fix(account): update source details navigation on followed sources page

- Replace deprecated EntityDetailsPageArguments constructor
- Use entityId and contentType instead of entity object
- Ensure proper navigation to source details page

Author: fulleni

lib/account/view/manage_followed_items/sources/followed_sources_list_page.dart

@@ -96,7 +96,10 @@ class FollowedSourcesListPage extends StatelessWidget {
                 onTap: () {
                   context.push(
                     Routes.sourceDetails,
-                    extra: EntityDetailsPageArguments(entity: source),
+                    extra: EntityDetailsPageArguments(
+                      entityId: source.id,
+                      contentType: ContentType.source,
+                    ),
                   );
                 },
               );