perf(content_management): prevent redundant API calls for topics

- Add a condition to check if topics are already loaded and it's not a pagination request
- If the condition is met, the function returns early without making a new API call
- This optimization reduces unnecessary network requests when switching tabs

Author: fulleni

lib/content_management/bloc/content_management_bloc.dart

@@ -174,6 +174,14 @@ class ContentManagementBloc
     LoadTopicsRequested event,
     Emitter<ContentManagementState> emit,
   ) async {
+    // If topics are already loaded and it's not a pagination request,
+    // do not re-fetch. This prevents redundant API calls on tab changes.
+    if (state.topicsStatus == ContentManagementStatus.success &&
+        state.topics.isNotEmpty &&
+        event.startAfterId == null) {
+      return;
+    }
+
     emit(state.copyWith(topicsStatus: ContentManagementStatus.loading));
     try {
       final isPaginating = event.startAfterId != null;