fix(account): update country details page navigation

- Replace EntityDetailsPageArguments with entityId and contentType
- Improve type safety and navigation accuracy in followed countries list

Author: fulleni

lib/account/view/manage_followed_items/countries/followed_countries_list_page.dart

@@ -99,7 +99,10 @@ class FollowedCountriesListPage extends StatelessWidget {
                 onTap: () {
                   context.push(
                     Routes.countryDetails,
-                    extra: EntityDetailsPageArguments(entity: country),
+                    extra: EntityDetailsPageArguments(
+                      entityId: country.id,
+                      contentType: ContentType.country,
+                    ),
                   );
                 },
               );