style(theme): 客户端切换深色视觉风格

lib/pages/player/widgets/scrub_preview_card.dart

@@ -164,7 +164,7 @@ class _ScrubPreviewCardState extends State<ScrubPreviewCard> {
       decoration: BoxDecoration(
         color: AppColors.card,
         borderRadius: BorderRadius.circular(8),
-        border: Border.all(color: Colors.white, width: 1),
+        border: Border.all(color: AppColors.onPrimary, width: 1),
       ),
       child: ClipRRect(
         borderRadius: BorderRadius.circular(7),
@@ -174,7 +174,7 @@ class _ScrubPreviewCardState extends State<ScrubPreviewCard> {
             Container(
               width: double.infinity,
               padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 4),
-              color: Colors.black87,
+              color: AppColors.scrubPreviewScrim,
               child: Text(
                 '${_format(widget.position)} / ${_format(widget.duration)}',
                 key: const Key('scrub-preview-time'),
@@ -182,7 +182,7 @@ class _ScrubPreviewCardState extends State<ScrubPreviewCard> {
                 maxLines: 1,
                 overflow: TextOverflow.ellipsis,
                 style: const TextStyle(
-                  color: Colors.white,
+                  color: AppColors.onPrimary,
                   fontSize: 11,
                   fontWeight: FontWeight.w600,
                   height: 1.2,