chore(wip): upgrade dependencies, begin refactor

frontend/lib/presentation/pages/start.dart

@@ -0,0 +1,97 @@
+import 'package:flutter/material.dart';
+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';
+
+// Example providers (replace these with your actual providers)
+// final onboardingStateProvider = Provider<bool>((ref) => true); // Replace with actual onboarding state logic
+final authStateProvider = FutureProvider<bool>((ref) async => true); // Replace with actual auth state logic
+final tripsAvailableProvider = FutureProvider<bool>((ref) async => false); // Replace with actual trips availability logic
+
+class StartPage extends ConsumerWidget {
+  const StartPage({Key? key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+
+      // the home page is dependent on the state of the providers:
+      // - if the user is not onboarded, show the onboarding flow
+      // - if the user is not logged in, show the login page
+      // - if there are no trips available, show the trip creation page
+      // - else: show the overview page that shows the last trip
+
+      final onboardingState = ref.watch(onboardingStateProvider);
+      final authState = ref.watch(authStateProvider);
+      final tripsAvailable = ref.watch(tripsAvailableProvider);
+
+      return onboardingState.when(
+        data: (isOnboarded) {
+          if (!isOnboarded) {
+            return const OnboardingPage();
+          }
+
+          return authState.when(
+            data: (isLoggedIn) {
+              if (!isLoggedIn) {
+                return const LoginPage();
+              }
+
+              return tripsAvailable.when(
+                data: (hasTrips) {
+                  if (!hasTrips) {
+                    return const TripCreationPage();
+                  }
+                  return const OverviewPage();
+                },
+                loading: () => const Scaffold(
+                  body: Center(child: CircularProgressIndicator()),
+                ),
+                error: (error, stack) => Scaffold(
+                  body: Center(child: Text('Error: $error')),
+                ),
+              );
+            },
+            loading: () => const Scaffold(
+              body: Center(child: CircularProgressIndicator()),
+            ),
+            error: (error, stack) => Scaffold(
+              body: Center(child: Text('Error: $error')),
+            ),
+          );
+        },
+        loading: () => const Scaffold(
+          body: Center(child: CircularProgressIndicator()),
+        ),
+        error: (error, stack) => Scaffold(
+          body: Center(child: Text('Error: $error')
+        ),
+      ),
+    );
+  }
+}
+
+
+
+
+class TripCreationPage extends StatelessWidget {
+  const TripCreationPage({Key? key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Center(child: Text('Trip Creation Page')),
+    );
+  }
+}
+
+class OverviewPage extends StatelessWidget {
+  const OverviewPage({Key? key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Center(child: Text('Overview Page')),
+    );
+  }
+}