feat(flutter): 应用浅色暖橙视觉主题

lib/pages/discover/discover_view.dart

@@ -108,9 +108,9 @@ class _DiscoverPageState extends State<DiscoverPage> {
       ),
     );
     return AnnotatedRegion<SystemUiOverlayStyle>(
-      value: SystemUiOverlayStyle.light,
+      value: SystemUiOverlayStyle.dark,
       child: Theme(
-        data: AppTheme.dark(),
+        data: AppTheme.light(),
         child: embedded
             ? content
             : Scaffold(backgroundColor: AppColors.ink, body: content),
@@ -340,6 +340,10 @@ class _DiscoverPageState extends State<DiscoverPage> {
   }
 
   Widget _bottomNav(AppLocalizations l10n) => AppBottomNav(
+    centerAction: AppBottomNavCenterAction(
+      label: l10n.createTab,
+      onTap: () => _act(DiscoverPageAction.create),
+    ),
     items: [
       AppBottomNavItem(
         tabKey: const Key('discover-nav-home'),