feat: Implement clear chat, delete conversation, mute, and report options within the chat screen.

lib/features/messaging/data/messaging_repository.dart

@@ -160,6 +160,32 @@ class MessagingRepository {
       );
     }
   }
+
+  /// DELETE /messages/conversations/:id/messages — clear all messages
+  Future<void> clearChat(String conversationId) async {
+    try {
+      await _dio.delete('${ApiConstants.conversations}/$conversationId/messages');
+    } on DioException catch (e) {
+      if (e.error is ApiException) throw e.error as ApiException;
+      throw ApiException(
+        message: e.message ?? 'Failed to clear chat',
+        statusCode: e.response?.statusCode,
+      );
+    }
+  }
+
+  /// DELETE /messages/conversations/:id — delete conversation entirely
+  Future<void> deleteConversation(String conversationId) async {
+    try {
+      await _dio.delete('${ApiConstants.conversations}/$conversationId');
+    } on DioException catch (e) {
+      if (e.error is ApiException) throw e.error as ApiException;
+      throw ApiException(
+        message: e.message ?? 'Failed to delete conversation',
+        statusCode: e.response?.statusCode,
+      );
+    }
+  }
 }
 
 final messagingRepositoryProvider = Provider<MessagingRepository>((ref) {