feat: Complete Phase 1 Authentication and setup Flutter project structure

- Completed authentication system with signup, login, password reset, and logout
- Enhanced error handling and accessibility across all auth flows
- Added comprehensive loading states and user feedback
- Implemented confirmation dialogs for destructive actions
- Setup complete Flutter project structure with proper configuration
- Added planning documentation for Phase 2 household creation
- All Phase 1 success criteria verified and complete

lib/features/authentication/presentation/pages/splash_page.dart

@@ -1,5 +1,4 @@
 import 'package:flutter/material.dart';
-import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:supabase_flutter/supabase_flutter.dart';
 import 'package:go_router/go_router.dart';
 
@@ -7,14 +6,14 @@ import 'package:go_router/go_router.dart';
 /// 
 /// Shows loading indicator while checking authentication state
 /// and redirects to appropriate screen based on auth status
-class SplashPage extends ConsumerStatefulWidget {
+class SplashPage extends StatefulWidget {
   const SplashPage({super.key});
 
   @override
-  ConsumerState<SplashPage> createState() => _SplashPageState();
+  State<SplashPage> createState() => _SplashPageState();
 }
 
-class _SplashPageState extends ConsumerState<SplashPage> {
+class _SplashPageState extends State<SplashPage> {
   @override
   void initState() {
     super.initState();
@@ -49,10 +48,10 @@ class _SplashPageState extends ConsumerState<SplashPage> {
       
       if (!mounted) return;
       
-// On error, navigate to login for safety
-        if (mounted) {
-          context.go('/login');
-        }
+      // On error, navigate to login for safety
+      if (mounted) {
+        context.go('/login');
+      }
     }
   }