Fix desktop layout and window controls at half-screen width (#1983)

* fix(app): preserve desktop layout in half-screen windows

Treat native window controls as physical corner obstructions instead of deriving clearance from compact layout state. Keep 751px windows in desktop mode while preserving usable content when persisted sidebars are wide.

* fix(app): retain sidebar width across window resizes

* fix(app): yield app sidebar to narrow settings

* test(app): wait for mobile sidebar motion to settle

* fix(app): yield navigation to narrow workspace explorer

* fix(app): mark sidebar sizing helpers as worklets

* fix(app): hide app navigation when space is constrained

docs/design.md

@@ -131,6 +131,10 @@ The branching is one `useIsCompactFormFactor()` check at the top of the screen c
 
 The workspace screen (`packages/app/src/screens/workspace/workspace-screen.tsx`) follows a different but parallel rule: tabs collapse on compact, panes split on desktop. The sidebar (`packages/app/src/components/left-sidebar.tsx`) is overlaid on compact and pinned on desktop.
 
+On a narrow desktop route, app navigation yields to the rendered content topology when the remaining width cannot preserve its center target: Settings keeps its 320px list + 400px detail split, and a workspace Explorer keeps its current visible width plus a 400px center pane. That is a topology decision at the app container, not a second compact breakpoint. Temporary width clamps are render-only; widening restores the user's saved sidebar widths.
+
+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.
+
 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

@@ -72,6 +72,17 @@ Starting the service must not create, focus, reveal, or leave behind macOS Simul
 It launches its own Electron-flavored Expo server and passes that URL to Electron.
 Override the CDP port with `PASEO_ELECTRON_REMOTE_DEBUGGING_PORT` when `9223` is busy.
 
+With desktop dev running, verify the real BrowserWindow, titlebar clearance, fullscreen
+transition, and 751-pixel settings split with:
+
+```bash
+npm run verify:electron-cdp --workspace=@getpaseo/desktop
+```
+
+The verifier reads the same `EXPO_PORT` and
+`PASEO_ELECTRON_REMOTE_DEBUGGING_PORT` environment names as desktop dev. Set both when
+testing an isolated instance on non-default ports.
+
 When running a dedicated Electron QA instance against a non-default Expo port, set
 `EXPO_DEV_URL` explicitly. Desktop main defaults to `http://localhost:8081`, so
 `PASEO_PORT=57928` alone starts Metro on 57928 but Electron still loads 8081.