style(theme): 客户端切换深色视觉风格

lib/pages/player/player_view_actions.dart

@@ -6,7 +6,7 @@ extension _PlayerViewActions on _PlayerPageState {
   Future<void> _openSpeedSheet(BuildContext context) async {
     final selected = await showModalBottomSheet<double>(
       context: context,
-      backgroundColor: Colors.transparent,
+      backgroundColor: AppColors.transparent,
       showDragHandle: false,
       builder: (_) => PlayerSpeedSheet(selected: _playbackSpeed),
     );
@@ -19,7 +19,7 @@ extension _PlayerViewActions on _PlayerPageState {
     final l10n = AppLocalizations.of(context)!;
     await showModalBottomSheet<void>(
       context: context,
-      backgroundColor: Colors.transparent,
+      backgroundColor: AppColors.transparent,
       showDragHandle: false,
       isScrollControlled: true,
       builder: (_) => PlayerMoreSheet(
@@ -52,7 +52,7 @@ extension _PlayerViewActions on _PlayerPageState {
     if (wallet == null) return;
     await showModalBottomSheet<bool>(
       context: context,
-      backgroundColor: Colors.transparent,
+      backgroundColor: AppColors.transparent,
       showDragHandle: false,
       isScrollControlled: true,
       builder: (_) => PlayerUnlockSheet(