refactor(headlines-feed): remove followed topics from TopicsFilterState

- Remove followedTopicsStatus and followedTopics properties
- Update copyWith method to remove followedTopics-related parameters
- Update props list to exclude followedTopics and followedTopicsStatus

Author: fulleni

lib/headlines-feed/bloc/topics_filter_state.dart

@@ -32,8 +32,6 @@ final class TopicsFilterState extends Equatable {
     this.hasMore = true,
     this.cursor,
     this.error,
-    this.followedTopicsStatus = TopicsFilterStatus.initial,
-    this.followedTopics = const [],
   });
 
   /// The current status of fetching topics.
@@ -52,24 +50,15 @@ final class TopicsFilterState extends Equatable {
   /// An optional error object if the status is [TopicsFilterStatus.failure].
   final HttpException? error;
 
-  /// The current status of fetching followed topics.
-  final TopicsFilterStatus followedTopicsStatus;
-
-  /// The list of [Topic] objects representing the user's followed topics.
-  final List<Topic> followedTopics;
-
   /// Creates a copy of this state with the given fields replaced.
   TopicsFilterState copyWith({
     TopicsFilterStatus? status,
     List<Topic>? topics,
     bool? hasMore,
     String? cursor,
     HttpException? error,
-    TopicsFilterStatus? followedTopicsStatus,
-    List<Topic>? followedTopics,
     bool clearError = false,
     bool clearCursor = false,
-    bool clearFollowedTopicsError = false,
   }) {
     return TopicsFilterState(
       status: status ?? this.status,
@@ -79,8 +68,6 @@ final class TopicsFilterState extends Equatable {
       cursor: clearCursor ? null : (cursor ?? this.cursor),
       // Clear error if requested, otherwise keep existing or use new one
       error: clearError ? null : error ?? this.error,
-      followedTopicsStatus: followedTopicsStatus ?? this.followedTopicsStatus,
-      followedTopics: followedTopics ?? this.followedTopics,
     );
   }
 
@@ -91,7 +78,5 @@ final class TopicsFilterState extends Equatable {
     hasMore,
     cursor,
     error,
-    followedTopicsStatus,
-    followedTopics,
   ];
 }