feat: add desktop quick open workflow (#925)

Introduce a dedicated Quick Open dialog, wire it to Cmd+P and the macOS app menu, and show file-type icons in quick-open results so file navigation matches the rest of the app.

packages/ui/src/hooks/useKeyboardShortcuts.ts

@@ -18,6 +18,7 @@ export const useKeyboardShortcuts = () => {
   const currentSessionId = useSessionUIStore((s) => s.currentSessionId);
     const abortCurrentOperation = sessionActions.abortCurrentOperation;;
   const toggleCommandPalette = useUIStore((s) => s.toggleCommandPalette);
+  const setQuickOpenOpen = useUIStore((s) => s.setQuickOpenOpen);
   const toggleHelpDialog = useUIStore((s) => s.toggleHelpDialog);
   const toggleSidebar = useUIStore((s) => s.toggleSidebar);
   const toggleRightSidebar = useUIStore((s) => s.toggleRightSidebar);
@@ -61,6 +62,12 @@ export const useKeyboardShortcuts = () => {
         return;
       }
 
+      if (eventMatchesShortcut(e, combo('open_quick_open'))) {
+        e.preventDefault();
+        setQuickOpenOpen(true);
+        return;
+      }
+
       if (eventMatchesShortcut(e, combo('open_status'))) {
         e.preventDefault();
         void showOpenCodeStatus();
@@ -414,6 +421,7 @@ export const useKeyboardShortcuts = () => {
     openNewSessionDraft,
     abortCurrentOperation,
     toggleCommandPalette,
+    setQuickOpenOpen,
     toggleHelpDialog,
     toggleSidebar,
     toggleRightSidebar,