: "revert",
+            group: "destructive",
             label: t("workspace.fileActions.revert"),
             icon: Undo2,
             onSelect: onRevert,
@@ -185,6 +214,7 @@ export function FileActionsContextMenuContent({
       onDelete
         ? {
             key: "delete",
+            group: "destructive",
             label: t("workspace.fileActions.delete"),
             icon: Trash2,
             onSelect: onDelete,
@@ -195,9 +225,7 @@ export function FileActionsContextMenuContent({
     const availableActions = specs.filter((action): action is FileAction => action !== null);
     return availableActions.map((action, index) =>
       Object.assign(action, {
-        separatorBefore: Boolean(
+        separatorBefore: index > 0 && action.group !== availableActions[index - 1]?.group,
-          action.destructive && index > 0 && !availableActions[index - 1].destructive,
-        ),
         testID: testIDPrefix ? `${testIDPrefix}-${action.key}` : undefined,
       }),
     );
@@ -214,6 +242,7 @@ export function FileActionsContextMenuContent({
     onNewFile,
     onNewFolder,
     onOpenFile,
+    onOpenToSide,
     onRename,
     onReveal,
     onRevert,
@@ -231,12 +260,6 @@ export function FileActionsContextMenuContent({
       width={220}
       testID={testIDPrefix ? `${testIDPrefix}-context-menu` : undefined}
     >
-      {header ? (
-        <>
-          {header}
-          <ContextMenuSeparator />
-        </>
-      ) : null}
       {actions.map((action) => (
         <Fragment key={action.key}>
           {action.separatorBefore ? <ContextMenuSeparator /> : null}

packages/app/src/components/file-explorer-pane.tsx

@@ -41,7 +41,9 @@ import { LoadingSpinner } from "@/components/ui/loading-spinner";
 import {
   PaneContentToolbar,
   paneContentToolbarIconSize,
-  paneContentToolbarIconButtonStyle,
+  paneContentToolbarTrailingPadding,
+  ToolbarButton,
+  ToolbarControls,
 } from "@/components/ui/pane-content-toolbar";
 import {
   useOverlayFlatListScrollbar,
@@ -61,7 +63,6 @@ import { useIsLocalDaemon } from "@/hooks/use-is-local-daemon";
 import { useFileExplorerActions } from "@/hooks/use-file-explorer-actions";
 import { buildWorkspaceExplorerStateKey } from "@/hooks/use-file-explorer-actions";
 import { usePanelStore, type ExpandedPathsUpdate, type SortOption } from "@/stores/panel-store";
-import { formatTimeAgo } from "@/utils/time";
 import { buildAbsoluteExplorerPath } from "@/utils/explorer-paths";
 import { isHiddenExplorerPath } from "@/file-explorer/visibility";
 import {
@@ -100,16 +101,6 @@ function DirectoryChevronIcon({ loading, expanded }: { loading: boolean; expande
   return <TreeChevron expanded={expanded} />;
 }
 
-function formatFileSize({ size }: { size: number }): string {
-  if (size < 1024) {
-    return `${size} B`;
-  }
-  if (size < 1024 * 1024) {
-    return `${(size / 1024).toFixed(1)} KB`;
-  }
-  return `${(size / (1024 * 1024)).toFixed(1)} MB`;
-}
-
 interface TreeRowItemProps {
   serverId: string;
   workspaceId?: string | null;
@@ -126,6 +117,7 @@ interface TreeRowItemProps {
   revealTargetName?: string;
   onDownloadEntry: (entry: ExplorerEntry) => void;
   onAddToChat?: (path: string) => void;
+  onOpenFileToSide?: (path: string) => void;
   onNewEntry?: (parentPath: string, kind: "file" | "directory") => void;
   onCollapseDirectory?: (path: string) => void;
   onRenameEntry?: (entry: ExplorerEntry) => void;
@@ -141,13 +133,6 @@ function sortTriggerStyle({
   return [styles.sortTrigger, (Boolean(hovered) || pressed) && styles.sortTriggerHovered];
 }
 
-function iconButtonStyle(
-  isCompact: boolean,
-  { hovered, pressed }: PressableStateCallbackType & { hovered?: boolean },
-) {
-  return paneContentToolbarIconButtonStyle({ hovered, pressed }, false, isCompact);
-}
-
 type ExplorerListRow =
   | { type: "entry"; row: ExplorerTreeRow }
   | { type: "draft"; parentPath: string; kind: "file" | "directory"; depth: number }
@@ -256,6 +241,7 @@ function TreeRowItem({
   revealTargetName,
   onDownloadEntry,
   onAddToChat,
+  onOpenFileToSide,
   onNewEntry,
   onCollapseDirectory,
   onRenameEntry,
@@ -263,7 +249,6 @@ function TreeRowItem({
   onDeleteEntry,
   testID,
 }: TreeRowItemProps) {
-  const { t } = useTranslation();
   const [isHovered, setIsHovered] = useState(false);
   const showNameHover = useCallback(() => setIsHovered(true), []);
   const hideNameHover = useCallback(() => setIsHovered(false), []);
@@ -317,6 +302,10 @@ function TreeRowItem({
     onAddToChat?.(entry.path);
   }, [onAddToChat, entry.path]);
 
+  const handleOpenToSide = useCallback(() => {
+    onOpenFileToSide?.(entry.path);
+  }, [entry.path, onOpenFileToSide]);
+
   const handleNewFile = useCallback(() => {
     onNewEntry?.(entry.path, "file");
   }, [onNewEntry, entry.path]);
@@ -341,30 +330,6 @@ function TreeRowItem({
     onDeleteEntry?.(entry);
   }, [onDeleteEntry, entry]);
 
-  const metaHeader = useMemo(
-    () => (
-      <View style={styles.contextMetaBlock}>
-        <View style={styles.contextMetaRow}>
-          <Text style={styles.contextMetaLabel} numberOfLines={1}>
-            {t("workspace.fileExplorer.context.size")}
-          </Text>
-          <Text style={styles.contextMetaValue} numberOfLines={1} ellipsizeMode="tail">
-            {formatFileSize({ size: entry.size })}
-          </Text>
-        </View>
-        <View style={styles.contextMetaRow}>
-          <Text style={styles.contextMetaLabel} numberOfLines={1}>
-            {t("workspace.fileExplorer.context.modified")}
-          </Text>
-          <Text style={styles.contextMetaValue} numberOfLines={1} ellipsizeMode="tail">
-            {formatTimeAgo(new Date(entry.modifiedAt))}
-          </Text>
-        </View>
-      </View>
-    ),
-    [entry.modifiedAt, entry.size, t],
-  );
-
   return (
     <ContextMenu>
       <ContextMenuTrigger
@@ -407,13 +372,13 @@ function TreeRowItem({
         revealTargetName={revealTargetName}
         onDownload={handleDownload}
         onAddToChat={onAddToChat ? handleAddToChat : undefined}
+        onOpenToSide={!isDirectory && onOpenFileToSide ? handleOpenToSide : undefined}
         onNewFile={onNewEntry ? handleNewFile : undefined}
         onNewFolder={onNewEntry ? handleNewFolder : undefined}
         onCollapseFolder={isDirectory && isExpanded ? handleCollapseDirectory : undefined}
         onRename={onRenameEntry ? handleRename : undefined}
         onDuplicate={onDuplicateEntry ? handleDuplicate : undefined}
         onDelete={onDeleteEntry ? handleDelete : undefined}
-        header={metaHeader}
         testIDPrefix={testID}
       />
     </ContextMenu>
@@ -425,6 +390,7 @@ interface FileExplorerPaneProps {
   workspaceId?: string | null;
   workspaceRoot: string;
   onOpenFile?: (filePath: string) => void;
+  onOpenFileToSide?: (filePath: string) => void;
   onAddToChat?: (path: string) => void;
 }
 
@@ -433,6 +399,7 @@ export function FileExplorerPane({
   workspaceId,
   workspaceRoot,
   onOpenFile,
+  onOpenFileToSide,
   onAddToChat,
 }: FileExplorerPaneProps) {
   const { t } = useTranslation();
@@ -996,6 +963,7 @@ export function FileExplorerPane({
           revealTargetName={fileManagerTarget?.label}
           onDownloadEntry={handleDownloadEntry}
           onAddToChat={onAddToChat}
+          onOpenFileToSide={onOpenFileToSide}
           onNewEntry={fsEntryOpsEnabled ? handleNewEntry : undefined}
           onCollapseDirectory={handleCollapseDirectory}
           onRenameEntry={fsEntryOpsEnabled ? handleRenameEntry : undefined}
@@ -1026,6 +994,7 @@ export function FileExplorerPane({
       fileManagerTarget,
       selectedEntryPath,
       onAddToChat,
+      onOpenFileToSide,
       serverId,
       workspaceId,
     ],
@@ -1049,11 +1018,6 @@ export function FileExplorerPane({
     });
   }, [requestDirectoryListing]);
 
-  const toolbarIconButtonStyle = useCallback(
-    (state: PressableStateCallbackType) => iconButtonStyle(isCompact, state),
-    [isCompact],
-  );
-
   if (!hasWorkspaceScope) {
     return (
       <View style={styles.centerState}>
@@ -1087,7 +1051,6 @@ export function FileExplorerPane({
         handleBackFromError={handleBackFromError}
         handleRetry={handleRetry}
         sortTriggerStyle={sortTriggerStyle}
-        iconButtonStyle={toolbarIconButtonStyle}
       />
     </View>
   );
@@ -1162,7 +1125,6 @@ interface FileExplorerPaneContentProps {
   handleBackFromError: () => void;
   handleRetry: () => void;
   sortTriggerStyle: (state: PressableStateCallbackType) => StyleProp<ViewStyle>;
-  iconButtonStyle: (state: PressableStateCallbackType) => StyleProp<ViewStyle>;
 }
 
 function FileExplorerPaneContent(props: FileExplorerPaneContentProps) {
@@ -1186,7 +1148,6 @@ function FileExplorerPaneContent(props: FileExplorerPaneContentProps) {
     handleBackFromError,
     handleRetry,
     sortTriggerStyle: sortTriggerStyleProp,
-    iconButtonStyle: iconButtonStyleProp,
   } = props;
 
   const showHiddenFiles = usePanelStore((state) => state.explorerShowHiddenFiles);
@@ -1204,17 +1165,6 @@ function FileExplorerPaneContent(props: FileExplorerPaneContentProps) {
   const emptyLabel = showHiddenFiles
     ? t("workspace.fileExplorer.empty.noFiles")
     : t("workspace.fileExplorer.empty.noVisibleFiles");
-  const hiddenFilesToggleStyle = useCallback(
-    (state: PressableStateCallbackType) => [
-      iconButtonStyleProp(state),
-      !showHiddenFiles && styles.iconButtonActive,
-    ],
-    [showHiddenFiles, iconButtonStyleProp],
-  );
-  const hiddenFilesToggleAccessibilityState = useMemo(
-    () => ({ selected: !showHiddenFiles }),
-    [showHiddenFiles],
-  );
 
   if (error) {
     return (
@@ -1245,7 +1195,10 @@ function FileExplorerPaneContent(props: FileExplorerPaneContentProps) {
 
   return (
     <View style={[styles.treePane, styles.treePaneFill]}>
-      <PaneContentToolbar style={styles.paneHeader} testID="files-pane-header">
+      <PaneContentToolbar
+        style={[styles.paneHeader, { paddingRight: paneContentToolbarTrailingPadding(isCompact) }]}
+        testID="files-pane-header"
+      >
         <Pressable
           onPress={handleSortCycle}
           style={sortTriggerStyleProp}
@@ -1256,86 +1209,82 @@ function FileExplorerPaneContent(props: FileExplorerPaneContentProps) {
           </Text>
           <ChevronDown size={12} color={theme.colors.foregroundMuted} />
         </Pressable>
-        <View style={styles.headerActions}>
+        <ToolbarControls style={styles.headerActions}>
           {onNewEntryAtRoot ? (
             <>
-              <Pressable
+              <ToolbarButton
-                onPress={handleNewFileAtRoot}
+                label={t("workspace.fileActions.newFile")}
+                compact={isCompact}
                 hitSlop={8}
-                style={iconButtonStyleProp}
-                accessibilityRole="button"
-                accessibilityLabel={t("workspace.fileActions.newFile")}
                 testID="files-new-file"
+                onPress={handleNewFileAtRoot}
               >
                 <FilePlus
                   size={paneContentToolbarIconSize(isCompact)}
-                  color={theme.colors.foregroundMuted}
+                  color={theme.colors.foregroundExtraMuted}
                 />
-              </Pressable>
+              </ToolbarButton>
-              <Pressable
+              <ToolbarButton
-                onPress={handleNewFolderAtRoot}
+                label={t("workspace.fileActions.newFolder")}
+                compact={isCompact}
                 hitSlop={8}
-                style={iconButtonStyleProp}
-                accessibilityRole="button"
-                accessibilityLabel={t("workspace.fileActions.newFolder")}
                 testID="files-new-folder"
+                onPress={handleNewFolderAtRoot}
               >
                 <FolderPlus
                   size={paneContentToolbarIconSize(isCompact)}
-                  color={theme.colors.foregroundMuted}
+                  color={theme.colors.foregroundExtraMuted}
                 />
-              </Pressable>
+              </ToolbarButton>
             </>
           ) : null}
-          <Pressable
+          <ToolbarButton
-            onPress={handleToggleHiddenFiles}
+            label={hiddenFilesToggleAccessibilityLabel}
+            selected={!showHiddenFiles}
+            compact={isCompact}
             hitSlop={8}
-            style={hiddenFilesToggleStyle}
-            accessibilityRole="button"
-            accessibilityLabel={hiddenFilesToggleAccessibilityLabel}
-            accessibilityState={hiddenFilesToggleAccessibilityState}
             testID="files-hidden-toggle"
+            onPress={handleToggleHiddenFiles}
           >
             {showHiddenFiles ? (
               <Eye
                 size={paneContentToolbarIconSize(isCompact)}
-                color={theme.colors.foregroundMuted}
+                color={theme.colors.foregroundExtraMuted}
               />
             ) : (
               <EyeOff
                 size={paneContentToolbarIconSize(isCompact)}
-                color={theme.colors.foregroundMuted}
+                color={theme.colors.foregroundExtraMuted}
               />
             )}
-          </Pressable>
+          </ToolbarButton>
-          <Pressable
+          <ToolbarButton
-            onPress={handleRefresh}
+            label={
-            disabled={isRefreshFetching}
-            hitSlop={8}
-            style={iconButtonStyleProp}
-            accessibilityRole="button"
-            accessibilityLabel={
               isRefreshFetching
                 ? t("workspace.fileExplorer.actions.refreshing")
                 : t("workspace.fileExplorer.actions.refresh")
             }
+            compact={isCompact}
+            disabled={isRefreshFetching}
+            hitSlop={8}
             testID="files-refresh"
+            onPress={handleRefresh}
           >
             <View style={styles.refreshIcon}>
               {isRefreshFetching ? (
                 <LoadingSpinner
                   size={paneContentToolbarIconSize(isCompact)}
-                  color={theme.colors.foregroundMuted}
+                  color={theme.colors.foregroundExtraMuted}
                 />
               ) : (
                 <RotateCw
                   size={paneContentToolbarIconSize(isCompact)}
-                  color={theme.colors.foregroundMuted}
+                  color={theme.colors.foregroundExtraMuted}
                 />
               )}
             </View>
-          </Pressable>
+          </ToolbarButton>
-        </View>
+        </ToolbarControls>
       </PaneContentToolbar>
       <ContextMenu>
         <RootCreationContextTarget enabled={Boolean(onNewEntryAtRoot)}>
@@ -1479,6 +1428,7 @@ function TreeRowDispatcher({
   revealTargetName,
   onDownloadEntry,
   onAddToChat,
+  onOpenFileToSide,
   onNewEntry,
   onCollapseDirectory,
   onRenameEntry,
@@ -1500,6 +1450,7 @@ function TreeRowDispatcher({
   revealTargetName?: string;
   onDownloadEntry: (entry: ExplorerEntry) => void;
   onAddToChat?: (path: string) => void;
+  onOpenFileToSide?: (path: string) => void;
   onNewEntry?: (parentPath: string, kind: "file" | "directory") => void;
   onCollapseDirectory?: (path: string) => void;
   onRenameEntry?: (entry: ExplorerEntry) => void;
@@ -1530,6 +1481,7 @@ function TreeRowDispatcher({
       revealTargetName={revealTargetName}
       onDownloadEntry={onDownloadEntry}
       onAddToChat={onAddToChat}
+      onOpenFileToSide={onOpenFileToSide}
       onNewEntry={onNewEntry}
       onCollapseDirectory={onCollapseDirectory}
       onRenameEntry={onRenameEntry}
@@ -1698,7 +1650,7 @@ const styles = StyleSheet.create((theme) => ({
     flexDirection: "row",
     alignItems: "center",
     justifyContent: "space-between",
-    paddingRight: theme.spacing[3],
+    backgroundColor: theme.colors.surfaceSidebar,
   },
   sortTrigger: {
     flexDirection: "row",
@@ -1711,7 +1663,7 @@ const styles = StyleSheet.create((theme) => ({
     borderRadius: theme.borderRadius.base,
   },
   sortTriggerHovered: {
-    backgroundColor: theme.colors.surface2,
+    backgroundColor: theme.colors.surfaceSidebarHover,
   },
   sortTriggerText: {
     fontSize: theme.fontSize.sm,
@@ -1720,7 +1672,6 @@ const styles = StyleSheet.create((theme) => ({
   headerActions: {
     flexDirection: "row",
     alignItems: "center",
-    gap: theme.spacing[1],
   },
   treeList: {
     flex: 1,
@@ -1807,38 +1758,12 @@ const styles = StyleSheet.create((theme) => ({
   draftPlaceholder: {
     color: theme.colors.foregroundExtraMuted,
   },
-  contextMetaBlock: {
-    paddingVertical: theme.spacing[1],
-  },
-  contextMetaRow: {
-    flexDirection: "row",
-    alignItems: "center",
-    justifyContent: "space-between",
-    minHeight: 32,
-    paddingHorizontal: theme.spacing[3],
-  },
-  contextMetaLabel: {
-    fontSize: theme.fontSize.base,
-    color: theme.colors.foregroundMuted,
-    flexShrink: 0,
-  },
-  contextMetaValue: {
-    fontSize: theme.fontSize.base,
-    color: theme.colors.foreground,
-    fontWeight: theme.fontWeight.medium,
-    flex: 1,
-    minWidth: 0,
-    textAlign: "right",
-  },
   previewHeaderText: {
     flex: 1,
     color: theme.colors.foreground,
     fontSize: theme.fontSize.base,
     fontWeight: theme.fontWeight.normal,
   },
-  iconButtonActive: {
-    backgroundColor: theme.colors.surface2,
-  },
   refreshIcon: {
     width: 16,
     height: 16,

packages/app/src/components/headers/header-toggle-button.tsx

@@ -5,6 +5,10 @@ import { Tooltip, TooltipContent, TooltipTrigger } from "@/components/ui/tooltip
 import { Shortcut } from "@/components/ui/shortcut";
 import type { ShortcutKey } from "@/utils/format-shortcut";
 import { isWeb } from "@/constants/platform";
+import {
+  iconButtonChromeFrameStyle,
+  iconButtonChromeStyle,
+} from "@/components/ui/icon-button-chrome";
 
 interface HeaderToggleButtonState {
   hovered: boolean;
@@ -42,7 +46,17 @@ export function HeaderToggleButton({
       ? ({ "aria-expanded": expandedState } as Record<string, boolean>)
       : null;
 
-  const combinedStyle = useMemo(() => [headerIconSlotStyle.slot, style], [style]);
+  const combinedStyle = useMemo(
+    () =>
+      ({ hovered, pressed }: { hovered?: boolean; pressed: boolean }) =>
+        iconButtonChromeStyle({
+          size: "large",
+          state: { hovered: Boolean(hovered), pressed },
+          disabled: Boolean(disabled),
+          style,
+        }),
+    [disabled, style],
+  );
 
   return (
     <Tooltip delayDuration={tooltipDelayDuration} enabledOnDesktop enabledOnMobile={false}>
@@ -68,16 +82,6 @@ export function HeaderToggleButton({
   );
 }
 
-export const headerIconSlotStyle = StyleSheet.create((theme) => ({
-  slot: {
-    padding: {
-      xs: theme.spacing[3],
-      md: theme.spacing[2],
-    },
-    borderRadius: theme.borderRadius.lg,
-  },
-}));
-
 const styles = StyleSheet.create((theme) => ({
   tooltipRow: {
     flexDirection: "row",
@@ -90,3 +94,7 @@ const styles = StyleSheet.create((theme) => ({
   },
   shortcut: {},
 }));
+
+export const headerIconSlotStyle = {
+  slot: iconButtonChromeFrameStyle("large"),
+};

packages/app/src/components/headers/menu-header.tsx

@@ -10,6 +10,7 @@ import { selectIsAgentListOpen, usePanelStore } from "@/stores/panel-store";
 import { useIsCompactFormFactor } from "@/constants/layout";
 import { getShortcutOs } from "@/utils/shortcut-platform";
 import { useHasWindowChromeObstruction, useOwnsWindowChromeCorner } from "@/utils/desktop-window";
+import { iconButtonChromeGlyphSize } from "@/components/ui/icon-button-chrome";
 
 interface MenuHeaderProps {
   title?: string;
@@ -26,7 +27,7 @@ interface SidebarMenuToggleProps {
 
 const MOBILE_MENU_LINE_WIDTH = 16;
 const MOBILE_MENU_LINE_SHORT_WIDTH = 8;
-const MOBILE_MENU_LINE_HEIGHT = 2;
+const MOBILE_MENU_LINE_HEIGHT = 1.5;
 
 function MobileMenuIcon({ color }: { color: string }) {
   const lineStyle = useMemo(() => [styles.mobileMenuLine, { backgroundColor: color }], [color]);
@@ -84,19 +85,21 @@ function SidebarMenuToggleButton({
       accessibilityLabel={isOpen ? t("shell.menu.close") : t("shell.menu.open")}
       accessibilityState={accessibilityState}
     >
-      {({ hovered, pressed }) => {
+      {isMobile ? (
-        let color = extraMutedIdleIcon
+        <MobileMenuIcon
-          ? theme.colors.foregroundExtraMuted
+          color={
-          : theme.colors.foregroundMuted;
+            extraMutedIdleIcon ? theme.colors.foregroundExtraMuted : theme.colors.foregroundMuted
-        if (hovered || pressed) {
+          }
-          color = theme.colors.foreground;
+        />
-        }
+      ) : (
-        return isMobile ? (
+        <PanelLeft
-          <MobileMenuIcon color={color} />
+          size={iconButtonChromeGlyphSize("large")}
-        ) : (
+          strokeWidth={1.5}
-          <PanelLeft size={theme.iconSize.md} color={color} />
+          color={
-        );
+            extraMutedIdleIcon ? theme.colors.foregroundExtraMuted : theme.colors.foregroundMuted
-      }}
+          }
+        />
+      )}
     </HeaderToggleButton>
   );
 }

packages/app/src/components/message.tsx

@@ -1462,7 +1462,7 @@ export const AssistantMessage = memo(function AssistantMessage({
 
   const fileLinkActions = useAssistantFileLinkActions();
   const handleMarkdownLinkPress = useStableEvent((url: string) => {
-    fileLinkActions.open({ href: url }, "side");
+    fileLinkActions.open({ href: url }, "preferred");
     // react-native-markdown-display opens the link itself when this returns true.
     // We already handled it above, so return false to avoid duplicate opens.
     return false;

packages/app/src/components/resize-handle.tsx

@@ -1,14 +1,22 @@
 import { useCallback, useMemo, useRef, useState } from "react";
 import { View, type PointerEvent as RNPointerEvent } from "react-native";
+import { Gesture, GestureDetector } from "react-native-gesture-handler";
 import { StyleSheet, useUnistyles } from "react-native-unistyles";
 import { startResizeHandleDrag, type ResizeHandleDrag } from "@/components/resize-handle-drag";
+import { useHasFinePointer } from "@/hooks/use-fine-pointer";
+import {
+  SIDEBAR_RESIZE_ACTIVATION_OFFSET,
+  SIDEBAR_RESIZE_FAIL_OFFSET,
+} from "@/components/sidebar-resize-handle-layout";
 
 export interface ResizeHandleProps {
   testID?: string;
   direction: "horizontal" | "vertical";
+  hitAreaAlignment?: "center" | "end";
   groupId: string;
   index: number;
   sizes: number[];
+  containerSize: number;
   onPreviewResizeSplit: (groupId: string, sizes: number[]) => void;
   onResizeSplit: (groupId: string, sizes: number[]) => void;
 }
@@ -30,14 +38,18 @@ function resetWindowHorizontalScroll() {
 export function ResizeHandle({
   testID,
   direction,
+  hitAreaAlignment = "center",
   groupId,
   index,
   sizes,
+  containerSize,
   onPreviewResizeSplit,
   onResizeSplit,
 }: ResizeHandleProps) {
   const { theme } = useUnistyles();
+  const finePointer = useHasFinePointer();
   const pointerStatesRef = useRef(new Map<number, PointerState>());
+  const touchDragRef = useRef<ResizeHandleDrag | null>(null);
   const cursorBeforeDragRef = useRef<string | null>(null);
   const hoverTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
   const [active, setActive] = useState(false);
@@ -51,13 +63,6 @@ export function ResizeHandle({
         return;
       }
 
-      const containerElement = hitAreaElement.parentElement?.parentElement ?? null;
-      if (!containerElement) {
-        return;
-      }
-
-      const rect = containerElement.getBoundingClientRect();
-      const containerSize = direction === "horizontal" ? rect.width : rect.height;
       if (containerSize <= 0) {
         return;
       }
@@ -140,9 +145,41 @@ export function ResizeHandle({
       window.addEventListener("pointerup", handlePointerUp);
       window.addEventListener("pointercancel", handlePointerUp);
     },
-    [direction, groupId, index, onPreviewResizeSplit, onResizeSplit, sizes],
+    [containerSize, direction, groupId, index, onPreviewResizeSplit, onResizeSplit, sizes],
   );
 
+  const touchGesture = useMemo(() => {
+    const gesture = Gesture.Pan()
+      .runOnJS(true)
+      .onBegin(() => setDragging(true))
+      .onStart(() => {
+        touchDragRef.current = startResizeHandleDrag({
+          sizes,
+          index,
+          preview: (nextSizes) => onPreviewResizeSplit(groupId, nextSizes),
+          commit: (nextSizes) => onResizeSplit(groupId, nextSizes),
+        });
+      })
+      .onUpdate((event) => {
+        if (containerSize <= 0) return;
+        const translation = direction === "horizontal" ? event.translationX : event.translationY;
+        touchDragRef.current?.move(translation / containerSize);
+      })
+      .onEnd(() => touchDragRef.current?.finish())
+      .onFinalize(() => {
+        touchDragRef.current = null;
+        setDragging(false);
+      });
+
+    return direction === "horizontal"
+      ? gesture
+          .activeOffsetX([-SIDEBAR_RESIZE_ACTIVATION_OFFSET, SIDEBAR_RESIZE_ACTIVATION_OFFSET])
+          .failOffsetY([-SIDEBAR_RESIZE_FAIL_OFFSET, SIDEBAR_RESIZE_FAIL_OFFSET])
+      : gesture
+          .activeOffsetY([-SIDEBAR_RESIZE_ACTIVATION_OFFSET, SIDEBAR_RESIZE_ACTIVATION_OFFSET])
+          .failOffsetX([-SIDEBAR_RESIZE_FAIL_OFFSET, SIDEBAR_RESIZE_FAIL_OFFSET]);
+  }, [containerSize, direction, groupId, index, onPreviewResizeSplit, onResizeSplit, sizes]);
+
   const handlePointerEnter = useCallback(() => {
     hoverTimerRef.current = setTimeout(() => {
       setActive(true);
@@ -178,11 +215,36 @@ export function ResizeHandle({
       styles.hitArea,
       direction === "horizontal" ? styles.hitAreaHorizontal : styles.hitAreaVertical,
       {
+        ...(direction === "horizontal"
+          ? { left: hitAreaAlignment === "end" ? 0 : -5 }
+          : { top: hitAreaAlignment === "end" ? 0 : -5 }),
         cursor: direction === "horizontal" ? "col-resize" : "row-resize",
         touchAction: "none",
       } as object,
     ],
-    [direction],
+    [direction, hitAreaAlignment],
+  );
+  const touchHitAreaStyle = useMemo(
+    () => [
+      styles.touchHitArea,
+      direction === "horizontal" ? styles.touchHitAreaHorizontal : styles.touchHitAreaVertical,
+      {
+        ...(direction === "horizontal"
+          ? { left: hitAreaAlignment === "end" ? 0 : -12 }
+          : { top: hitAreaAlignment === "end" ? 0 : -12 }),
+        touchAction: "none",
+      } as object,
+    ],
+    [direction, hitAreaAlignment],
+  );
+  const touchGripStyle = useMemo(
+    () => [
+      styles.touchGrip,
+      direction === "horizontal" ? styles.touchGripHorizontal : styles.touchGripVertical,
+      highlighted ? styles.touchGripVisible : styles.touchGripHidden,
+      { backgroundColor: theme.colors.foreground },
+    ],
+    [direction, highlighted, theme.colors.foreground],
   );
 
   return (
@@ -194,14 +256,27 @@ export function ResizeHandle({
           testID={testID ? `${testID}-highlight` : undefined}
         />
       )}
-      <View
+      {finePointer ? (
-        role="separator"
+        <View
-        aria-orientation={direction === "horizontal" ? "vertical" : "horizontal"}
+          role="separator"
-        style={hitAreaStyle}
+          aria-orientation={direction === "horizontal" ? "vertical" : "horizontal"}
-        onPointerDown={handlePointerDown}
+          style={hitAreaStyle}
-        onPointerEnter={handlePointerEnter}
+          onPointerDown={handlePointerDown}
-        onPointerLeave={handlePointerLeave}
+          onPointerEnter={handlePointerEnter}
-      />
+          onPointerLeave={handlePointerLeave}
+        />
+      ) : (
+        <GestureDetector gesture={touchGesture}>
+          <View
+            role="separator"
+            aria-orientation={direction === "horizontal" ? "vertical" : "horizontal"}
+            collapsable={false}
+            style={touchHitAreaStyle}
+          >
+            <View pointerEvents="none" style={touchGripStyle} />
+          </View>
+        </GestureDetector>
+      )}
     </View>
   );
 }
@@ -210,6 +285,7 @@ const styles = StyleSheet.create((_theme) => ({
   handle: {
     position: "relative",
     flexShrink: 0,
+    zIndex: 10,
   },
   handleHorizontal: {
     width: 1,
@@ -240,15 +316,48 @@ const styles = StyleSheet.create((_theme) => ({
     zIndex: 10,
   },
   hitAreaHorizontal: {
-    left: -5,
     top: 0,
     bottom: 0,
     width: 10,
   },
   hitAreaVertical: {
-    top: -5,
     left: 0,
     right: 0,
     height: 10,
   },
+  touchHitArea: {
+    position: "absolute",
+    zIndex: 10,
+    alignItems: "center",
+    justifyContent: "center",
+  },
+  touchHitAreaHorizontal: {
+    top: "50%",
+    width: 24,
+    height: 88,
+    transform: [{ translateY: -44 }],
+  },
+  touchHitAreaVertical: {
+    left: "50%",
+    width: 88,
+    height: 24,
+    transform: [{ translateX: -44 }],
+  },
+  touchGrip: {
+    borderRadius: 2,
+  },
+  touchGripHorizontal: {
+    width: 4,
+    height: 36,
+  },
+  touchGripVertical: {
+    width: 36,
+    height: 4,
+  },
+  touchGripHidden: {
+    opacity: 0.12,
+  },
+  touchGripVisible: {
+    opacity: 0.3,
+  },
 }));

packages/app/src/components/sidebar-workspace-list.tsx

@@ -37,14 +37,7 @@ import type { SidebarSurfaceBackdrop } from "@/styles/surface-backdrop";
 import { getSidebarRowBackdrop } from "@/components/sidebar/sidebar-row-backdrop";
 import { type GestureType } from "react-native-gesture-handler";
 import * as Clipboard from "expo-clipboard";
-import {
+import { ExternalLink, Settings, MoreVertical, Plus, Trash2 } from "lucide-react-native";
-  ExternalLink,
-  GitPullRequest,
-  Settings,
-  MoreVertical,
-  Plus,
-  Trash2,
-} from "lucide-react-native";
 import { NestableScrollContainer } from "react-native-draggable-flatlist";
 import { DraggableList, type DraggableRenderItemInfo } from "./draggable-list";
 import type { DraggableListDragHandleProps } from "./draggable-list.types";
@@ -159,6 +152,7 @@ import { useLocalDaemonServerId } from "@/hooks/use-is-local-daemon";
 import type { HostBadgeModel } from "@/hosts/appearance";
 import { useHostBadges } from "@/hosts/use-host-badges";
 import { useSidebarRowItems } from "@/components/sidebar/display-preferences/model";
+import { PullRequestStateIcon } from "@/git/pull-request-state-icon";
 
 const workspaceKeyExtractor = (workspace: SidebarWorkspacePlacement) => workspace.workspaceKey;
 
@@ -166,7 +160,6 @@ const projectViewKeyExtractor = (project: SidebarProjectEntry) => project.viewKe
 
 const WORKSPACE_STATUS_DOT_WIDTH = 14;
 const ThemedExternalLink = withUnistyles(ExternalLink);
-const ThemedGitPullRequest = withUnistyles(GitPullRequest);
 const ThemedLoadingSpinner = withUnistyles(LoadingSpinner);
 const ThemedPlus = withUnistyles(Plus);
 const ThemedMoreVertical = withUnistyles(MoreVertical);
@@ -179,26 +172,6 @@ const foregroundColorMapping = (theme: Theme) => ({
 const foregroundMutedColorMapping = (theme: Theme) => ({
   color: theme.colors.foregroundMuted,
 });
-const redColorMapping = (theme: Theme) => ({
-  color: theme.colors.statusDanger,
-});
-const greenColorMapping = (theme: Theme) => ({
-  color: theme.colors.statusSuccess,
-});
-const purpleColorMapping = (theme: Theme) => ({
-  color: theme.colors.statusMerged,
-});
-
-function getPrIconUniMapping(state: PrHint["state"]) {
-  switch (state) {
-    case "merged":
-      return purpleColorMapping;
-    case "open":
-      return greenColorMapping;
-    case "closed":
-      return redColorMapping;
-  }
-}
 
 function isWorkspaceSelected(input: {
   selection: ActiveWorkspaceSelection | null;
@@ -352,7 +325,6 @@ export function PrBadge({ hint, style }: { hint: PrHint; style?: StyleProp<ViewS
   const textStyle = isHovered
     ? [prBadgeStyles.text, prBadgeStyles.textHovered]
     : prBadgeStyles.text;
-  const iconUniProps = isHovered ? foregroundColorMapping : getPrIconUniMapping(hint.state);
   const presentation = getForgePresentation(normalizeForge(hint.forge));
 
   return (
@@ -370,9 +342,9 @@ export function PrBadge({ hint, style }: { hint: PrHint; style?: StyleProp<ViewS
       style={pressableStyle}
     >
       {isHovered ? (
-        <ThemedExternalLink size={12} uniProps={iconUniProps} />
+        <ThemedExternalLink size={12} uniProps={foregroundColorMapping} />
       ) : (
-        <ThemedGitPullRequest size={12} uniProps={iconUniProps} />
+        <PullRequestStateIcon state={hint.state} size={12} />
       )}
       <Text style={textStyle} numberOfLines={1}>
         {hint.number}

packages/app/src/components/sidebar/workspace-meta-row/index.tsx

@@ -2,15 +2,7 @@ import { Fragment, useCallback, useState, type ReactNode } from "react";
 import { useTranslation } from "react-i18next";
 import { Pressable, Text, View, type GestureResponderEvent } from "react-native";
 import { StyleSheet, withUnistyles } from "react-native-unistyles";
-import {
+import { ExternalLink, Folder, GitBranch, Globe } from "lucide-react-native";
-  ExternalLink,
-  Folder,
-  GitBranch,
-  GitMerge,
-  GitPullRequest,
-  GitPullRequestClosed,
-  Globe,
-} from "lucide-react-native";
 import {
   workspaceLabelKey,
   type WorkspaceLabelDefinition,
@@ -23,6 +15,7 @@ import { getForgePresentation, normalizeForge } from "@/git/forge";
 import { openExternalUrl } from "@/utils/open-external-url";
 import { useSidebarMetaPreferences } from "@/components/sidebar/display-preferences/model";
 import type { Theme } from "@/styles/theme";
+import { PullRequestStateIcon } from "@/git/pull-request-state-icon";
 import { CheckIndicator } from "./check-indicator";
 import type { CheckSummary, CheckSummaryState } from "./check-summary";
 import { selectMetaRowItems, type MetaRowItem } from "./meta-items";
@@ -44,9 +37,6 @@ const META_ICON_SIZE = HOST_BADGE_ICON_SIZE;
 const ThemedExternalLink = withUnistyles(ExternalLink);
 const ThemedFolder = withUnistyles(Folder);
 const ThemedGitBranch = withUnistyles(GitBranch);
-const ThemedGitPullRequest = withUnistyles(GitPullRequest);
-const ThemedGitMerge = withUnistyles(GitMerge);
-const ThemedGitPullRequestClosed = withUnistyles(GitPullRequestClosed);
 const ThemedGlobe = withUnistyles(Globe);
 
 /** Stable identity so a row without labels doesn't re-select its items on every render. */
@@ -54,7 +44,6 @@ const EMPTY_LABELS: readonly WorkspaceLabelDefinition[] = [];
 
 const foregroundMapping = (theme: Theme) => ({ color: theme.colors.foreground });
 const mutedMapping = (theme: Theme) => ({ color: theme.colors.foregroundMuted });
-const mergedMapping = (theme: Theme) => ({ color: theme.colors.statusMerged });
 const dangerMapping = (theme: Theme) => ({ color: theme.colors.statusDanger });
 
 /**
@@ -212,7 +201,6 @@ function PullRequestItem({ hint }: { hint: PrHint }) {
   const handleHoverIn = useCallback(() => setIsHovered(true), []);
   const handleHoverOut = useCallback(() => setIsHovered(false), []);
 
-  const Icon = isHovered ? ThemedExternalLink : PR_ICONS[hint.state];
   return (
     <Pressable
       accessibilityRole="link"
@@ -227,10 +215,11 @@ function PullRequestItem({ hint }: { hint: PrHint }) {
       onHoverOut={handleHoverOut}
       style={pressableItemStyle}
     >
-      <Icon
+      {isHovered ? (
-        size={META_ICON_SIZE}
+        <ThemedExternalLink size={META_ICON_SIZE} uniProps={foregroundMapping} />
-        uniProps={isHovered ? foregroundMapping : PR_COLOR_MAPPINGS[hint.state]}
+      ) : (
-      />
+        <PullRequestStateIcon state={hint.state} size={META_ICON_SIZE} />
+      )}
       <Text style={isHovered ? styles.prTextHovered : styles.prText} numberOfLines={1}>
         {hint.number}
         {/* An open change request is the unremarkable case and says nothing extra; a merged
@@ -311,20 +300,6 @@ function ServiceItem({ summary }: { summary: WorkspaceServiceSummary }) {
 
 const successMapping = (theme: Theme) => ({ color: theme.colors.statusSuccess });
 
-const PR_ICONS = {
-  open: ThemedGitPullRequest,
-  merged: ThemedGitMerge,
-  closed: ThemedGitPullRequestClosed,
-} as const;
-
-// Same three colours the hover card gives the same three states — a change request has one
-// identity, and it shouldn't shift when you hover the row that names it.
-const PR_COLOR_MAPPINGS = {
-  open: successMapping,
-  merged: mergedMapping,
-  closed: dangerMapping,
-} as const;
-
 const PR_STATE_LABEL_KEYS = {
   merged: "workspace.git.pr.states.merged",
   closed: "workspace.git.pr.states.closed",

packages/app/src/components/split-container-focus.test.ts

@@ -1,5 +1,8 @@
 import { describe, expect, it } from "vitest";
-import { resolveSplitContainerRoot } from "@/components/split-container-focus";
+import {
+  resolveSplitContainerRoot,
+  splitNodeContainsPane,
+} from "@/components/split-container-focus";
 import type { SplitNode } from "@/stores/workspace-layout-store";
 
 const pane = (id: string): SplitNode => ({
@@ -35,25 +38,11 @@ describe("split focus root", () => {
     ).toEqual({ root, usesFallbackStrip: false });
   });
 
-  it("renders only a maximized pane without entering focus mode", () => {
+  it("finds the maximized pane without replacing the rendered split tree", () => {
+    expect(splitNodeContainsPane(root, "right")).toBe(true);
+    expect(splitNodeContainsPane(root, "missing")).toBe(false);
     expect(
-      resolveSplitContainerRoot({
+      resolveSplitContainerRoot({ root, focusedPaneId: "left", focusModeEnabled: false }),
-        root,
-        focusedPaneId: "left",
-        focusModeEnabled: false,
-        maximizedPaneId: "right",
-      }),
-    ).toEqual({ root: pane("right"), usesFallbackStrip: false });
-  });
-
-  it("keeps normal splits when the maximized pane is unavailable", () => {
-    expect(
-      resolveSplitContainerRoot({
-        root,
-        focusedPaneId: "left",
-        focusModeEnabled: false,
-        maximizedPaneId: "missing",
-      }),
     ).toEqual({ root, usesFallbackStrip: false });
   });
 });

packages/app/src/components/split-container-focus.ts

@@ -4,9 +4,8 @@ export function resolveSplitContainerRoot(input: {
   root: SplitNode;
   focusedPaneId: string | null;
   focusModeEnabled: boolean | undefined;
-  maximizedPaneId?: string | null;
 }): { root: SplitNode; usesFallbackStrip: boolean } {
-  const isolatedPaneId = input.focusModeEnabled ? input.focusedPaneId : input.maximizedPaneId;
+  const isolatedPaneId = input.focusModeEnabled ? input.focusedPaneId : null;
   if (!isolatedPaneId) return { root: input.root, usesFallbackStrip: false };
   const isolatedPane = findPane(input.root, isolatedPaneId);
   if (!isolatedPane || isolatedPane.hidden === true) {
@@ -15,6 +14,12 @@ export function resolveSplitContainerRoot(input: {
   return { root: { kind: "pane", pane: isolatedPane }, usesFallbackStrip: false };
 }
 
+/** Whether a split subtree contains the pane currently projected full-size. */
+export function splitNodeContainsPane(node: SplitNode, paneId: string): boolean {
+  if (node.kind === "pane") return node.pane.id === paneId;
+  return node.group.children.some((child) => splitNodeContainsPane(child, paneId));
+}
+
 function findPane(node: SplitNode, paneId: string): SplitPane | null {
   if (node.kind === "pane") return node.pane.id === paneId ? node.pane : null;
   for (const child of node.group.children) {

packages/app/src/components/split-container.tsx

@@ -1,6 +1,5 @@
 import {
   Fragment,
-  memo,
   useCallback,
   useEffect,
   useMemo,
@@ -27,7 +26,7 @@ import {
   type DragStartEvent,
 } from "@dnd-kit/core";
 import { arrayMove, sortableKeyboardCoordinates } from "@dnd-kit/sortable";
-import { View, Text } from "react-native";
+import { View, Text, type LayoutChangeEvent } from "react-native";
 import Animated, {
   useAnimatedStyle,
   useSharedValue,
@@ -36,10 +35,18 @@ import Animated, {
 import { useTranslation } from "react-i18next";
 import { StyleSheet, useUnistyles } from "react-native-unistyles";
 import { ResizeHandle } from "@/components/resize-handle";
+import {
+  resolveExplorerSidebarDockSizes,
+  resolveExplorerSidebarWidth,
+} from "@/components/explorer-sidebar-layout";
 import { RetainedPanel } from "@/components/retained-panel";
-import { resolveSplitContainerRoot } from "@/components/split-container-focus";
+import {
+  resolveSplitContainerRoot,
+  splitNodeContainsPane,
+} from "@/components/split-container-focus";
 import { shouldFocusPaneFromEventTarget } from "@/components/split-container-pane-focus";
 import {
+  removeWindowChromeCorner,
   WindowChromeRegion,
   WindowChromeSafeArea,
   useWindowChromeCorners,
@@ -59,22 +66,20 @@ import {
   deriveWorkspacePaneState,
   getWorkspacePaneDescriptors,
 } from "@/screens/workspace/workspace-pane-state";
-import { useMountedTabSet } from "@/screens/workspace/use-mounted-tab-set";
+import type { WorkspacePaneContentModel } from "@/screens/workspace/workspace-pane-content";
-import { useModifiedPanelTabIds } from "@/panels/panel-instance-attributes";
+import { WorkspacePanelHost } from "@/screens/workspace/workspace-panel-host";
-import {
-  WorkspacePaneContent,
-  type WorkspacePaneContentModel,
-} from "@/screens/workspace/workspace-pane-content";
 import {
   WorkspaceDesktopTabsRow,
   type WorkspaceDesktopTabRowItem,
 } from "@/screens/workspace/workspace-desktop-tabs-row";
+import { ExplorerSidebarDock } from "@/screens/workspace/explorer-sidebar";
 import {
   WorkspaceTabPresentationResolver,
   WorkspaceTabIcon,
 } from "@/screens/workspace/workspace-tab-presentation";
 import type { WorkspaceTabDescriptor } from "@/screens/workspace/workspace-tabs-types";
 import {
+  createDefaultLayout,
   findPaneById,
   useWorkspaceLayoutStore,
   type SplitNode,
@@ -83,13 +88,13 @@ import {
 } from "@/stores/workspace-layout-store";
 import type { WorkspaceTab } from "@/workspace-tabs/model";
 import { RenderProfile } from "@/utils/render-profiler";
-import { workspaceTabTargetsEqual } from "@/workspace-tabs/identity";
 import { isNative } from "@/constants/platform";
-import { useKeyboardActionHandler } from "@/hooks/use-keyboard-action-handler";
+import { panelTargetSupportsHost } from "@/plugins/workspace-panels/locations";
-import type { KeyboardActionDefinition } from "@/keyboard/keyboard-action-dispatcher";
 
 interface SplitContainerProps {
   layout: WorkspaceLayout;
+  renderMainHeader?: () => ReactNode;
+  renderExplorerSidebarHeaderAction?: () => ReactNode;
   workspaceKey: string;
   normalizedServerId: string;
   normalizedWorkspaceId: string;
@@ -125,6 +130,7 @@ interface SplitContainerProps {
     position: "left" | "right" | "top" | "bottom";
   }) => void;
   onMoveTabToPane: (tabId: string, toPaneId: string) => void;
+  onSelectTabInPane: (paneId: string, tabId: string) => void;
   onResizeSplit: (groupId: string, sizes: number[]) => void;
   onReorderTabsInPane: (paneId: string, tabIds: string[]) => void;
   focusModeEnabled?: boolean;
@@ -144,6 +150,7 @@ interface SplitPaneDropData {
 
 const EMPTY_SPLIT_NODES: SplitNode[] = [];
 const EMPTY_SPLIT_SIZES: number[] = [];
+const EXPLORER_SIDEBAR_RESIZE_GROUP_ID = "explorer-sidebar";
 
 function isWorkspaceTabDragData(data: unknown): data is WorkspaceTabDragData {
   return typeof data === "object" && data !== null && Reflect.get(data, "kind") === "workspace-tab";
@@ -165,18 +172,21 @@ function asDragOverData(data: unknown): WorkspaceTabDragData | SplitPaneDropData
   return undefined;
 }
 
-interface SplitNodeViewProps extends Omit<SplitContainerProps, "layout" | "onMoveTabToPane"> {
+interface SplitNodeViewProps extends Omit<
+  SplitContainerProps,
+  "layout" | "onMoveTabToPane" | "onSelectTabInPane"
+> {
   node: SplitNode;
   uiTabs: WorkspaceTab[];
   focusedPaneId: string | null;
-  sidePanelPaneId: string | null;
-  maximizedPaneId: string | null;
-  onTogglePaneMaximized: (paneId: string) => void;
   activeDragTabId: string | null;
   showDropZones: boolean;
   dropPreview: SplitDropZoneHover | null;
   tabDropPreview: TabDropPreview | null;
   windowChromeCorners: WindowChromeCorners;
+  maximizedPaneId: string | null;
+  workspaceHasSplits: boolean;
+  onTogglePaneMaximized: (paneId: string) => void;
 }
 
 interface SplitPaneViewProps extends Omit<
@@ -199,82 +209,6 @@ interface SplitPaneViewProps extends Omit<
   tabDropPreview: TabDropPreview | null;
 }
 
-interface MountedTabSlotProps {
-  tabDescriptor: WorkspaceTabDescriptor;
-  isVisible: boolean;
-  isWorkspaceFocused: boolean;
-  isPaneFocused: boolean;
-  paneId: string;
-  onFocusPane: (paneId: string) => void;
-  buildPaneContentModel: (input: {
-    paneId: string;
-    tab: WorkspaceTabDescriptor;
-  }) => WorkspacePaneContentModel;
-}
-
-const MountedTabSlot = memo(function MountedTabSlot({
-  tabDescriptor,
-  isVisible,
-  isWorkspaceFocused,
-  isPaneFocused,
-  paneId,
-  onFocusPane,
-  buildPaneContentModel,
-}: MountedTabSlotProps) {
-  const content = useMemo(
-    () =>
-      buildPaneContentModel({
-        paneId,
-        tab: tabDescriptor,
-      }),
-    [buildPaneContentModel, paneId, tabDescriptor],
-  );
-
-  const handleFocusPane = useCallback(() => {
-    onFocusPane(paneId);
-  }, [onFocusPane, paneId]);
-
-  return (
-    <RenderProfile id={`DesktopMountedTabSlot:${tabDescriptor.kind}:${tabDescriptor.tabId}`}>
-      <RetainedPanel active={isVisible}>
-        <WorkspacePaneContent
-          content={content}
-          isWorkspaceFocused={isWorkspaceFocused}
-          isPaneFocused={isPaneFocused}
-          onFocusPane={handleFocusPane}
-        />
-      </RetainedPanel>
-    </RenderProfile>
-  );
-});
-
-function useStableTabDescriptorMap(tabDescriptors: WorkspaceTabDescriptor[]) {
-  const cacheRef = useRef(new Map<string, WorkspaceTabDescriptor>());
-  const tabDescriptorMap = useMemo(() => {
-    const next = new Map<string, WorkspaceTabDescriptor>();
-    for (const tabDescriptor of tabDescriptors) {
-      const cachedDescriptor = cacheRef.current.get(tabDescriptor.tabId);
-      if (
-        cachedDescriptor &&
-        cachedDescriptor.key === tabDescriptor.key &&
-        cachedDescriptor.kind === tabDescriptor.kind &&
-        cachedDescriptor.state === tabDescriptor.state &&
-        workspaceTabTargetsEqual(cachedDescriptor.target, tabDescriptor.target)
-      ) {
-        next.set(tabDescriptor.tabId, cachedDescriptor);
-        continue;
-      }
-      next.set(tabDescriptor.tabId, tabDescriptor);
-    }
-    return next;
-  }, [tabDescriptors]);
-  useEffect(() => {
-    cacheRef.current = tabDescriptorMap;
-  }, [tabDescriptorMap]);
-
-  return tabDescriptorMap;
-}
-
 interface DragMoveRects {
   translatedRect: { left: number; top: number; width: number; height: number };
   overRect: { left: number; top: number; width: number; height: number };
@@ -372,6 +306,8 @@ const dropCollisionDetection: CollisionDetection = (args) => {
 
 export function SplitContainer({
   layout,
+  renderMainHeader,
+  renderExplorerSidebarHeaderAction,
   workspaceKey,
   normalizedServerId,
   normalizedWorkspaceId,
@@ -397,6 +333,7 @@ export function SplitContainer({
   onSplitPane,
   onSplitPaneEmpty,
   onMoveTabToPane,
+  onSelectTabInPane,
   onResizeSplit,
   onReorderTabsInPane,
   focusModeEnabled,
@@ -413,56 +350,10 @@ export function SplitContainer({
   } | null>(null);
   const maximizedPaneId =
     maximizedPane?.workspaceKey === workspaceKey ? maximizedPane.paneId : null;
-  const sidePanelPaneId = useWorkspaceLayoutStore(
+  const explorerSidebarPaneId = useWorkspaceLayoutStore(
-    (state) => state.sidePanelPaneIdByWorkspace[workspaceKey] ?? null,
+    (state) => state.explorerSidebarPaneIdByWorkspace[workspaceKey] ?? null,
   );
 
-  useEffect(() => {
-    if (!maximizedPaneId) {
-      return;
-    }
-    const isolatedPane = findPaneById(layout.root, maximizedPaneId);
-    if (focusModeEnabled || !isolatedPane || isolatedPane.hidden === true) {
-      setMaximizedPane(null);
-    }
-  }, [focusModeEnabled, layout.root, maximizedPaneId]);
-
-  const handleTogglePaneMaximized = useCallback(
-    (paneId: string) => {
-      setMaximizedPane((currentPane) =>
-        currentPane?.workspaceKey === workspaceKey && currentPane.paneId === paneId
-          ? null
-          : { workspaceKey, paneId },
-      );
-    },
-    [workspaceKey],
-  );
-
-  const handleExplorerMaximizeAction = useCallback(
-    (action: KeyboardActionDefinition): boolean => {
-      if (action.id !== "workspace.explorer.maximize.toggle") {
-        return false;
-      }
-      const explorerPane = findPaneById(layout.root, sidePanelPaneId);
-      if (focusModeEnabled || !explorerPane || explorerPane.hidden === true) {
-        return true;
-      }
-      onFocusPane(explorerPane.id);
-      handleTogglePaneMaximized(explorerPane.id);
-      return true;
-    },
-    [sidePanelPaneId, focusModeEnabled, handleTogglePaneMaximized, layout.root, onFocusPane],
-  );
-
-  useKeyboardActionHandler({
-    handlerId: `workspace-explorer-maximize:${workspaceKey}`,
-    actions: ["workspace.explorer.maximize.toggle"] as const,
-    enabled: isWorkspaceFocused,
-    priority: 100,
-    isActive: () => true,
-    handle: handleExplorerMaximizeAction,
-  });
-
   const sensors = useSensors(
     useSensor(PointerSensor, {
       activationConstraint: {
@@ -475,15 +366,122 @@ export function SplitContainer({
   );
 
   const panesById = useMemo(() => collectPanesById(layout.root), [layout.root]);
+  const explorerSidebarPane = useMemo(
+    () => findPaneById(layout.root, explorerSidebarPaneId),
+    [layout.root, explorerSidebarPaneId],
+  );
+  const mainRoot = useMemo(
+    () => removePaneFromSplitTree(layout.root, explorerSidebarPaneId),
+    [layout.root, explorerSidebarPaneId],
+  );
+  const workspaceHasSplits = mainRoot?.kind === "group";
+  useEffect(() => {
+    if (
+      maximizedPaneId &&
+      (focusModeEnabled ||
+        !workspaceHasSplits ||
+        !mainRoot ||
+        !splitNodeContainsPane(mainRoot, maximizedPaneId))
+    ) {
+      setMaximizedPane(null);
+    }
+  }, [focusModeEnabled, mainRoot, maximizedPaneId, workspaceHasSplits]);
+  const handleTogglePaneMaximized = useCallback(
+    (paneId: string) => {
+      setMaximizedPane((current) =>
+        current?.workspaceKey === workspaceKey && current.paneId === paneId
+          ? null
+          : { workspaceKey, paneId },
+      );
+    },
+    [workspaceKey],
+  );
+  const handleCreateExplorerTab = useCallback(
+    () => onCreateNewTab({ paneId: explorerSidebarPaneId ?? undefined }),
+    [explorerSidebarPaneId, onCreateNewTab],
+  );
+  const handleMoveExplorerTabToMain = useCallback(
+    (tabId: string) => {
+      if (layout.focusedPaneId) {
+        onMoveTabToPane(tabId, layout.focusedPaneId);
+      }
+    },
+    [layout.focusedPaneId, onMoveTabToPane],
+  );
   const splitRoot = useMemo(
     () =>
       resolveSplitContainerRoot({
-        root: layout.root,
+        root: mainRoot ?? createDefaultLayout().root,
         focusedPaneId: layout.focusedPaneId,
         focusModeEnabled,
-        maximizedPaneId,
       }),
-    [focusModeEnabled, layout.focusedPaneId, layout.root, maximizedPaneId],
+    [focusModeEnabled, layout.focusedPaneId, mainRoot],
+  );
+  const storedExplorerSidebarWidth = useWorkspaceLayoutStore(
+    (state) => state.explorerSidebarWidthByWorkspace[workspaceKey],
+  );
+  const resizeExplorerSidebar = useWorkspaceLayoutStore((state) => state.resizeExplorerSidebar);
+  const [workspaceShellWidth, setWorkspaceShellWidth] = useState(0);
+  const [previewExplorerSidebarWidth, setPreviewExplorerSidebarWidth] = useState<number | null>(
+    null,
+  );
+  const requestedExplorerSidebarWidth = previewExplorerSidebarWidth ?? storedExplorerSidebarWidth;
+  const explorerSidebarWidth = resolveExplorerSidebarWidth({
+    requestedWidth: requestedExplorerSidebarWidth,
+    containerWidth: workspaceShellWidth,
+  });
+  const explorerSidebarDockSizes = useMemo(
+    () =>
+      resolveExplorerSidebarDockSizes({
+        requestedWidth: requestedExplorerSidebarWidth,
+        containerWidth: workspaceShellWidth,
+      }),
+    [requestedExplorerSidebarWidth, workspaceShellWidth],
+  );
+  const renderExplorerSidebarDock = Boolean(
+    !focusModeEnabled && explorerSidebarPane && explorerSidebarPane.hidden !== true,
+  );
+  const mainColumnWindowChromeCorners = renderExplorerSidebarDock
+    ? removeWindowChromeCorner(inheritedWindowChromeCorners, "top-right")
+    : inheritedWindowChromeCorners;
+  const mainColumnStyle = styles.mainColumn;
+  const explorerSidebarDockStyle = useMemo(
+    () => [styles.explorerSidebarDock, { width: explorerSidebarWidth }],
+    [explorerSidebarWidth],
+  );
+  const handleWorkspaceShellLayout = useCallback((event: LayoutChangeEvent) => {
+    const nextWidth = event.nativeEvent.layout.width;
+    setWorkspaceShellWidth((current) => (current === nextWidth ? current : nextWidth));
+  }, []);
+  const previewExplorerSidebarResize = useCallback(
+    (_groupId: string, sizes: number[]) => {
+      const nextRatio = sizes[1];
+      if (nextRatio !== undefined) {
+        setPreviewExplorerSidebarWidth(
+          resolveExplorerSidebarWidth({
+            requestedWidth: nextRatio * workspaceShellWidth,
+            containerWidth: workspaceShellWidth,
+          }),
+        );
+      }
+    },
+    [workspaceShellWidth],
+  );
+  const commitExplorerSidebarResize = useCallback(
+    (_groupId: string, sizes: number[]) => {
+      setPreviewExplorerSidebarWidth(null);
+      const nextRatio = sizes[1];
+      if (nextRatio !== undefined) {
+        resizeExplorerSidebar(
+          workspaceKey,
+          resolveExplorerSidebarWidth({
+            requestedWidth: nextRatio * workspaceShellWidth,
+            containerWidth: workspaceShellWidth,
+          }),
+        );
+      }
+    },
+    [resizeExplorerSidebar, workspaceKey, workspaceShellWidth],
   );
   const renderRoot = useMemo(() => wrapRootPaneForStableMount(splitRoot.root), [splitRoot.root]);
   const handleDragStart = useCallback((event: DragStartEvent) => {
@@ -521,6 +519,21 @@ export function SplitContainer({
         return;
       }
 
+      const activeTab = uiTabs.find((tab) => tab.tabId === activeData.tabId) ?? null;
+      const destinationPaneId =
+        overData?.kind === "workspace-tab" || overData?.kind === "split-pane-drop"
+          ? overData.paneId
+          : null;
+      const destinationHost = destinationPaneId === explorerSidebarPaneId ? "explorer" : "main";
+      if (
+        !activeTab ||
+        !panelTargetSupportsHost(normalizedServerId, activeTab.target, destinationHost)
+      ) {
+        setDropPreview(null);
+        setTabDropPreview(null);
+        return;
+      }
+
       if (overData?.kind === "workspace-tab") {
         const preview = computeTabOverDropPreview({
           activeData,
@@ -542,7 +555,7 @@ export function SplitContainer({
 
       setDropPreview(computePaneOverDropPreview({ overData, rects }));
     },
-    [panesById, uiTabs],
+    [normalizedServerId, panesById, explorerSidebarPaneId, uiTabs],
   );
 
   const applyTabDropEnd = useCallback(
@@ -639,47 +652,90 @@ export function SplitContainer({
         onDragCancel={handleDragCancel}
         onDragEnd={handleDragEnd}
       >
-        {splitRoot.usesFallbackStrip && <WindowChromeSafeArea placement="below" />}
+        <View style={styles.workspaceShell} onLayout={handleWorkspaceShellLayout}>
-        <SplitNodeView
+          <WindowChromeRegion corners={mainColumnWindowChromeCorners}>
-          node={renderRoot}
+            <View style={mainColumnStyle}>
-          workspaceKey={workspaceKey}
+              {renderMainHeader?.()}
-          uiTabs={uiTabs}
+              {splitRoot.usesFallbackStrip && <WindowChromeSafeArea placement="below" />}
-          focusedPaneId={layout.focusedPaneId}
+              {renderRoot ? (
-          sidePanelPaneId={sidePanelPaneId}
+                <SplitNodeView
-          maximizedPaneId={maximizedPaneId}
+                  node={renderRoot}
-          onTogglePaneMaximized={handleTogglePaneMaximized}
+                  workspaceKey={workspaceKey}
-          normalizedServerId={normalizedServerId}
+                  uiTabs={uiTabs}
-          normalizedWorkspaceId={normalizedWorkspaceId}
+                  focusedPaneId={layout.focusedPaneId}
-          isWorkspaceFocused={isWorkspaceFocused}
+                  normalizedServerId={normalizedServerId}
-          hoveredCloseTabKey={hoveredCloseTabKey}
+                  normalizedWorkspaceId={normalizedWorkspaceId}
-          setHoveredCloseTabKey={setHoveredCloseTabKey}
+                  isWorkspaceFocused={isWorkspaceFocused}
-          closingTabIds={closingTabIds}
+                  hoveredCloseTabKey={hoveredCloseTabKey}
-          onNavigateTab={onNavigateTab}
+                  setHoveredCloseTabKey={setHoveredCloseTabKey}
-          onCloseTab={onCloseTab}
+                  closingTabIds={closingTabIds}
-          onCopyResumeCommand={onCopyResumeCommand}
+                  onNavigateTab={onNavigateTab}
-          onCopyAgentId={onCopyAgentId}
+                  onCloseTab={onCloseTab}
-          onCopyTerminalId={onCopyTerminalId}
+                  onCopyResumeCommand={onCopyResumeCommand}
-          onCopyFilePath={onCopyFilePath}
+                  onCopyAgentId={onCopyAgentId}
-          onReloadAgent={onReloadAgent}
+                  onCopyTerminalId={onCopyTerminalId}
-          onRenameTab={onRenameTab}
+                  onCopyFilePath={onCopyFilePath}
-          onCloseTabsToLeft={onCloseTabsToLeft}
+                  onReloadAgent={onReloadAgent}
-          onCloseTabsToRight={onCloseTabsToRight}
+                  onRenameTab={onRenameTab}
-          onCloseOtherTabs={onCloseOtherTabs}
+                  onCloseTabsToLeft={onCloseTabsToLeft}
-          onCreateNewTab={onCreateNewTab}
+                  onCloseTabsToRight={onCloseTabsToRight}
-          buildPaneContentModel={buildPaneContentModel}
+                  onCloseOtherTabs={onCloseOtherTabs}
-          onFocusPane={onFocusPane}
+                  onCreateNewTab={onCreateNewTab}
-          onSplitPane={onSplitPane}
+                  buildPaneContentModel={buildPaneContentModel}
-          onSplitPaneEmpty={onSplitPaneEmpty}
+                  onFocusPane={onFocusPane}
-          onResizeSplit={onResizeSplit}
+                  onSplitPane={onSplitPane}
-          onReorderTabsInPane={onReorderTabsInPane}
+                  onSplitPaneEmpty={onSplitPaneEmpty}
-          activeDragTabId={activeDragTabId}
+                  onResizeSplit={onResizeSplit}
-          showDropZones={activeDragTabId !== null}
+                  onReorderTabsInPane={onReorderTabsInPane}
-          dropPreview={dropPreview}
+                  activeDragTabId={activeDragTabId}
-          tabDropPreview={tabDropPreview}
+                  showDropZones={activeDragTabId !== null}
-          windowChromeCorners={splitRoot.usesFallbackStrip ? "none" : windowChromeCorners}
+                  dropPreview={dropPreview}
-          focusModeEnabled={focusModeEnabled}
+                  tabDropPreview={tabDropPreview}
-          onExitFocusMode={onExitFocusMode}
+                  windowChromeCorners={splitRoot.usesFallbackStrip ? "none" : windowChromeCorners}
-        />
+                  maximizedPaneId={maximizedPaneId}
+                  workspaceHasSplits={workspaceHasSplits}
+                  onTogglePaneMaximized={handleTogglePaneMaximized}
+                  focusModeEnabled={focusModeEnabled}
+                  onExitFocusMode={onExitFocusMode}
+                />
+              ) : null}
+            </View>
+          </WindowChromeRegion>
+          {renderExplorerSidebarDock && explorerSidebarPane ? (
+            <>
+              <ResizeHandle
+                testID="workspace-explorer-sidebar-resize-handle"
+                direction="horizontal"
+                hitAreaAlignment="end"
+                groupId={EXPLORER_SIDEBAR_RESIZE_GROUP_ID}
+                index={0}
+                sizes={explorerSidebarDockSizes}
+                containerSize={workspaceShellWidth}
+                onPreviewResizeSplit={previewExplorerSidebarResize}
+                onResizeSplit={commitExplorerSidebarResize}
+              />
+              <View style={explorerSidebarDockStyle}>
+                <ExplorerSidebarDock
+                  pane={explorerSidebarPane}
+                  uiTabs={uiTabs}
+                  normalizedServerId={normalizedServerId}
+                  normalizedWorkspaceId={normalizedWorkspaceId}
+                  isWorkspaceFocused={isWorkspaceFocused}
+                  closingTabIds={closingTabIds}
+                  onSelectTab={onSelectTabInPane}
+                  onCloseTab={onCloseTab}
+                  onCreateNewTab={handleCreateExplorerTab}
+                  onMoveTabToMain={handleMoveExplorerTabToMain}
+                  buildPaneContentModel={buildPaneContentModel}
+                  onReorderTabsInPane={onReorderTabsInPane}
+                  activeDragTabId={activeDragTabId}
+                  tabDropPreview={tabDropPreview}
+                  headerAction={renderExplorerSidebarHeaderAction?.()}
+                />
+              </View>
+            </>
+          ) : null}
+        </View>
         <DragOverlay dropAnimation={null}>
           {activeDragTabId ? (
             <DragOverlayTabChip
@@ -825,16 +881,35 @@ function SplitGroupChild({
  * hidden pane give its space back instead of just going invisible. The stored `sizes` are never
  * touched, so unhiding restores the width the user dragged to.
  */
-function resolveVisibleGroupFlex(children: SplitNode[], sizes: number[]): number[] {
+function resolveVisibleGroupFlex(
+  children: SplitNode[],
+  sizes: number[],
+  maximizedPaneId: string | null,
+): number[] {
   const visibleTotal = children.reduce(
-    (total, child, index) => (isSplitNodeHidden(child) ? total : total + (sizes[index] ?? 1)),
+    (total, child, index) =>
+      isSplitNodeHiddenForPresentation(child, maximizedPaneId)
+        ? total
+        : total + (sizes[index] ?? 1),
     0,
   );
   if (visibleTotal <= 0) {
     return children.map(() => 0);
   }
   return children.map((child, index) =>
-    isSplitNodeHidden(child) ? 0 : (sizes[index] ?? 1) / visibleTotal,
+    isSplitNodeHiddenForPresentation(child, maximizedPaneId)
+      ? 0
+      : (sizes[index] ?? 1) / visibleTotal,
+  );
+}
+
+function isSplitNodeHiddenForPresentation(
+  node: SplitNode,
+  maximizedPaneId: string | null,
+): boolean {
+  return (
+    isSplitNodeHidden(node) ||
+    Boolean(maximizedPaneId && !splitNodeContainsPane(node, maximizedPaneId))
   );
 }
 
@@ -850,9 +925,6 @@ function SplitNodeView({
   workspaceKey,
   uiTabs,
   focusedPaneId,
-  sidePanelPaneId,
-  maximizedPaneId,
-  onTogglePaneMaximized,
   normalizedServerId,
   normalizedWorkspaceId,
   isWorkspaceFocused,
@@ -882,9 +954,13 @@ function SplitNodeView({
   dropPreview,
   tabDropPreview,
   windowChromeCorners,
+  maximizedPaneId,
+  workspaceHasSplits,
+  onTogglePaneMaximized,
   focusModeEnabled,
   onExitFocusMode,
 }: SplitNodeViewProps) {
+  const [groupContainerSize, setGroupContainerSize] = useState(0);
   const groupId = node.kind === "group" ? node.group.id : null;
   const groupDirection = node.kind === "group" ? node.group.direction : null;
 
@@ -895,8 +971,8 @@ function SplitNodeView({
   const groupSizes =
     storedGroupSizes ?? (node.kind === "group" ? node.group.sizes : EMPTY_SPLIT_SIZES);
   const visibleFlex = useMemo(
-    () => resolveVisibleGroupFlex(groupChildren, groupSizes),
+    () => resolveVisibleGroupFlex(groupChildren, groupSizes, maximizedPaneId),
-    [groupChildren, groupSizes],
+    [groupChildren, groupSizes, maximizedPaneId],
   );
   const resizeFlex = useSharedValue(visibleFlex);
   useEffect(() => {
@@ -904,9 +980,19 @@ function SplitNodeView({
   }, [resizeFlex, visibleFlex]);
   const previewResizeSplit = useCallback(
     (_groupId: string, sizes: number[]) => {
-      resizeFlex.value = resolveVisibleGroupFlex(groupChildren, sizes);
+      resizeFlex.value = resolveVisibleGroupFlex(groupChildren, sizes, maximizedPaneId);
     },
-    [groupChildren, resizeFlex],
+    [groupChildren, maximizedPaneId, resizeFlex],
+  );
+  const handleGroupLayout = useCallback(
+    (event: LayoutChangeEvent) => {
+      const nextSize =
+        groupDirection === "horizontal"
+          ? event.nativeEvent.layout.width
+          : event.nativeEvent.layout.height;
+      setGroupContainerSize((current) => (current === nextSize ? current : nextSize));
+    },
+    [groupDirection],
   );
 
   const groupStyle = useMemo(
@@ -919,15 +1005,14 @@ function SplitNodeView({
 
   if (node.kind === "pane") {
     return (
-      <RetainedPanel active={node.pane.hidden !== true}>
+      <RetainedPanel
+        active={node.pane.hidden !== true && (!maximizedPaneId || node.pane.id === maximizedPaneId)}
+      >
         <WindowChromeRegion corners={windowChromeCorners}>
           <SplitPaneView
             pane={node.pane}
             uiTabs={uiTabs}
             isFocused={node.pane.id === focusedPaneId}
-            sidePanelPaneId={sidePanelPaneId}
-            maximizedPaneId={maximizedPaneId}
-            onTogglePaneMaximized={onTogglePaneMaximized}
             normalizedServerId={normalizedServerId}
             normalizedWorkspaceId={normalizedWorkspaceId}
             isWorkspaceFocused={isWorkspaceFocused}
@@ -955,6 +1040,9 @@ function SplitNodeView({
             showDropZones={showDropZones}
             dropPreview={dropPreview}
             tabDropPreview={tabDropPreview}
+            maximizedPaneId={maximizedPaneId}
+            workspaceHasSplits={workspaceHasSplits}
+            onTogglePaneMaximized={onTogglePaneMaximized}
             focusModeEnabled={focusModeEnabled}
             onExitFocusMode={onExitFocusMode}
           />
@@ -964,18 +1052,19 @@ function SplitNodeView({
   }
 
   return (
-    <View style={groupStyle}>
+    <View style={groupStyle} onLayout={handleGroupLayout}>
       {node.group.children.map((child, index) => (
         <Fragment key={getNodeKey(child)}>
-          <SplitGroupChild resizeFlex={resizeFlex} index={index} hidden={isSplitNodeHidden(child)}>
+          <SplitGroupChild
+            resizeFlex={resizeFlex}
+            index={index}
+            hidden={isSplitNodeHiddenForPresentation(child, maximizedPaneId)}
+          >
             <SplitNodeView
               node={child}
               workspaceKey={workspaceKey}
               uiTabs={uiTabs}
               focusedPaneId={focusedPaneId}
-              sidePanelPaneId={sidePanelPaneId}
-              maximizedPaneId={maximizedPaneId}
-              onTogglePaneMaximized={onTogglePaneMaximized}
               normalizedServerId={normalizedServerId}
               normalizedWorkspaceId={normalizedWorkspaceId}
               isWorkspaceFocused={isWorkspaceFocused}
@@ -1005,19 +1094,23 @@ function SplitNodeView({
               dropPreview={dropPreview}
               tabDropPreview={tabDropPreview}
               windowChromeCorners={windowChromeCorners}
+              maximizedPaneId={maximizedPaneId}
+              workspaceHasSplits={workspaceHasSplits}
+              onTogglePaneMaximized={onTogglePaneMaximized}
               focusModeEnabled={focusModeEnabled}
               onExitFocusMode={onExitFocusMode}
             />
           </SplitGroupChild>
           {index < node.group.children.length - 1 &&
-          !isSplitNodeHidden(child) &&
+          !isSplitNodeHiddenForPresentation(child, maximizedPaneId) &&
-          !isSplitNodeHidden(node.group.children[index + 1]) ? (
+          !isSplitNodeHiddenForPresentation(node.group.children[index + 1], maximizedPaneId) ? (
             <ResizeHandle
               testID="workspace-split-resize-handle"
               direction={node.group.direction}
               groupId={node.group.id}
               index={index}
               sizes={groupSizes}
+              containerSize={groupContainerSize}
               onPreviewResizeSplit={previewResizeSplit}
               onResizeSplit={onResizeSplit}
             />
@@ -1053,19 +1146,18 @@ function SplitPaneView({
   buildPaneContentModel,
   onFocusPane,
   onSplitPane: _onSplitPane,
-  onSplitPaneEmpty: _onSplitPaneEmpty,
+  onSplitPaneEmpty,
   onReorderTabsInPane,
   activeDragTabId,
   showDropZones,
   dropPreview,
   tabDropPreview,
-  sidePanelPaneId,
   maximizedPaneId,
+  workspaceHasSplits,
   onTogglePaneMaximized,
   focusModeEnabled,
   onExitFocusMode,
 }: SplitPaneViewProps) {
-  const { theme: _theme } = useUnistyles();
   const paneRef = useRef<View | null>(null);
   const stableOnFocusPane = useStableEvent(onFocusPane);
   const paneState = useMemo(
@@ -1077,24 +1169,7 @@ function SplitPaneView({
     [pane, uiTabs],
   );
   const paneTabs = useMemo(() => paneState.tabs.map((tab) => tab.descriptor), [paneState.tabs]);
-  const paneTabIds = useMemo(() => paneTabs.map((tab) => tab.tabId), [paneTabs]);
-  const modifiedPaneTabIds = useModifiedPanelTabIds({
-    serverId: normalizedServerId,
-    workspaceId: normalizedWorkspaceId,
-    tabIds: paneTabIds,
-  });
-  const tabDescriptorMap = useStableTabDescriptorMap(paneTabs);
   const activeTabDescriptor = paneState.activeTab?.descriptor ?? null;
-  const { mountedTabIds } = useMountedTabSet({
-    activeTabId: activeTabDescriptor?.tabId ?? null,
-    allTabIds: paneTabIds,
-    retainedTabIds: modifiedPaneTabIds,
-    cap: 3,
-  });
-  const mountedPaneTabIds = useMemo(
-    () => paneTabIds.filter((tabId) => mountedTabIds.has(tabId)),
-    [mountedTabIds, paneTabIds],
-  );
   const desktopTabRowItems = useMemo<WorkspaceDesktopTabRowItem[]>(
     () =>
       paneTabs.map((tab) => ({
@@ -1162,7 +1237,15 @@ function SplitPaneView({
     },
     [onReorderTabsInPane, paneId],
   );
-  const handleToggleMaximized = useCallback(
+  const handleSplitRight = useCallback(
+    () => onSplitPaneEmpty({ targetPaneId: paneId, position: "right" }),
+    [onSplitPaneEmpty, paneId],
+  );
+  const handleSplitDown = useCallback(
+    () => onSplitPaneEmpty({ targetPaneId: paneId, position: "bottom" }),
+    [onSplitPaneEmpty, paneId],
+  );
+  const handleTogglePaneMaximized = useCallback(
     () => onTogglePaneMaximized(paneId),
     [onTogglePaneMaximized, paneId],
   );
@@ -1172,7 +1255,7 @@ function SplitPaneView({
         ref={paneRef}
         collapsable={false}
         style={styles.pane}
-        testID={pane.id === sidePanelPaneId ? "workspace-side-panel" : `workspace-pane-${pane.id}`}
+        testID={`workspace-pane-${pane.id}`}
       >
         <WindowChromeSafeArea placement="inline" style={styles.paneTabs}>
           <TitlebarDragRegion />
@@ -1201,34 +1284,29 @@ function SplitPaneView({
             tabDropPreviewIndex={
               tabDropPreview?.paneId === pane.id ? tabDropPreview.indicatorIndex : null
             }
-            showPaneMaximizeAction={pane.id === sidePanelPaneId && !focusModeEnabled}
+            showPaneSplitActions={!focusModeEnabled}
-            paneMaximized={pane.id === maximizedPaneId}
+            showPaneMaximizeAction={workspaceHasSplits && !focusModeEnabled}
-            onTogglePaneMaximized={handleToggleMaximized}
+            paneMaximized={paneId === maximizedPaneId}
+            onTogglePaneMaximized={handleTogglePaneMaximized}
+            onSplitRight={handleSplitRight}
+            onSplitDown={handleSplitDown}
             focusModeEnabled={Boolean(focusModeEnabled)}
             onExitFocusMode={onExitFocusMode}
           />
         </WindowChromeSafeArea>
 
         <View style={styles.paneContent}>
-          {mountedPaneTabIds.map((tabId) => {
+          <WorkspacePanelHost
-            const tabDescriptor = tabDescriptorMap.get(tabId);
+            paneId={pane.id}
-            if (!tabDescriptor) {
+            tabs={paneTabs}
-              return null;
+            activeTabId={activeTabDescriptor?.tabId ?? null}
-            }
+            normalizedServerId={normalizedServerId}
-
+            normalizedWorkspaceId={normalizedWorkspaceId}
-            return (
+            isWorkspaceFocused={isWorkspaceFocused}
-              <MountedTabSlot
+            isPaneFocused={isFocused}
-                key={tabId}
+            onFocusPane={stableOnFocusPane}
-                tabDescriptor={tabDescriptor}
+            buildPaneContentModel={buildPaneContentModel}
-                isVisible={tabId === activeTabDescriptor?.tabId}
+          />
-                isWorkspaceFocused={isWorkspaceFocused}
-                isPaneFocused={isFocused && tabId === activeTabDescriptor?.tabId}
-                paneId={pane.id}
-                onFocusPane={stableOnFocusPane}
-                buildPaneContentModel={buildPaneContentModel}
-              />
-            );
-          })}
           <SplitDropZone paneId={pane.id} active={showDropZones} preview={dropPreview} />
         </View>
       </View>
@@ -1274,7 +1352,53 @@ function wrapRootPaneForStableMount(node: SplitNode): SplitNode {
   };
 }
 
+function removePaneFromSplitTree(node: SplitNode, paneId: string | null): SplitNode | null {
+  if (!paneId) {
+    return node;
+  }
+  if (node.kind === "pane") {
+    return node.pane.id === paneId ? null : node;
+  }
+
+  const children = node.group.children.flatMap((child) => {
+    const nextChild = removePaneFromSplitTree(child, paneId);
+    return nextChild ? [nextChild] : [];
+  });
+  if (children.length === 0) {
+    return null;
+  }
+  if (children.length === 1) {
+    return children[0] ?? null;
+  }
+  return {
+    kind: "group",
+    group: {
+      ...node.group,
+      children,
+      sizes: children.map(() => 1 / children.length),
+    },
+  };
+}
+
 const styles = StyleSheet.create((theme) => ({
+  workspaceShell: {
+    flex: 1,
+    minWidth: 0,
+    minHeight: 0,
+    flexDirection: "row",
+  },
+  mainColumn: {
+    flex: 1,
+    flexShrink: 1,
+    minWidth: 0,
+    minHeight: 0,
+  },
+  explorerSidebarDock: {
+    flexShrink: 0,
+    minWidth: 240,
+    minHeight: 0,
+    backgroundColor: theme.colors.surfaceSidebar,
+  },
   group: {
     flex: 1,
     minWidth: 0,

packages/app/src/components/tree-primitives.tsx

@@ -18,7 +18,8 @@ export const WORKSPACE_TREE_ICON_LABEL_GAP = SPACING[2];
  * The extra 2px is optical: text ink ends inside its layout box, while the
  * header icons' strokes extend to theirs.
  */
-export const WORKSPACE_FILE_ROW_TRAILING_PADDING = SPACING[4] + 2;
+/** Shared painted-edge rail for pane headers, toolbars, and tree/diff rows. */
+export const WORKSPACE_PANE_TRAILING_GLYPH_RAIL = SPACING[2];
 
 /** Left padding for a row in either workspace tree. */
 export function treeRowPaddingLeft(depth: number): number {
@@ -49,7 +50,7 @@ export const workspaceTreeRowStyles = StyleSheet.create((theme: Theme) => ({
     alignItems: "center",
     justifyContent: "space-between",
     paddingVertical: WORKSPACE_FILE_ROW_VERTICAL_PADDING,
-    paddingRight: WORKSPACE_FILE_ROW_TRAILING_PADDING,
+    paddingRight: WORKSPACE_PANE_TRAILING_GLYPH_RAIL,
   },
   active: {
     backgroundColor: theme.colors.surfaceSidebarHover,