* feat(app): open files and subagents in a closable sheet on compact
On phones, opening a file, a provider subagent, or a Paseo subagent now shows it
in a bottom sheet over the current tab instead of adding a tab, so the tab strip
stays for terminals and root agents. Paseo subagents get "Open as tab" to move
the same tab (same tabId and state) into a full tab with a composer; agents in a
sheet hide the composer.
The decision lives in the workspace layout store's openTab, driven by a
per-kind `compactSheet` rule in the panel manifest, so every open path (chat
links, Explorer, subagents track, notifications, plugins) follows it without
call-site branching, and a new kind opts in with one manifest entry. The app
shell publishes the layout mode (compact / single-pane / split-panes) once, so
callers stop passing isCompact for placement.
A sheet holding unsaved edits is never implicitly displaced; later opens go to
tabs underneath, and closing it goes through the existing discard guard. The
editor host is position: sticky because CodeMirror's scrollIntoView otherwise
scrolls the bottom sheet's container and drags the sheet to full height.
* test(app): fail the compact sheet snap check when the sheet is oversized
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Co-authored-by: paseo-bot[bot] <paseo-bot[bot]@users.noreply.github.com>
* feat(files): edit workspace files on web
Keep source buffers synchronized with host file changes and require an explicit overwrite or reload when revisions diverge.
* feat(panels): surface and protect modified tabs
Expose tooltip and modification state through the generic panel boundary so tabs can show stable metadata and guard every close route consistently.
* fix(tests): use portable fake timeout handle
* fix(files): harden editor conflict handling
Preserve modified panel state across tab eviction, use precise revisions for optimistic writes, coalesce concurrent file watchers, and localize the editor interface.
* fix(files): close editor concurrency gaps
Coalesce clean reloads, preserve subscriber identities and file permissions, suspend pending saves during close confirmation, and carry precise revisions through file reads.
* test(files): expect read revision metadata
