audioPlay指令播放失败，toast提示

lib/data/repositories/message/audio_player_handler.dart

@@ -2,6 +2,8 @@ import 'package:appframe/bloc/web_cubit.dart';
 import 'package:appframe/config/locator.dart';
 import 'package:appframe/services/dispatcher.dart';
 import 'package:appframe/services/player_service.dart';
+import 'package:flutter/material.dart';
+import 'package:fluttertoast/fluttertoast.dart';
 import 'package:uuid/uuid.dart';
 
 class AudioPlayHandler extends MessageHandler {
@@ -29,9 +31,17 @@ class AudioPlayHandler extends MessageHandler {
       }
 
       var playerService = getIt.get<PlayerService>();
-      var result = await playerService.playAudio(url, seek, playId, playRate);
+      var result = false;
+      try {
+        result = await playerService.playAudio(url, seek, playId, playRate);
+      } catch (e) {
+        // 播放异常（下载失败/音频损坏/播放器重建失败等）：提示用户后继续上抛，保持 H5 的错误回调语义
+        _showPlayFailedToast();
+        rethrow;
+      }
 
       if (!result) {
+        _showPlayFailedToast();
         throw Exception('播放错误');
       }
       return {'playId': playId};
@@ -45,6 +55,11 @@ class AudioPlayHandler extends MessageHandler {
     this._webCubit = cubit;
   }
 
+  /// 播放失败统一提示
+  void _showPlayFailedToast() {
+    Fluttertoast.showToast(msg: '无法播放该音频', gravity: ToastGravity.CENTER, backgroundColor: Colors.grey);
+  }
+
   void _unfollowCubit() {
     this._webCubit = null;
   }