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Miguel Angel Simon Sierra
bc5fc410ee
L4 polish for the stacking-layer timeline: - Sub-composition layers group under a slim "Inside: <comp>" header with a green accent, so it reads that restacking there is scoped to that context. - Audio clips render in a distinct bottom lane: separator border, muted row bg, music glyph in the gutter, beat strip — clearly not part of the z-order stack. - During a vertical drag, a drop affordance shows join-vs-insert: an "onto" target highlights the row (join that layer / same z); "between"/"above"/ "below" shows an insertion line (new layer here). New pure helper timelineDropIndicator.ts (+ test) maps placement -> indicator; row-group rendering extracted into TimelineLayerGroupHeader / TimelineLayerGutter / TimelineDropInsertionLine / TimelineDragGhost to keep files under the 600 cap.