Add Job.downloadProgress (0.0-1.0), derived from a worker background
poller that counts audio files landing in staging / expected track
count, since streamrip only reports 0/1. No UI yet (slice B).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
- Worker stamps a throttled worker.heartbeat; GET /api/worker reports online
from its updatedAt recency (DB-time); masthead shows a live listening/offline
dot instead of a static decoration.
- /api/requests enriched with rgMbid; Recently Pressed shows cover thumbs.
- Library album count moved from the filter row into a section header.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>