style(theme): 客户端切换深色视觉风格

lib/pages/player/widgets/interaction_rail.dart

@@ -71,7 +71,7 @@ class _RailButton extends StatelessWidget {
               width: _iconSize,
               height: _iconSize,
               fit: BoxFit.contain,
-              color: item.selected ? AppColors.blue : Colors.white,
+              color: item.selected ? AppColors.blue : AppColors.onPrimary,
               colorBlendMode: BlendMode.srcIn,
             ),
           ),
@@ -83,11 +83,11 @@ class _RailButton extends StatelessWidget {
           maxLines: 1,
           overflow: TextOverflow.ellipsis,
           style: const TextStyle(
-            color: Colors.white,
+            color: AppColors.onPrimary,
             height: 1,
             fontSize: 12,
             fontWeight: FontWeight.w600,
-            shadows: [Shadow(blurRadius: 6, color: Colors.black)],
+            shadows: [Shadow(blurRadius: 6, color: AppColors.mediaBlack)],
           ),
         ),
       ],