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Ular Kimsanov
8d7179fc0c
What: the NLE clip-drag engine core: timelineClipDragPreview (zone-aware preview placement; keeps the legacy resolveDragPreviewPlacement export until the timeline swap), timelineClipDragCommit (drop → move/insert commit, stacking-synced) and timelineElementsMove (batched ripple/insert move with GSAP position shifting), with test suites. Why: the drag-drop brain, reviewable as functions before any component mounts it. How: new files plus one authored intermediate (preview file = final content + legacy export the old engine still imports); consumes the collision/ snapping/zones/stacking modules and the coexistence layer. Test plan: bunx vitest run on both test suites; tsc --noEmit; fallow audit clean.