⚡ Optimize nav transition performance

lib/main.dart

@@ -13,6 +13,7 @@ import 'package:surface/providers/theme.dart';
 import 'package:surface/providers/userinfo.dart';
 import 'package:surface/providers/websocket.dart';
 import 'package:surface/router.dart';
+import 'package:surface/widgets/navigation/app_scaffold.dart';
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
@@ -83,6 +84,9 @@ class AppMainContent extends StatelessWidget {
         ...context.localizationDelegates,
       ],
       routerConfig: appRouter,
+      builder: (context, child) {
+        return AppRootScaffold(body: child ?? const SizedBox.shrink());
+      },
     );
   }
 }

lib/router.dart

@@ -27,27 +27,37 @@ final _appRoutes = [
       GoRoute(
         path: '/',
         name: 'home',
-        builder: (context, state) => const HomeScreen(),
+        pageBuilder: (context, state) => NoTransitionPage(
+          child: const HomeScreen(),
+        ),
       ),
       GoRoute(
         path: '/posts',
         name: 'explore',
-        builder: (context, state) => const ExploreScreen(),
+        pageBuilder: (context, state) => NoTransitionPage(
+          child: const ExploreScreen(),
+        ),
       ),
       GoRoute(
         path: '/account',
         name: 'account',
-        builder: (context, state) => const AccountScreen(),
+        pageBuilder: (context, state) => NoTransitionPage(
+          child: const AccountScreen(),
+        ),
       ),
       GoRoute(
         path: '/chat',
         name: 'chat',
-        builder: (context, state) => const ChatScreen(),
+        pageBuilder: (context, state) => NoTransitionPage(
+          child: const ChatScreen(),
+        ),
       ),
       GoRoute(
         path: '/album',
         name: 'album',
-        builder: (context, state) => const AlbumScreen(),
+        pageBuilder: (context, state) => NoTransitionPage(
+          child: const AlbumScreen(),
+        ),
       ),
     ],
   ),
@@ -130,10 +140,5 @@ final _appRoutes = [
 ];
 
 final appRouter = GoRouter(
-  routes: [
-    ShellRoute(
-      builder: (context, state, child) => AppRootScaffold(body: child),
-      routes: _appRoutes,
-    ),
-  ],
+  routes: _appRoutes,
 );

lib/widgets/connection_indicator.dart

@@ -42,7 +42,7 @@ class ConnectionIndicator extends StatelessWidget {
         )
             .height(
                 (ws.isBusy || !ws.isConnected) && ua.isAuthorized
-                    ? MediaQuery.of(context).padding.top + 30
+                    ? MediaQuery.of(context).padding.top + 36
                     : 0,
                 animate: true)
             .animate(