- scene: mark-group model (resolve/selection->marks/seg-local/marks->rows);
drop legacy tl.marks/tl.md
- authoring: draft is a normal annotation group flagged :draft; generic
put-group + with-let cancel; two-input click-to-fill editor in mark time
- timeline: dashed draft preview, numeric track ordering
- video frame readout (track+clip, mark time) clickable to fill an endpoint
- discontinuity jump popover; nested-annotation count badge
- localStorage persistence of the authored annotation layer
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
