fix(studio): timeline snapping#2269
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What: new pure module timelineCollision — zone-aware drop placement (clampTrackToZone, resolveZoneDropPlacement, resolveInsertRow, resolvePlacement, lane/overlap predicates) with its full test suite. Why: the no-overlap core of the NLE clip-drag engine; plain functions, no DOM, no React, no store writes. How: new files only; type-only imports from the existing playerStore. First runtime consumer arrives with the drag-engine PRs. Test plan: bunx vitest run timelineCollision.test.ts; tsc --noEmit; fallow audit clean (all exports test-consumed).
What: new pure module timelineSnapping — snap-target collection and pixel-threshold time snapping (collectTimelineSnapTargets, snapTimelineTime, snapMoveToTargets) with tests. Why: the magnet math for clip drags/trims, reviewable standalone. How: new files only; type-only playerStore imports; consumers land with the drag engine. Test plan: bunx vitest run timelineSnapping.test.ts; tsc --noEmit; fallow audit clean.
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Continuation of closed #2196 after Graphite branch-deletion race; preserves the verified timeline snapping change.