Long oven bakes (thumbnail stage can run up to 150s) looked identical to a hang — the same 'Baking thumbnail...' text sat on screen with no sense of motion and no way to tell if anything was happening. Reported while regenerating $tam when it took a while and the user felt stuck without clear feedback. Adds three overlapping signals during pollJobStatus: 1. Live elapsed seconds appended to the progress overlay detail after 5s, formatted as '· 12s' / '· 1m 4s'. Updates every poll tick. 2. Track-log entry on entering any long-running stage (thumbnail, bundle, ipfs, metadata) so there's a timestamped record of when it began. 3. Track-log heartbeat at 20s from stage start, then every 30s while the stage is still active. Prevents the 'is this frozen?' feeling during the oven's 150s ceiling. On stage completion a 'took Ns' entry lands in the track log for the same long-running stages, and the timeline detail gets the total time appended so it survives after the flow moves on. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>