feat(app): 完善播放协议搜索与空状态

lib/pages/home/widgets/home_feed_grid.dart

@@ -207,7 +207,7 @@ class _HomeFeedGridState extends State<HomeFeedGrid> {
                 if (dramas.isEmpty)
                   SliverFillRemaining(
                     hasScrollBody: false,
-                    child: _emptyState(l10n, tab, tag),
+                    child: _emptyState(l10n),
                   )
                 else
                   SliverPadding(
@@ -360,7 +360,7 @@ class _HomeFeedGridState extends State<HomeFeedGrid> {
     }
   }
 
-  Widget _emptyState(AppLocalizations l10n, HomePrimaryTab tab, String? tag) {
+  Widget _emptyState(AppLocalizations l10n) {
     if (widget.feedController.lastError != null) {
       return EmptyState(
         key: const Key('home-grid-error'),
@@ -370,19 +370,10 @@ class _HomeFeedGridState extends State<HomeFeedGrid> {
         onAction: () => unawaited(widget.feedController.refreshCurrent()),
       );
     }
-    final filtered =
-        tab == HomePrimaryTab.costume ||
-        tab == HomePrimaryTab.community ||
-        tag != null;
     return EmptyState(
       key: const Key('home-grid-empty'),
       icon: Icons.movie_filter_outlined,
-      title: filtered ? l10n.homeGridFilterEmpty : l10n.noStories,
-      subtitle: filtered ? null : l10n.emptyHint,
-      actionLabel: filtered ? l10n.homeGridClearFilter : null,
-      onAction: filtered
-          ? () => setState(() => _selectedTags[tab] = null)
-          : null,
+      title: l10n.emptyContent,
     );
   }
 }