fix(recommend): 精简底部信息并优化进度拖动

lib/pages/recommend/recommend_page.dart

@@ -28,12 +28,14 @@ class RecommendPage extends StatefulWidget {
     required this.active,
     required this.onSearch,
     required this.onOpenFilter,
+    required this.onScrubVisibilityChanged,
   });
 
   final HomeFeedController feedController;
   final bool active;
   final VoidCallback onSearch;
   final VoidCallback onOpenFilter;
+  final ValueChanged<bool> onScrubVisibilityChanged;
 
   @override
   State<RecommendPage> createState() => _RecommendPageState();
@@ -41,6 +43,7 @@ class RecommendPage extends StatefulWidget {
 
 class _RecommendPageState extends State<RecommendPage> {
   RecommendInnerTab _tab = RecommendInnerTab.feed;
+  bool _scrubbing = false;
 
   @override
   Widget build(BuildContext context) {
@@ -77,20 +80,21 @@ class _RecommendPageState extends State<RecommendPage> {
               ),
             ),
           ),
-          Positioned(
-            top: 0,
-            left: 0,
-            right: 0,
-            child: SafeArea(
-              bottom: false,
-              child: RecommendTopNav(
-                selected: _tab,
-                onVideo: _tab == RecommendInnerTab.feed,
-                onSelected: (tab) => setState(() => _tab = tab),
-                onSearch: widget.onSearch,
+          if (!_scrubbing)
+            Positioned(
+              top: 0,
+              left: 0,
+              right: 0,
+              child: SafeArea(
+                bottom: false,
+                child: RecommendTopNav(
+                  selected: _tab,
+                  onVideo: _tab == RecommendInnerTab.feed,
+                  onSelected: (tab) => setState(() => _tab = tab),
+                  onSearch: widget.onSearch,
+                ),
               ),
             ),
-          ),
         ],
       ),
     );
@@ -136,9 +140,16 @@ class _RecommendPageState extends State<RecommendPage> {
           _openDrama(drama, episodeId: episode.id),
       onRefreshFeed: widget.feedController.refreshCurrent,
       onLoadMore: widget.feedController.loadMore,
+      onScrubVisibilityChanged: _setScrubbing,
     );
   }
 
+  void _setScrubbing(bool value) {
+    if (_scrubbing == value) return;
+    setState(() => _scrubbing = value);
+    widget.onScrubVisibilityChanged(value);
+  }
+
   Widget _withTopNavSpace(Widget child) {
     return SafeArea(
       bottom: false,