Function findTopicByStartMessageId

src/renderer/src/services/messagesService.ts:527–529

(topics: Topic[], messageId: string)

 * 用于判断消息是否是某个 Topic 的起始消息
 */
export function findTopicByStartMessageId(topics: Topic[], messageId: string): Topic | undefined {
  return topics.find((t) => t.startMessageId === messageId)
}