Replace the stateful TitlebarDragRegion (hooks, ResizeObserver, IPC,
fullscreen tracking) with a pure static component — matching VS Code's
titlebar-drag-region exactly: position absolute, full size, no z-index,
no pointer-events, no state, no event listeners.
Remove TitlebarNoDragContent entirely — VS Code doesn't wrap content in
no-drag; interactive elements get no-drag from the global CSS backstop
in index.html.
Add drag regions to all header surfaces:
- ScreenHeader (sessions, workspace header)
- Left sidebar (traffic light area + header)
- Split container pane tabs
- Explorer sidebar header (Changes/Files tabs)
Fix workspace header empty space not draggable by changing
headerTitleContainer from flex: 1 to flexShrink: 1.
Replaces useTrafficLightPadding with a role-based useWindowControlsPadding
hook that absorbs all layout-conditional logic (sidebar state, focus mode,
explorer state). Consumers no longer make platform or layout decisions —
they just apply the resolved padding values.
Fixes Windows title bar overlay buttons overlapping source control icons
when the left sidebar is open, and right padding not shifting to the
explorer sidebar header when it's open.
Also fixes borderless header using borderBottomWidth:0 (layout shift)
instead of transparent, and double-click-to-maximize bounce on the
open project screen caused by nested drag handlers.
Use titleBarStyle: 'hidden' on all platforms. On Windows/Linux, enable
titleBarOverlay with dark theme colors for native min/max/close buttons.
Extend useTrafficLightPadding to return side ('left'|'right'|null) so
consumers apply padding on the correct side per platform.
Hides ScreenHeader, LeftSidebar, and ExplorerSidebar on desktop,
replacing the split layout with the single focused pane. Respects
macOS traffic light padding in the tab bar when active. Shortcut
is restricted to workspace screens. Also nudges traffic light
buttons up 3px globally.
- Add useCloseTabs hook to centralize tab close state with stable closeTab callback and reactive closingTabIds
- Replace killTerminalMutation/isArchivingAgent props with closingTabIds Set in split container
- Stabilize archiveAgent callback by depending on mutateAsync instead of whole mutation object
- Add bail-out to focusTabInLayout and focusPaneInLayout when already focused
- Remove redundant isArchivingAgent guard (closeTab handles dedup)
Move tab switcher from bottom to top (after header), restyle as a
clean pressable row with chevron instead of count badge. Add "New
agent" and "New terminal" to header kebab menu. Fix BottomSheet
portal crash by nesting BottomSheetModalProvider inside QueryProvider.
