refactor(content_management): enhance archived headlines state management

- Replace sealed class with enum for status representation
- Expand ArchivedHeadlinesState with additional properties
- Implement copyWith method for state immutability
- Update props list for Equatable

Author: fulleni

lib/content_management/bloc/archived_headlines/archived_headlines_state.dart

@@ -1,10 +1,51 @@
 part of 'archived_headlines_bloc.dart';
 
-sealed class ArchivedHeadlinesState extends Equatable {
-  const ArchivedHeadlinesState();
-  
-  @override
-  List<Object> get props => [];
+/// Represents the status of archived content operations.
+enum ArchivedHeadlinesStatus {
+  initial,
+  loading,
+  success,
+  failure,
 }
 
-final class ArchivedHeadlinesInitial extends ArchivedHeadlinesState {}
+/// The state for the archived content feature.
+class ArchivedHeadlinesState extends Equatable {
+  const ArchivedHeadlinesState({
+    this.status = ArchivedHeadlinesStatus.initial,
+    this.headlines = const [],
+    this.cursor,
+    this.hasMore = false,
+    this.exception,
+  });
+
+  final ArchivedHeadlinesStatus status;
+  final List<Headline> headlines;
+  final String? cursor;
+  final bool hasMore;
+  final HttpException? exception;
+
+  ArchivedHeadlinesState copyWith({
+    ArchivedHeadlinesStatus? status,
+    List<Headline>? headlines,
+    String? cursor,
+    bool? hasMore,
+    HttpException? exception,
+  }) {
+    return ArchivedHeadlinesState(
+      status: status ?? this.status,
+      headlines: headlines ?? this.headlines,
+      cursor: cursor ?? this.cursor,
+      hasMore: hasMore ?? this.hasMore,
+      exception: exception ?? this.exception,
+    );
+  }
+
+  @override
+  List<Object?> get props => [
+        status,
+        headlines,
+        cursor,
+        hasMore,
+        exception,
+      ];
+}