fix(input): reset long press state safely

lib/focus/focusable_chip_mixin.dart

@@ -86,7 +86,12 @@ mixin FocusableChipStateMixin<T extends StatefulWidget> on State<T> {
 
   void _onFocusChange() {
     if (mounted) {
-      setState(() => _isFocused = focusNode.hasFocus);
+      final hasFocus = focusNode.hasFocus;
+      setState(() => _isFocused = hasFocus);
+      if (!hasFocus) {
+        _longPressTimer?.cancel();
+        _isSelectKeyDown = false;
+      }
       // Same convention as FocusableTileStateMixin: a chip inside a
       // scrollable strip (TabChipStrip, filter bars) reveals itself on
       // focus; a no-op when no ancestor scrollable exists.
@@ -114,6 +119,10 @@ mixin FocusableChipStateMixin<T extends StatefulWidget> on State<T> {
     }
 
     if (SelectKeyUpSuppressor.consumeIfSuppressed(event)) {
+      if (event is KeyUpEvent && key.isSelectKey) {
+        _longPressTimer?.cancel();
+        _isSelectKeyDown = false;
+      }
       return KeyEventResult.handled;
     }
 
@@ -125,7 +134,7 @@ mixin FocusableChipStateMixin<T extends StatefulWidget> on State<T> {
             _isSelectKeyDown = true;
             _longPressTimer?.cancel();
             _longPressTimer = Timer(const Duration(milliseconds: 500), () {
-              if (mounted) {
+              if (mounted && _isSelectKeyDown) {
                 SelectKeyUpSuppressor.suppressSelectUntilKeyUp();
                 callbacks.onLongPress?.call();
               }
@@ -150,7 +159,8 @@ mixin FocusableChipStateMixin<T extends StatefulWidget> on State<T> {
 
     // Context menu key triggers long press directly
     if (event.isActionable && key.isContextMenuKey && callbacks.onLongPress != null) {
-      SelectKeyUpSuppressor.suppressSelectUntilKeyUp();
+      _longPressTimer?.cancel();
+      _isSelectKeyDown = false;
       callbacks.onLongPress!();
       return KeyEventResult.handled;
     }

lib/focus/focusable_wrapper.dart

@@ -376,6 +376,10 @@ class _FocusableWrapperState extends State<FocusableWrapper> with SingleTickerPr
     _logFocusableWrapper('node=${node.debugLabel} received key=(${_describeFocusableKey(event)})');
 
     if (SelectKeyUpSuppressor.consumeIfSuppressed(event)) {
+      if (event is KeyUpEvent && key.isSelectKey) {
+        _longPressTimer?.cancel();
+        _isSelectKeyDown = false;
+      }
       return finish(KeyEventResult.handled, 'select-key-up-suppressed');
     }
 
@@ -404,7 +408,7 @@ class _FocusableWrapperState extends State<FocusableWrapper> with SingleTickerPr
             _longPressTimer?.cancel();
             _longPressTimer = Timer(widget.longPressDuration, () {
               // Long press detected
-              if (mounted) {
+              if (mounted && _isSelectKeyDown) {
                 SelectKeyUpSuppressor.suppressSelectUntilKeyUp();
                 widget.onLongPress?.call();
               }
@@ -437,7 +441,8 @@ class _FocusableWrapperState extends State<FocusableWrapper> with SingleTickerPr
 
     // Context menu key
     if (key.isContextMenuKey) {
-      SelectKeyUpSuppressor.suppressSelectUntilKeyUp();
+      _longPressTimer?.cancel();
+      _isSelectKeyDown = false;
       widget.onLongPress?.call();
       return finish(KeyEventResult.handled, 'context-menu');
     }