fix(home): 修复目录错误态被占位层遮挡

lib/pages/home/widgets/home_feed_grid.dart

@@ -104,6 +104,7 @@ class _HomeFeedGridState extends State<HomeFeedGrid> {
                       return _categoryPlaceholder(
                         l10n,
                         context.watch<CategoryController>(),
+                        catalog,
                       );
                     }
                     final category = shortcuts[index];
@@ -146,7 +147,11 @@ class _HomeFeedGridState extends State<HomeFeedGrid> {
   Widget _categoryPlaceholder(
     AppLocalizations l10n,
     CategoryController controller,
+    CatalogController catalog,
   ) {
+    if (catalog.error != null) {
+      return _catalogErrorState(l10n, catalog);
+    }
     if (controller.loading) {
       return const DramaGridSkeleton(
         key: Key('home-grid-skeleton'),