fix: prevent macOS desktop unlock freeze after display sleep (#745)

* Restart the GPU process to recover from macOS compositor freezes

macOS display sleep can leave Chromium's GPU-process display link stuck
on a stale display, so the compositor stops producing frames and the
window looks frozen — unresponsive to clicks and keys — even though the
renderer stays alive.

setupDarwinCompositorWatchdog polls the renderer for frame production
and, on a sustained stall while the window is visible and unlocked,
restarts the GPU process so Chromium rebuilds the display link. This
replaces setupDarwinPaintRefresh, whose invalidate/resize nudges did
not address the dead display link.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* Give compositor watchdog a module home

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Co-authored-by: Mohamed Boudra <boudra.moha@gmail.com>

packages/desktop/src/main.ts

@@ -19,12 +19,12 @@ import {
   getMainWindowChromeOptions,
   getWindowBackgroundColor,
   resolveSystemWindowTheme,
-  setupDarwinPaintRefresh,
   setupWindowResizeEvents,
   setupDefaultContextMenu,
   setupDragDropPrevention,
   buildStandardContextMenuItems,
 } from "./window/window-manager.js";
+import { setupDarwinCompositorWatchdog } from "./window/compositor-watchdog/index.js";
 import { registerDialogHandlers } from "./features/dialogs.js";
 import {
   registerNotificationHandlers,
@@ -398,7 +398,7 @@ async function createMainWindow(): Promise<void> {
     app.dock?.setBadge(devWorktreeName);
   }
 
-  setupDarwinPaintRefresh(mainWindow);
+  setupDarwinCompositorWatchdog(mainWindow);
   setupWindowResizeEvents(mainWindow);
   setupDefaultContextMenu(mainWindow);
   setupDragDropPrevention(mainWindow);