fix: add system tray tooltip (#237)

ui/flutter/lib/app/modules/app/controllers/app_controller.dart

@@ -202,6 +202,7 @@ class AppController extends GetxController with WindowListener, TrayListener {
         onClick: (menuItem) => {windowManager.destroy()},
       ),
     ]);
+    await trayManager.setToolTip('Gopeed');
     await trayManager.setContextMenu(menu);
     trayManager.addListener(this);
   }