Fix generation progress getting stuck at 1% after Comfy finishes.

Poll Comfy history and the job snapshot so the browser still gets the video when the live stream is buffered or the websocket misses completion.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/utils/jobs.ts

@@ -42,6 +42,7 @@ export interface Job {
     thumb?: Buffer
   }
   error?: string
+  socketReady?: boolean
   events: JobEvent[]
   listeners: Set<(event: JobEvent) => void>
 }
@@ -74,6 +75,25 @@ export function getJob(id: string) {
   return jobs.get(id)
 }
 
+export function jobSnapshot(job: Job) {
+  return {
+    type: 'snapshot' as const,
+    status: job.status,
+    message: job.message,
+    progress: job.progress,
+    step: job.step,
+    maxStep: job.maxStep,
+    promptId: job.promptId,
+    elapsedMs: Date.now() - job.startedAt,
+    filename: job.video?.filename,
+    subfolder: job.video?.subfolder,
+    mediaType: job.video?.type,
+    clipId: job.clipId,
+    hideThumbnail: job.hideThumbnail,
+    error: job.error
+  }
+}
+
 export function emitJob(job: Job, event: JobEvent) {
   if (event.message) job.message = event.message
   if (typeof event.progress === 'number') job.progress = event.progress