feat: simplify AdminScreen and refactor ImportScreen to use TabBarView directly

flutter/lib/core/ui/app_shell.dart

@@ -5,7 +5,14 @@ import 'package:go_router/go_router.dart';
 import '../../features/auth/data/auth_providers.dart';
 import '../../features/recipes/data/recipes_grid_provider.dart';
 
-const _adminDestination = _AppDestination(
+const _profileHeaderDestination = _AppDestination(
+  path: '/profile',
+  title: 'Profil',
+  icon: Icons.person,
+  label: 'Profil',
+);
+
+const _adminHeaderDestination = _AppDestination(
   path: '/admin',
   title: 'Admin',
   icon: Icons.admin_panel_settings_outlined,
@@ -53,24 +60,32 @@ class AppShell extends ConsumerWidget {
       icon: Icons.upload_file_outlined,
       label: 'Importera',
     ),
-    _AppDestination(
-      path: '/profile',
-      title: 'Profil',
-      icon: Icons.person,
-      label: 'Profil',
-    ),
   ];
 
-  List<_AppDestination> _destinations(bool isAdmin) => [
-        ..._baseDestinations,
-        if (isAdmin) _adminDestination,
-      ];
+  List<_AppDestination> _destinations(bool isAdmin) => _baseDestinations;
 
-  int _selectedIndex(List<_AppDestination> destinations) {
+  int? _selectedIndex(List<_AppDestination> destinations) {
     final index = destinations.indexWhere(
       (destination) => location.startsWith(destination.path),
     );
-    return index < 0 ? 0 : index;
+    return index < 0 ? null : index;
+  }
+
+  _AppDestination _selectedHeaderDestination(
+    List<_AppDestination> destinations,
+    bool isAdmin,
+  ) {
+    if (location.startsWith('/profile')) {
+      return _profileHeaderDestination;
+    }
+    if (location.startsWith('/admin') && isAdmin) {
+      return _adminHeaderDestination;
+    }
+    final selectedIndex = _selectedIndex(destinations);
+    if (selectedIndex != null) {
+      return destinations[selectedIndex];
+    }
+    return destinations.first;
   }
 
   @override
@@ -78,7 +93,7 @@ class AppShell extends ConsumerWidget {
     final isAdmin = ref.watch(isAdminProvider);
     final dests = _destinations(isAdmin);
     final selectedIndex = _selectedIndex(dests);
-    final selectedDestination = dests[selectedIndex];
+    final selectedDestination = _selectedHeaderDestination(dests, isAdmin);
     final isWide = MediaQuery.of(context).size.width >= 900;
 
     void navigateTo(int index) {
@@ -90,6 +105,7 @@ class AppShell extends ConsumerWidget {
 
     final isRecipesRoute = location.startsWith('/recipes') &&
         !location.startsWith('/recipes/');
+    final isImportRoute = location == '/import';
 
     Future<void> logout() async {
       await ref.read(authStateProvider.notifier).logout();
@@ -98,9 +114,23 @@ class AppShell extends ConsumerWidget {
       }
     }
 
-    return Scaffold(
+    Widget shell = Scaffold(
       appBar: AppBar(
         title: Text(selectedDestination.title),
+        bottom: isImportRoute
+            ? const TabBar(
+                tabs: [
+                  Tab(
+                    icon: Icon(Icons.restaurant_menu_outlined),
+                    text: 'Recept',
+                  ),
+                  Tab(
+                    icon: Icon(Icons.receipt_long_outlined),
+                    text: 'Kvitto',
+                  ),
+                ],
+              )
+            : null,
         actions: [
           if (isRecipesRoute)
             Consumer(
@@ -177,7 +207,7 @@ class AppShell extends ConsumerWidget {
           ? Row(
               children: [
                 NavigationRail(
-                  selectedIndex: selectedIndex,
+                  selectedIndex: selectedIndex ?? 0,
                   onDestinationSelected: navigateTo,
                   labelType: NavigationRailLabelType.all,
                   destinations: dests
@@ -197,7 +227,7 @@ class AppShell extends ConsumerWidget {
       bottomNavigationBar: isWide
           ? null
           : NavigationBar(
-              selectedIndex: selectedIndex,
+              selectedIndex: selectedIndex ?? 0,
               onDestinationSelected: navigateTo,
               destinations: dests
                   .map(
@@ -209,6 +239,12 @@ class AppShell extends ConsumerWidget {
                   .toList(),
             ),
     );
+
+    if (isImportRoute) {
+      shell = DefaultTabController(length: 2, child: shell);
+    }
+
+    return shell;
   }
 }