feat: add global article details route

Author: fulleni

lib/router/routes.dart

@@ -96,6 +96,12 @@ abstract final class Routes {
       'article/:id'; // Relative to accountSavedHeadlines
   static const String accountArticleDetailsName = 'accountArticleDetails';
 
+  // --- Global Article Details ---
+  // This route is intended for accessing article details from contexts
+  // outside the main bottom navigation shell (e.g., from entity detail pages).
+  static const globalArticleDetails = '/article/:id'; // Top-level path
+  static const globalArticleDetailsName = 'globalArticleDetails';
+
   // --- Manage Followed Items Sub-Routes (relative to /account/manage-followed-items) ---
   static const followedCategoriesList = 'categories';
   static const followedCategoriesListName = 'followedCategoriesList';