first implementation finished

app/lib/core/routing/routes.dart

@@ -0,0 +1,43 @@
+import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:kagi_bang_bang/features/search_browser/presentation/screens/browser.dart';
+import 'package:kagi_bang_bang/features/settings/data/repositories/settings_repository.dart';
+import 'package:kagi_bang_bang/features/settings/presentation/screens/settings.dart';
+
+part 'routes.g.dart';
+
+@TypedGoRoute<KagiRoute>(
+  path: '/',
+)
+class KagiRoute extends GoRouteData {
+  KagiRoute();
+
+  @override
+  Future<String?> redirect(BuildContext context, GoRouterState state) async {
+    final hasKagiSession = await ProviderScope.containerOf(context)
+        .read(settingsRepositoryProvider.future)
+        .then((value) => value.kagiSession?.isNotEmpty ?? false);
+
+    if (!hasKagiSession) {
+      return SettingsRoute().location;
+    }
+
+    return null;
+  }
+
+  @override
+  Widget build(BuildContext context, GoRouterState state) {
+    return const KagiScreen();
+  }
+}
+
+@TypedGoRoute<SettingsRoute>(
+  path: '/settings',
+)
+class SettingsRoute extends GoRouteData {
+  @override
+  Widget build(BuildContext context, GoRouterState state) {
+    return const SettingsScreen();
+  }
+}

app/lib/core/routing/routes.g.dart

@@ -0,0 +1,56 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'routes.dart';
+
+// **************************************************************************
+// GoRouterGenerator
+// **************************************************************************
+
+List<RouteBase> get $appRoutes => [
+      $kagiRoute,
+      $settingsRoute,
+    ];
+
+RouteBase get $kagiRoute => GoRouteData.$route(
+      path: '/',
+      factory: $KagiRouteExtension._fromState,
+    );
+
+extension $KagiRouteExtension on KagiRoute {
+  static KagiRoute _fromState(GoRouterState state) => KagiRoute();
+
+  String get location => GoRouteData.$location(
+        '/',
+      );
+
+  void go(BuildContext context) => context.go(location);
+
+  Future<T?> push<T>(BuildContext context) => context.push<T>(location);
+
+  void pushReplacement(BuildContext context) =>
+      context.pushReplacement(location);
+
+  void replace(BuildContext context) => context.replace(location);
+}
+
+RouteBase get $settingsRoute => GoRouteData.$route(
+      path: '/settings',
+      factory: $SettingsRouteExtension._fromState,
+    );
+
+extension $SettingsRouteExtension on SettingsRoute {
+  static SettingsRoute _fromState(GoRouterState state) => SettingsRoute();
+
+  String get location => GoRouteData.$location(
+        '/settings',
+      );
+
+  void go(BuildContext context) => context.go(location);
+
+  Future<T?> push<T>(BuildContext context) => context.push<T>(location);
+
+  void pushReplacement(BuildContext context) =>
+      context.pushReplacement(location);
+
+  void replace(BuildContext context) => context.replace(location);
+}