fix(player): 收紧推荐页互动栏间距

lib/pages/player/widgets/interaction_rail.dart

@@ -7,7 +7,7 @@ import '../../../core/theme/app_colors.dart';
 
 const double _buttonSize = 44;
 const double _iconSize = 32;
-const double _itemGap = 24;
+const double _defaultItemGap = 24;
 
 /// 互动栏单项：图标、计数与点击。
 class InteractionRailItem {
@@ -36,9 +36,14 @@ class InteractionRailItem {
 
 /// 播放页与首页 feed 共用的右侧互动栏：收藏/评论/喜欢/分享。
 class InteractionRail extends StatelessWidget {
-  const InteractionRail({super.key, required this.items});
+  const InteractionRail({
+    super.key,
+    required this.items,
+    this.itemGap = _defaultItemGap,
+  });
 
   final List<InteractionRailItem> items;
+  final double itemGap;
 
   @override
   Widget build(BuildContext context) {
@@ -46,7 +51,7 @@ class InteractionRail extends StatelessWidget {
       mainAxisSize: MainAxisSize.min,
       children: [
         for (var index = 0; index < items.length; index++) ...[
-          if (index > 0) const SizedBox(height: _itemGap),
+          if (index > 0) SizedBox(height: itemGap),
           _RailButton(item: items[index]),
         ],
       ],