Refactor desktop app into separate client and proxy apps

apps/yaak-client/hooks/useWindowFocus.ts

@@ -0,0 +1,18 @@
+import { getCurrentWebviewWindow } from '@tauri-apps/api/webviewWindow';
+import { useEffect, useState } from 'react';
+
+export function useWindowFocus() {
+  const [visible, setVisible] = useState(true);
+
+  useEffect(() => {
+    const unlisten = getCurrentWebviewWindow().onFocusChanged((e) => {
+      setVisible(e.payload);
+    });
+
+    return () => {
+      unlisten.then((fn) => fn());
+    };
+  }, []);
+
+  return visible;
+}