Replace the HLS 'connecting…' player in the library with a real frame grabbed
from the start of the recording, while the recording is still live.
Flow:
- recorders.js already pre-creates the asset as status='live' + ASSET_ID env
- capture-manager.start() fires _publishLiveThumbnail() (non-blocking): polls
/live/<id> for the first seg-*.ts, extracts frame 0 via ffmpeg (scaled JPEG,
yuvj420p), uploads to S3 thumbnails/<id>.jpg, then POSTs the key to mam-api
- new mam-api POST /assets/:id/live-thumbnail sets thumbnail_s3_key on the still
-live row (status untouched); idempotent no-op once finalized
- visuals.jsx AssetThumb: for live assets, show the static poster once the key /
signed URL is available, else fall back to the live HLS preview. Pulsing LIVE
border kept either way
- POST /assets gains an optional status param (default 'processing'); 'live'
skips the proxy/thumbnail queue
- capture /stop route now finalizes the pre-created asset by id (guarded) instead
of POSTing a duplicate
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