feat(router): add nested routes for create/edit

- Added create headline route
- Added create/edit category routes
- Added create/edit source routes

Author: fulleni

lib/router/router.dart

@@ -18,6 +18,7 @@ import 'package:ht_dashboard/dashboard/view/dashboard_page.dart';
 import 'package:ht_dashboard/l10n/l10n.dart';
 import 'package:ht_dashboard/router/routes.dart';
 import 'package:ht_dashboard/settings/view/settings_page.dart';
+import 'package:ht_dashboard/shared/widgets/placeholder_create_page.dart';
 
 /// Creates and configures the GoRouter instance for the application.
 ///
@@ -165,16 +166,66 @@ GoRouter createRouter({
                     path: Routes.headlines,
                     name: Routes.headlinesName,
                     builder: (context, state) => const HeadlinesPage(),
+                    routes: [
+                      GoRoute(
+                        path: Routes.createHeadline,
+                        name: Routes.createHeadlineName,
+                        builder: (context, state) =>
+                            const PlaceholderCreatePage(
+                          title: 'Create New Headline',
+                        ), // Placeholder
+                      ),
+                    ],
                   ),
                   GoRoute(
                     path: Routes.categories,
                     name: Routes.categoriesName,
                     builder: (context, state) => const CategoriesPage(),
+                    routes: [
+                      GoRoute(
+                        path: Routes.createCategory,
+                        name: Routes.createCategoryName,
+                        builder: (context, state) =>
+                            const PlaceholderCreatePage(
+                          title: 'Create New Category',
+                        ), // Placeholder
+                      ),
+                      GoRoute(
+                        path: Routes.editCategory,
+                        name: Routes.editCategoryName,
+                        builder: (context, state) {
+                          final id = state.pathParameters['id']!;
+                          return PlaceholderCreatePage(
+                            title: 'Edit Category $id',
+                          ); // Placeholder
+                        },
+                      ),
+                    ],
                   ),
                   GoRoute(
                     path: Routes.sources,
                     name: Routes.sourcesName,
                     builder: (context, state) => const SourcesPage(),
+                    routes: [
+                      GoRoute(
+                        path: Routes.createSource,
+                        name: Routes.createSourceName,
+                        builder: (context, state) =>
+                            const PlaceholderCreatePage(
+                          title: 'Create New Source',
+                        ), // Placeholder
+                      ),
+                      GoRoute(
+                        path: Routes.editSource,
+                        name: Routes.editSourceName,
+                        builder: (context, state) {
+                          final id = state.pathParameters['id']!;
+                          return PlaceholderCreatePage(
+                            title: 'Edit Source $id',
+                          ); // Placeholder
+                        },
+                      ),
+                    ],
                   ),
                 ],
               ),

lib/router/routes.dart

@@ -50,18 +50,48 @@ abstract final class Routes {
   /// The name for the headlines page route.
   static const String headlinesName = 'headlines';
 
+  /// The path for creating a new headline.
+  static const String createHeadline = 'create-headline';
+
+  /// The name for the create headline page route.
+  static const String createHeadlineName = 'createHeadline';
+
   /// The path for the categories page within content management.
   static const String categories = 'categories';
 
   /// The name for the categories page route.
   static const String categoriesName = 'categories';
 
+  /// The path for creating a new category.
+  static const String createCategory = 'create-category';
+
+  /// The name for the create category page route.
+  static const String createCategoryName = 'createCategory';
+
+  /// The path for editing an existing category.
+  static const String editCategory = 'edit-category/:id';
+
+  /// The name for the edit category page route.
+  static const String editCategoryName = 'editCategory';
+
   /// The path for the sources page within content management.
   static const String sources = 'sources';
 
   /// The name for the sources page route.
   static const String sourcesName = 'sources';
 
+  /// The path for creating a new source.
+  static const String createSource = 'create-source';
+
+  /// The name for the create source page route.
+  static const String createSourceName = 'createSource';
+
+  /// The path for editing an existing source.
+  static const String editSource = 'edit-source/:id';
+
+  /// The name for the edit source page route.
+  static const String editSourceName = 'editSource';
+
   /// The path for the app configuration page.
   static const String appConfiguration = '/app-configuration';