feat: Add desktop Open In button (#350)

* feat: add OpenInAppButton and macOS path opener

* feat: filter installed apps on macOS and use in OpenInAppButton

* feat: fetch and display macOS app icons in OpenInAppButton

* feat(desktop): cache and fetch installed macOS apps

* feat: add force refresh and retry for installed apps

* feat(OpenInAppButton): add Copy Path action in dropdown header

* feat: enhance caching mechanism for apps discovery

---------

Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>

packages/ui/src/App.tsx

@@ -56,6 +56,7 @@ function App({ apis }: AppProps) {
   const refreshGitHubAuthStatus = useGitHubAuthStore((state) => state.refreshStatus);
   const [isVSCodeRuntime, setIsVSCodeRuntime] = React.useState<boolean>(() => apis.runtime.isVSCode);
   const [showCliOnboarding, setShowCliOnboarding] = React.useState(false);
+  const appReadyDispatchedRef = React.useRef(false);
 
   React.useEffect(() => {
     setIsVSCodeRuntime(apis.runtime.isVSCode);
@@ -157,6 +158,15 @@ function App({ apis }: AppProps) {
     syncDirectoryAndSessions();
   }, [currentDirectory, isSwitchingDirectory, loadSessions, isConnected, isVSCodeRuntime]);
 
+  React.useEffect(() => {
+    if (typeof window === 'undefined') return;
+    if (!isInitialized || isSwitchingDirectory) return;
+    if (appReadyDispatchedRef.current) return;
+    appReadyDispatchedRef.current = true;
+    (window as unknown as { __openchamberAppReady?: boolean }).__openchamberAppReady = true;
+    window.dispatchEvent(new Event('openchamber:app-ready'));
+  }, [isInitialized, isSwitchingDirectory]);
+
   useEventStream();
 
   // Server-authoritative session status polling