feat(account): sort topics alphabetically by name

- Add sorting to the readAll() method in TopicsRepository
- Sort topics by 'name' in ascending order
- Add a TODO comment for potential future pagination implementation

Author: fulleni

lib/account/bloc/available_topics_bloc.dart

@@ -28,7 +28,10 @@ class AvailableTopicsBloc
     }
     emit(state.copyWith(status: AvailableTopicsStatus.loading));
     try {
-      final response = await _topicsRepository.readAll();
+      // TODO(fulleni): Add pagination if necessary for very large datasets.
+      final response = await _topicsRepository.readAll(
+        sort: [const SortOption('name')],
+      );
       emit(
         state.copyWith(
           status: AvailableTopicsStatus.success,