unfocus keyboard on app hide

lib/controllers/app_paused.dart

@@ -5,6 +5,7 @@ class AppPausedController extends Notifier<bool> {
   @override
   bool build() {
     final listener = AppLifecycleListener(
+      onHide: () => FocusManager.instance.primaryFocus?.unfocus(),
       onPause: () => state = true,
       onResume: () => state = false,
     );