chore(wip): upgrade dependencies, begin refactor

frontend/lib/presentation/providers/onboarding_state_provider.dart

@@ -0,0 +1,24 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+final onboardingStateProvider = FutureProvider<bool>((ref) async {
+  final prefs = await SharedPreferences.getInstance();
+  return prefs.getBool('onboardingCompleted') ?? false;
+});
+
+
+final onboardingControllerProvider = Provider<OnboardingController>((ref) {
+  return OnboardingController(ref);
+});
+
+class OnboardingController {
+  final Ref ref;
+  OnboardingController(this.ref);
+
+  Future<void> setOnboarded(bool value) async {
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setBool('onboardingCompleted', value);
+    // refresh the read provider so UI updates
+    ref.invalidate(onboardingStateProvider);
+  }
+}

frontend/lib/presentation/providers/trip_provider.dart

@@ -0,0 +1,6 @@
+// import 'package:anyway/data/repositories/trip_repository.dart';
+// import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+// final weatherRepositoryProvider = Provider<TripRepository>((ref) {
+//   return TripRepositoryImpl(???);
+// });