When a video that already has a barrier_opening row is loaded, a thin
bar now appears below the player with a red vertical line at the
marked opening_s. A tooltip shows the timestamp, the analyst's
initials, and the bad_rois flag. Clicking the line snaps the player
to the exact opening; clicking elsewhere on the bar seeks
proportionally. Bar is hidden for un-annotated videos.
API change: each queue item now carries an `existing` field with the
opening_s, bad_rois, analyst, etc. from barrier_opening.csv when
available, so the frontend can paint the mark without extra requests.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Giorgio Gilestro
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