fix(chat): isolate pending flows and cancel stale requests

src/stores/chat/chat-history-sync.ts

@@ -4,6 +4,7 @@ import { loadChatRepository } from "@/data/repositories/chat_repository_loader";
 import { Logger } from "@/utils/logger";
 import { Result } from "@/utils/result";
 import { todayString } from "@/utils/date";
+import { isAbortError } from "@/utils/abort";
 
 import { CHAT_HISTORY_LIMIT } from "./helper/history";
 import { localMessagesToUi } from "./helper/message-mappers";
@@ -81,6 +82,7 @@ export async function syncNetworkHistory(
   characterId: string,
   localCount: number,
   cacheIdentity: string | null,
+  signal?: AbortSignal,
 ): Promise<NetworkHistorySyncOutput | null> {
   const chatRepo = await loadChatRepository();
   const greetingMessage = createGreetingMessage();
@@ -89,13 +91,16 @@ export async function syncNetworkHistory(
     characterId,
     CHAT_HISTORY_LIMIT,
     0,
+    { signal },
   );
   if (Result.isErr(networkResult)) {
+    if (isAbortError(networkResult.error)) throw networkResult.error;
     log.error("[chat-machine] loadHistory NETWORK FAILED", {
       error: networkResult.error,
     });
     return null;
   }
+  signal?.throwIfAborted();
 
   const networkUi = localMessagesToUi(networkResult.data.messages);
   log.debug("[chat-machine] loadHistory NETWORK DONE", {
@@ -144,6 +149,7 @@ export async function syncNetworkHistory(
  */
 export async function readAndSyncHistory(
   characterId: string,
+  signal?: AbortSignal,
 ): Promise<ReadAndSyncHistoryOutput> {
   const cacheIdentity = await resolveHistoryCacheIdentity(characterId);
   const localSnapshot = await readLocalHistorySnapshot(cacheIdentity);
@@ -151,6 +157,7 @@ export async function readAndSyncHistory(
     characterId,
     localSnapshot.localCount,
     cacheIdentity,
+    signal,
   );
   if (networkSnapshot) return networkSnapshot;