feat: implement API client with JSON handling and error mapping; enhance routing and state management in app shell

flutter/lib/features/profile/presentation/profile_screen.dart

@@ -1,37 +1,12 @@
 import 'package:flutter/material.dart';
-import 'package:flutter_riverpod/flutter_riverpod.dart';
-import 'package:go_router/go_router.dart';
-import '../../auth/data/auth_providers.dart';
 
-class ProfileScreen extends ConsumerWidget {
+class ProfileScreen extends StatelessWidget {
   const ProfileScreen({super.key});
 
-  Future<void> _logout(BuildContext context, WidgetRef ref) async {
-    await ref.read(authStateProvider.notifier).logout();
-    if (context.mounted) context.go('/login');
-  }
-
   @override
-  Widget build(BuildContext context, WidgetRef ref) {
-    return Scaffold(
-      appBar: AppBar(
-        title: const Text('Profil'),
-        actions: [
-          IconButton(
-            tooltip: 'Recept',
-            icon: const Icon(Icons.restaurant_menu),
-            onPressed: () => context.go('/recipes'),
-          ),
-          IconButton(
-            tooltip: 'Logga ut',
-            icon: const Icon(Icons.logout),
-            onPressed: () => _logout(context, ref),
-          ),
-        ],
-      ),
-      body: const Center(
-        child: Text('Profilsida (grundversion)'),
-      ),
+  Widget build(BuildContext context) {
+    return const Center(
+      child: Text('Profilsida (grundversion)'),
     );
   }
 }