style(theme): 客户端切换深色视觉风格

lib/pages/player/widgets/player_video_surface.dart

@@ -4,6 +4,8 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:video_player/video_player.dart';
 
+import '../../../core/theme/app_colors.dart';
+
 const Duration _videoFadeDuration = Duration(milliseconds: 200);
 const double _errorHorizontal = 32;
 const int _errorMaxLines = 3;
@@ -55,7 +57,7 @@ class _PlayerVideoSurfaceState extends State<PlayerVideoSurface> {
       children: [
         const ColoredBox(
           key: Key('player-fallback-background'),
-          color: Colors.black,
+          color: AppColors.mediaBlack,
         ),
         AnimatedOpacity(
           key: const Key('player-video-opacity'),
@@ -81,7 +83,7 @@ class _PlayerVideoSurfaceState extends State<PlayerVideoSurface> {
                 maxLines: _errorMaxLines,
                 overflow: TextOverflow.ellipsis,
                 textAlign: TextAlign.center,
-                style: const TextStyle(color: Colors.white70, fontSize: 13),
+                style: const TextStyle(color: AppColors.muted, fontSize: 13),
               ),
             ),
           ),