refactor(app): move Tauri IPC bridge hooks (tauriBridge/) into app/ where the shell composes them

src/app/tauriBridge/useTrayIconSync.ts

@@ -0,0 +1,12 @@
+import { useEffect } from 'react';
+import { invoke } from '@tauri-apps/api/core';
+import { useAuthStore } from '@/store/authStore';
+
+/** Sync tray-icon visibility with the user's stored setting. Runs once on mount
+ * (initial sync) and again whenever the setting changes. */
+export function useTrayIconSync() {
+  const showTrayIcon = useAuthStore(s => s.showTrayIcon);
+  useEffect(() => {
+    invoke('toggle_tray_icon', { show: showTrayIcon }).catch(console.error);
+  }, [showTrayIcon]);
+}