make settings a child route

app/lib/core/routing/routes.dart

@@ -15,6 +15,9 @@ part 'routes.g.dart';
     TypedGoRoute<AboutRoute>(
       path: 'about',
     ),
+    TypedGoRoute<SettingsRoute>(
+      path: 'settings',
+    ),
   ],
 )
 class KagiRoute extends GoRouteData {
@@ -39,9 +42,6 @@ class KagiRoute extends GoRouteData {
   }
 }
 
-@TypedGoRoute<SettingsRoute>(
-  path: '/settings',
-)
 class SettingsRoute extends GoRouteData {
   @override
   Widget build(BuildContext context, GoRouterState state) {

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

@@ -8,7 +8,6 @@ part of 'routes.dart';
 
 List<RouteBase> get $appRoutes => [
       $kagiRoute,
-      $settingsRoute,
     ];
 
 RouteBase get $kagiRoute => GoRouteData.$route(
@@ -19,6 +18,10 @@ RouteBase get $kagiRoute => GoRouteData.$route(
           path: 'about',
           factory: $AboutRouteExtension._fromState,
         ),
+        GoRouteData.$route(
+          path: 'settings',
+          factory: $SettingsRouteExtension._fromState,
+        ),
       ],
     );
 
@@ -56,11 +59,6 @@ extension $AboutRouteExtension on AboutRoute {
   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();