feat(wip): Update entities and adopt a proper repository workflow for trip "obtention"

frontend/lib/presentation/pages/start.dart

@@ -3,6 +3,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:anyway/presentation/providers/onboarding_state_provider.dart';
 import 'package:anyway/presentation/pages/login.dart';
 import 'package:anyway/presentation/pages/onboarding.dart';
+import 'package:anyway/presentation/pages/new_trip_preferences.dart';
 
 // Example providers (replace these with your actual providers)
 // final onboardingStateProvider = Provider<bool>((ref) => true); // Replace with actual onboarding state logic
@@ -80,7 +81,16 @@ class TripCreationPage extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      body: Center(child: Text('Trip Creation Page')),
+      appBar: AppBar(title: const Text('Create a Trip')),
+      body: Center(
+        child: ElevatedButton.icon(
+          icon: const Icon(Icons.tune),
+          label: const Text('Set Preferences'),
+          onPressed: () {
+            Navigator.of(context).push(MaterialPageRoute(builder: (_) => const NewTripPreferencesPage()));
+          },
+        ),
+      ),
     );
   }
 }