style(nav): 对齐四 Tab 底栏布局规格

lib/pages/discover/discover_view.dart

@@ -17,7 +17,6 @@ import '../../core/formatting/error_text.dart';
 import '../../core/theme/app_colors.dart';
 import '../../core/theme/app_dimens.dart';
 import '../../core/theme/app_theme.dart';
-import '../../core/widgets/app_bottom_nav.dart';
 import '../../core/widgets/app_pull_to_refresh.dart';
 import '../../core/widgets/app_root_tab.dart';
 import '../../core/widgets/catalog_debug_info.dart';
@@ -160,7 +159,7 @@ class _DiscoverPageState extends State<DiscoverPage> {
               loading: logic.searchLoading,
             ),
             Expanded(child: _feed(l10n, categories)),
-            if (!embedded) _bottomNav(l10n),
+            if (!embedded) _bottomNav(),
           ],
         ),
       ),
@@ -612,20 +611,9 @@ class _DiscoverPageState extends State<DiscoverPage> {
     unawaited(playDramaFromCatalog(context, drama));
   }
 
-  Widget _bottomNav(AppLocalizations l10n) => AppBottomNav(
-    items: [
-      for (final tab in AppRootTab.values)
-        AppBottomNavItem(
-          tabKey: tab.tabKey,
-          icon: tab.icon,
-          selectedIcon: tab.selectedIcon,
-          label: tab.label(l10n),
-          selected: tab == AppRootTab.recommend,
-          onTap: tab == AppRootTab.recommend
-              ? () {}
-              : () => _act(_actionOf(tab)),
-        ),
-    ],
+  Widget _bottomNav() => AppRootBottomNav(
+    selected: AppRootTab.recommend,
+    onSelected: (tab) => _act(_actionOf(tab)),
   );
 
   DiscoverPageAction _actionOf(AppRootTab tab) => switch (tab) {