远程遥控视频的显示bug修复；恢复远程遥控中的前置推送检查和动态实时信息的展示。

lib/features/remote_control/presentation/widgets/center_control_area.dart

@@ -2,6 +2,7 @@ import 'package:cc_ui_kit/cc_ui_kit.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:maibu_satabot_v2/components/capsule_toast.dart';
 import 'package:maibu_satabot_v2/core/localization/app_localizations.dart';
 
 import '../bloc/remote_control_cubit.dart';
@@ -115,6 +116,13 @@ class CenterControlArea extends StatelessWidget {
   void _handleSliderAction(String deviceKey, String action, BuildContext context) {
     debugPrint('🎯 [Slider 业务] deviceKey: $deviceKey, action: $action');
 
+    // 🔥 门槛检查：与摇杆一致，未收到 TCP 0x02 推送时禁止操作并提示。
+    //    胶囊 Toast 全局去重、自动消失，适配 StatelessWidget 无实例状态。
+    if (!context.read<RemoteControlCubit>().isStatusPushActive()) {
+      CapsuleToast.show('暂未收到该机器的推送，不能控制', showCheck: false);
+      return;
+    }
+
     // 🔥 使用deviceKey进行判断，不依赖显示文本
     switch (deviceKey) {
       case 'chassis':

lib/features/remote_control/presentation/widgets/webrtc/webrtc_local_player.dart

@@ -71,6 +71,11 @@ class _WebRTCLocalPlayerState extends State<WebRTCLocalPlayer> {
   void _updateLoadState(WebRTCLoadState state) {
     if (_loadState == state) return;
     _loadState = state;
+    // 🔥 自身状态变化必须触发重建：未传 onLoadingStateChanged 的调用方
+    // （如远程遥控页）否则无法从"视频加载中"切到 playing/error 界面
+    if (mounted) {
+      setState(() {});
+    }
     widget.onLoadingStateChanged?.call(state);
   }
 
@@ -404,19 +409,34 @@ class _WebRTCLocalPlayerState extends State<WebRTCLocalPlayer> {
     // 🔥 在真正渲染出视频帧（playing 态）之前，始终显示加载指示器
     // 避免出现"track 已收到但画面是黑的"黑屏情况
     if (_loadState != WebRTCLoadState.playing) {
+      // 🔥 区分 loading 与 error：error 态显示明确失败提示，不再一直转圈
+      final bool isError = _loadState == WebRTCLoadState.error;
       return Container(
         color: Colors.black,
         child: Center(
           child: Column(
             mainAxisAlignment: MainAxisAlignment.center,
-            children: [
-              const CircularProgressIndicator(color: Colors.white),
-              const SizedBox(height: 12),
-              Text(
-                '视频加载中...',
-                style: TextStyle(color: Colors.white70, fontSize: 14),
-              ),
-            ],
+            children: isError
+                ? [
+                    const Icon(
+                      Icons.videocam_off,
+                      size: 48,
+                      color: Colors.white38,
+                    ),
+                    const SizedBox(height: 12),
+                    const Text(
+                      '视频加载失败，请检查设备是否在线或重试',
+                      style: TextStyle(color: Colors.white70, fontSize: 14),
+                    ),
+                  ]
+                : [
+                    const CircularProgressIndicator(color: Colors.white),
+                    const SizedBox(height: 12),
+                    const Text(
+                      '视频加载中...',
+                      style: TextStyle(color: Colors.white70, fontSize: 14),
+                    ),
+                  ],
           ),
         ),
       );