* fix(app): stabilize desktop sidebar controls
Keep the left-window-controls toggle mounted across sidebar state changes so its position and tooltip state remain stable. Preserve browser placement and show an explicit Explorer close control only where native right-side controls do not provide one.
* fix(app): suppress inactive sidebar chrome
* 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
