feat: 修复了插件需要外部Provider的问题；加上了一个简易的车控状态返回

lib/widgets/floating_icon.dart

@@ -96,9 +96,14 @@ class _FloatingIconState extends State<FloatingIcon> with TickerProviderStateMix
   // 显示全屏界面
   void _showFullScreen() async {
     _hidePartScreen();
+    final messageService = context.read<MessageService>();
+
     await Navigator.of(context).push(
       MaterialPageRoute(
-        builder: (context) => const FullScreen(),
+        builder: (context) => ChangeNotifierProvider.value(
+          value: messageService, // 传递同一个单例实例
+          child: const FullScreen(),
+        ),
       ),
     );
   }
@@ -164,7 +169,11 @@ class _FloatingIconState extends State<FloatingIcon> with TickerProviderStateMix
     //     }
     //   }
     // });
-    
+
+    return ChangeNotifierProvider(create: (_) => MessageService(), child: _buildFloatingIcon());
+  }
+
+  Widget _buildFloatingIcon() {
     return Stack(
       children: [
         if (_isShowPartScreen)