feat: simplify AdminScreen and refactor ImportScreen to use TabBarView directly

flutter/lib/features/import/presentation/import_screen.dart

@@ -14,42 +14,14 @@ class ImportScreen extends StatefulWidget {
   State<ImportScreen> createState() => _ImportScreenState();
 }
 
-class _ImportScreenState extends State<ImportScreen>
-    with SingleTickerProviderStateMixin {
-  late final TabController _tabController;
-
-  @override
-  void initState() {
-    super.initState();
-    _tabController = TabController(length: 2, vsync: this);
-  }
-
-  @override
-  void dispose() {
-    _tabController.dispose();
-    super.dispose();
-  }
-
+class _ImportScreenState extends State<ImportScreen> {
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
-      appBar: AppBar(
-        title: const Text('Importera'),
-        bottom: TabBar(
-          controller: _tabController,
-          tabs: const [
-            Tab(icon: Icon(Icons.restaurant_menu_outlined), text: 'Recept'),
-            Tab(icon: Icon(Icons.receipt_long_outlined), text: 'Kvitto'),
-          ],
-        ),
-      ),
-      body: TabBarView(
-        controller: _tabController,
-        children: const [
-          RecipeImportTab(),
-          ReceiptImportTab(),
-        ],
-      ),
+    return const TabBarView(
+      children: [
+        RecipeImportTab(),
+        ReceiptImportTab(),
+      ],
     );
   }
 }