added about dialog

app/lib/core/routing/dialog_page.dart

@@ -0,0 +1,40 @@
+import 'package:flutter/material.dart';
+
+/// A dialog page with Material entrance and exit animations, modal barrier color,
+/// and modal barrier behavior (dialog is dismissible with a tap on the barrier).
+class DialogPage<T> extends Page<T> {
+  final Offset? anchorPoint;
+  final Color? barrierColor;
+  final bool barrierDismissible;
+  final String? barrierLabel;
+  final bool useSafeArea;
+  final CapturedThemes? themes;
+  final WidgetBuilder builder;
+
+  const DialogPage({
+    required this.builder,
+    this.anchorPoint,
+    this.barrierColor = Colors.black54,
+    this.barrierDismissible = true,
+    this.barrierLabel,
+    this.useSafeArea = true,
+    this.themes,
+    super.key,
+    super.name,
+    super.arguments,
+    super.restorationId,
+  });
+
+  @override
+  Route<T> createRoute(BuildContext context) => DialogRoute<T>(
+        context: context,
+        settings: this,
+        builder: builder,
+        anchorPoint: anchorPoint,
+        barrierColor: barrierColor,
+        barrierDismissible: barrierDismissible,
+        barrierLabel: barrierLabel,
+        useSafeArea: useSafeArea,
+        themes: themes,
+      );
+}

app/lib/core/routing/routes.dart

@@ -1,3 +1,5 @@
+import 'package:bang_navigator/core/routing/dialog_page.dart';
+import 'package:bang_navigator/features/about/presentation/screens/about.dart';
 import 'package:bang_navigator/features/search_browser/presentation/screens/browser.dart';
 import 'package:bang_navigator/features/settings/data/repositories/settings_repository.dart';
 import 'package:bang_navigator/features/settings/presentation/screens/settings.dart';
@@ -9,6 +11,11 @@ part 'routes.g.dart';
 
 @TypedGoRoute<KagiRoute>(
   path: '/',
+  routes: [
+    TypedGoRoute<AboutRoute>(
+      path: 'about',
+    ),
+  ],
 )
 class KagiRoute extends GoRouteData {
   KagiRoute();
@@ -41,3 +48,10 @@ class SettingsRoute extends GoRouteData {
     return const SettingsScreen();
   }
 }
+
+class AboutRoute extends GoRouteData {
+  @override
+  Page<void> buildPage(BuildContext context, GoRouterState state) {
+    return DialogPage(builder: (_) => const AboutDialogScreen());
+  }
+}

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

@@ -14,6 +14,12 @@ List<RouteBase> get $appRoutes => [
 RouteBase get $kagiRoute => GoRouteData.$route(
       path: '/',
       factory: $KagiRouteExtension._fromState,
+      routes: [
+        GoRouteData.$route(
+          path: 'about',
+          factory: $AboutRouteExtension._fromState,
+        ),
+      ],
     );
 
 extension $KagiRouteExtension on KagiRoute {
@@ -33,6 +39,23 @@ extension $KagiRouteExtension on KagiRoute {
   void replace(BuildContext context) => context.replace(location);
 }
 
+extension $AboutRouteExtension on AboutRoute {
+  static AboutRoute _fromState(GoRouterState state) => AboutRoute();
+
+  String get location => GoRouteData.$location(
+        '/about',
+      );
+
+  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,