refactor: fix warnings

lib/focus/input_mode_tracker.dart

@@ -56,7 +56,6 @@ class _InputModeTrackerState extends State<InputModeTracker> {
     _updateFocusHighlightStrategy(_mode);
     // Listen to hardware keyboard events globally
     HardwareKeyboard.instance.addHandler(_handleKeyEvent);
-    RawKeyboard.instance.addListener(_handleRawKeyEvent);
 
     // Register callback for gamepad input to switch to keyboard mode
     GamepadService.onGamepadInput = () => _setMode(InputMode.keyboard);
@@ -65,7 +64,6 @@ class _InputModeTrackerState extends State<InputModeTracker> {
   @override
   void dispose() {
     HardwareKeyboard.instance.removeHandler(_handleKeyEvent);
-    RawKeyboard.instance.removeListener(_handleRawKeyEvent);
     GamepadService.onGamepadInput = null;
     super.dispose();
   }
@@ -79,12 +77,6 @@ class _InputModeTrackerState extends State<InputModeTracker> {
     return false;
   }
 
-  void _handleRawKeyEvent(RawKeyEvent event) {
-    if (event is RawKeyDownEvent) {
-      _setMode(InputMode.keyboard);
-    }
-  }
-
   void _setMode(InputMode mode) {
     if (_mode != mode) {
       setState(() => _mode = mode);