feat(chat): send idempotent client message ids

src/data/repositories/chat_remote_data_source.ts

@@ -17,6 +17,7 @@ import {
 } from "@/data/schemas/chat";
 import type { ChatApi } from "@/data/services/api";
 import { Result } from "@/utils/result";
+import { createClientMessageId } from "@/lib/chat/client_message_id";
 
 export class ChatRemoteDataSource {
   constructor(private readonly api: ChatApi) {}
@@ -29,6 +30,7 @@ export class ChatRemoteDataSource {
     return Result.wrap(async () => {
       const request = SendMessageRequestSchema.parse({
         characterId,
+        clientMessageId: options?.clientMessageId ?? createClientMessageId(),
         message,
         ...(options?.imageId ? { imageId: options.imageId } : {}),
         ...(options?.imageThumbUrl