feat: update the shortcuts in the desktop app for macOS (#96)

* feat(ui): update keyboard shortcuts to use platform-appropriate modifier keys

* fix(macos): update keyboard shortcuts to use Cmd modifier

Change Command Palette shortcut from Ctrl+X to Cmd+K
Update all menu shortcuts to use Cmd instead of Ctrl on macOS

* Fix linter issue

packages/ui/src/App.tsx

@@ -13,6 +13,7 @@ import { useSessionStatusBootstrap } from '@/hooks/useSessionStatusBootstrap';
 import { useSessionAutoCleanup } from '@/hooks/useSessionAutoCleanup';
 import { GitPollingProvider } from '@/hooks/useGitPolling';
 import { useConfigStore } from '@/stores/useConfigStore';
+import { hasModifier } from '@/lib/utils';
 import { useSessionStore } from '@/stores/useSessionStore';
 import { useDirectoryStore } from '@/stores/useDirectoryStore';
 import { opencodeClient } from '@/lib/opencode/client';
@@ -156,7 +157,7 @@ function App({ apis }: AppProps) {
 
   React.useEffect(() => {
     const handleKeyDown = (e: KeyboardEvent) => {
-      if ((e.metaKey || e.ctrlKey) && e.shiftKey && e.key === 'M') {
+      if (hasModifier(e) && e.shiftKey && e.key === 'M') {
         e.preventDefault();
         setShowMemoryDebug(prev => !prev);
       }