style: 增加推荐剧单渐变背景

lib/pages/recommend/recommend_page.dart

@@ -68,14 +68,7 @@ class _RecommendPageState extends State<RecommendPage> {
                   ),
                   _KeepAliveTab(
                     key: const PageStorageKey('recommend-tab-playlists'),
-                    child: _withTopNavSpace(
-                      RecommendSectionsView(
-                        feedController: widget.feedController,
-                        categories: categories,
-                        onOpenDrama: _openDrama,
-                        onMore: _handleMore,
-                      ),
-                    ),
+                    child: _recommendPlaylists(categories),
                   ),
                   _KeepAliveTab(
                     key: const PageStorageKey('recommend-tab-all'),
@@ -173,6 +166,50 @@ class _RecommendPageState extends State<RecommendPage> {
     );
   }
 
+  Widget _recommendPlaylists(CategoryController categories) {
+    return DecoratedBox(
+      key: const Key('recommend-playlist-surface'),
+      decoration: const BoxDecoration(
+        gradient: LinearGradient(
+          begin: Alignment.topCenter,
+          end: Alignment.bottomCenter,
+          colors: [
+            AppColors.mineGradientTop,
+            AppColors.mineGradientMiddle,
+            AppColors.mineGradientBottom,
+          ],
+          stops: [0, 0.4, 0.75],
+        ),
+      ),
+      child: Stack(
+        fit: StackFit.expand,
+        children: [
+          const DecoratedBox(
+            key: Key('recommend-playlist-glow'),
+            decoration: BoxDecoration(
+              gradient: RadialGradient(
+                center: Alignment(0, -0.95),
+                radius: 0.9,
+                colors: [
+                  AppColors.recommendPlaylistGlow,
+                  AppColors.transparent,
+                ],
+              ),
+            ),
+          ),
+          _withTopNavSpace(
+            RecommendSectionsView(
+              feedController: widget.feedController,
+              categories: categories,
+              onOpenDrama: _openDrama,
+              onMore: _handleMore,
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+
   void _selectTab(RecommendInnerTab tab) {
     setState(() {
       _tab = tab;