feat(flutter): 应用浅色暖橙视觉主题

lib/pages/player/widgets/player_center_toggle.dart

@@ -4,7 +4,7 @@ import 'package:flutter/material.dart';
 
 import '../../../core/theme/app_colors.dart';
 
-/// Shared play/pause control used by the home feed and full-screen player.
+/// 首页沉浸流与全屏播放器共用的播放/暂停按钮。
 class PlayerCenterToggle extends StatelessWidget {
   const PlayerCenterToggle({
     super.key,
@@ -26,7 +26,7 @@ class PlayerCenterToggle extends StatelessWidget {
           width: 52,
           height: 52,
           decoration: const BoxDecoration(
-            color: Color(0x80000000),
+            color: AppColors.blue,
             shape: BoxShape.circle,
           ),
           child: Icon(