Beat grid consumed from Lane C's /beats: one top-level scene.beatGrid (beats
kept in FILE seconds, effective offset re-derived from the audio clip so
dragging the audio drags the grid and head-trim leaves it put). beat and bar
join the snap selector, so keys, clip and audio blocks, both trim edges, cuts
and the playhead all became musical for free. Grid drawn faint on beats and
brighter on downbeats, suppressed below ~7px spacing. Low confidence still
snaps but says so. Tempo extrapolates past the analysed range.
FILM panel mounts inside #timeline: sequence CRUD, editable shot rows (scene
dropdown, in/out, cut|dissolve + seconds, reorder, delete), live runtime, size
picker, and Render film with per-shot/per-frame progress - gated behind
hasContent() + a confirm that says plainly every shot replaces the open scene,
and locked while running so it cannot be started twice. film.js imported
lazily so its absence cannot stop the timeline mounting.
Verified live: grid 128.02 BPM/35 beats off house128.wav, snapped positions
8-10ms from the true 0.468735s grid across the whole file, bar snap hits a
downbeat, grid survives toJSON->load; FILM lists both sequences with the
server's 11.50s runtime and 3 editable rows.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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