feat(01-11): integrate router into main app with error handling

- Updated main.dart to use ProviderScope and MaterialApp.router
- Integrated AppRouter with proper GoRouter configuration
- Added comprehensive error handling with ErrorBoundary widget
- Updated HomePage to use auth provider for logout functionality
- Fixed SplashPage to use GoRouter navigation
- Implemented router provider for Riverpod integration
- Added proper resource disposal and restart functionality

Files modified:
- lib/main.dart (complete app structure)
- lib/core/router/app_router.dart (router integration)
- lib/features/authentication/presentation/pages/splash_page.dart (navigation fix)
- lib/features/home/presentation/pages/home_page.dart (logout implementation)

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

@@ -1,6 +1,7 @@
 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';
 
 /// Splash page for initial loading and authentication state checking
 /// 
@@ -33,18 +34,14 @@ class _SplashPageState extends ConsumerState<SplashPage> {
       
       if (currentUser != null) {
         // User is authenticated, navigate to home
-        // TODO: Use GoRouter when integrated
-        // Navigator.of(context).pushReplacementNamed('/home');
-        
-        // For now, we'll use a simple navigation
-        Navigator.of(context).pushReplacementNamed('/home');
+        if (mounted) {
+          context.go('/home');
+        }
       } else {
         // User is not authenticated, navigate to login
-        // TODO: Use GoRouter when integrated
-        // Navigator.of(context).pushReplacementNamed('/login');
-        
-        // For now, we'll use a simple navigation
-        Navigator.of(context).pushReplacementNamed('/login');
+        if (mounted) {
+          context.go('/login');
+        }
       }
     } catch (e) {
       // Handle authentication state check errors
@@ -52,8 +49,10 @@ class _SplashPageState extends ConsumerState<SplashPage> {
       
       if (!mounted) return;
       
-      // On error, navigate to login for safety
-      Navigator.of(context).pushReplacementNamed('/login');
+// On error, navigate to login for safety
+        if (mounted) {
+          context.go('/login');
+        }
     }
   }