Improve generation task client errors

src/api/taskSubscription.ts

@@ -54,15 +54,13 @@ export function waitForTask(
       if (event.status === "completed") {
         settle(() => resolve(event.resultUrl || null));
       } else if (event.status === "failed" || event.status === "cancelled") {
-        settle(() => reject(new Error(event.error || "任务失败")));
+        settle(() => reject(new Error(event.error || "任务失败，请稍后重试")));
       }
     };
 
-    // Try SSE first
     cleanup = aiGenerationClient.subscribeTaskStatus(taskId, handleUpdate);
     sseConnected = true;
 
-    // Fallback: if SSE doesn't deliver any event within 5s, switch to polling
     fallbackTimerId = setTimeout(() => {
       if (settled || !sseConnected) return;
       if (cleanup) cleanup();
@@ -72,7 +70,10 @@ export function waitForTask(
     function startPolling() {
       const poll = async () => {
         while (!settled) {
-          if (abortRef?.current) { settle(() => resolve(null)); return; }
+          if (abortRef?.current) {
+            settle(() => resolve(null));
+            return;
+          }
           await new Promise((r) => setTimeout(r, POLL_INTERVAL));
           if (settled || abortRef?.current) return;
           try {