添加视频生成状态超时处理，限制处理时间为8分钟

@@ -36,6 +36,9 @@ export const pollVideoStatus = (
     onStatusUpdate: (status: VideoStatus) => void
 ): Promise<VideoStatus> => {
   return new Promise((resolve, reject) => {
+    let processingStartTime: number | null = null;
+    const PROCESSING_TIMEOUT_MS = 8 * 60 * 1000; // 8 minutes limit for processing
+
     const interval = setInterval(async () => {
       try {
         const res = await fetch(`${TURBO_DIFFUSION_API_URL}/status/${taskId}`);
@@ -49,6 +52,17 @@ export const pollVideoStatus = (
         const data: VideoStatus = await res.json();
         onStatusUpdate(data);
 
+        // Track processing time
+        if (data.status === 'processing') {
+            if (processingStartTime === null) {
+                processingStartTime = Date.now();
+            } else if (Date.now() - processingStartTime > PROCESSING_TIMEOUT_MS) {
+                clearInterval(interval);
+                reject(new Error("Video generation timed out (8 minutes processing limit)."));
+                return;
+            }
+        }
+
         if (data.status === 'complete' || data.status === 'failed') {
           clearInterval(interval);
           if (data.status === 'failed') {
@@ -58,9 +72,8 @@ export const pollVideoStatus = (
           }
         }
       } catch (error) {
-        clearInterval(interval);
-        console.error('Polling error:', error);
-        reject(error);
+        // Don't stop polling on transient network errors
+        console.warn('Polling transient error:', error);
       }
     }, 2000); // Poll every 2 seconds
   });