Improve music activity reporting and preserve Comfy host fixes

server/utils/jobs.ts

@@ -31,6 +31,7 @@ export interface JobEvent {
 }
 
 export interface Job {
+  musicActivity?: { checkedAt: number; running: boolean }
   id: string
   kind?: 'video' | 'edit' | 'music'
   promptId?: string
@@ -192,6 +193,8 @@ export function jobSnapshot(job: Job) {
   return {
     jobId: job.id,
     kind: job.kind || 'video',
+    engine: job.library?.engine,
+    musicActivity: job.musicActivity,
     type: 'snapshot' as const,
     status: job.status,
     message: job.message,