Remove toast on history item restore

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/main.dart

@@ -503,7 +503,6 @@ class _InputSyncPageState extends State<InputSyncPage>
     inputController.text = text;
     inputController.selection = TextSelection.collapsed(offset: text.length);
     Navigator.of(context).pop();
-    _showToast('已从历史记录恢复');
     inputFocusNode.requestFocus();
   }