update

lib/app/router.dart

@@ -3,6 +3,8 @@ import 'package:go_router/go_router.dart';
 import '../features/dashboard/screen.dart';
 import '../features/add_transaction/screen.dart';
 import '../features/categories/screen.dart';
+import '../features/settings/screen.dart';
+import '../shared/models/transaction.dart';
 
 final _shellKey = GlobalKey<NavigatorState>();
 
@@ -25,11 +27,20 @@ final appRouter = GoRouter(
             child: CategoriesScreen(),
           ),
         ),
+        GoRoute(
+          path: '/settings',
+          pageBuilder: (context, state) => const NoTransitionPage(
+            child: SettingsScreen(),
+          ),
+        ),
       ],
     ),
     GoRoute(
       path: '/add',
-      builder: (context, state) => const AddTransactionScreen(),
+      builder: (context, state) {
+        final transaction = state.extra as Transaction?;
+        return AddTransactionScreen(initial: transaction);
+      },
     ),
   ],
 );
@@ -41,6 +52,7 @@ class AppShell extends StatelessWidget {
   int _locationToIndex(BuildContext context) {
     final location = GoRouterState.of(context).uri.toString();
     if (location.startsWith('/categories')) return 1;
+    if (location.startsWith('/settings')) return 2;
     return 0;
   }
 
@@ -60,6 +72,7 @@ class AppShell extends StatelessWidget {
         onDestinationSelected: (i) {
           if (i == 0) context.go('/dashboard');
           if (i == 1) context.go('/categories');
+          if (i == 2) context.go('/settings');
         },
         destinations: const [
           NavigationDestination(
@@ -72,6 +85,11 @@ class AppShell extends StatelessWidget {
             selectedIcon: Icon(Icons.pie_chart_rounded),
             label: 'Categories',
           ),
+          NavigationDestination(
+            icon: Icon(Icons.settings_outlined),
+            selectedIcon: Icon(Icons.settings_rounded),
+            label: 'Settings',
+          ),
         ],
       ),
     );