fix(studio): continuation of #2205#2275
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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.
What: new pure module timelineMultiDragPreview — group-drag passenger offsets and clamped group deltas (isMultiDragActive, multiDragDeltaSeconds, multiDragPassengerOffsetPx, clampGroupMoveDelta) with tests. Why: the group-drag math, standalone and DOM-free. How: new files only; consumed later by TimelineLanes. Test plan: bunx vitest run timelineMultiDragPreview.test.ts; tsc --noEmit; fallow audit clean.
What: new pure module timelineStackingSync — lane order ↔ z-index reconciliation (laneIsAbove, computeStackingPatches) with tests. Why: the single source of truth for how timeline lane order maps to canvas stacking; the ordering rules and tie-breaks live here. How: new files only; consumed later by timelineZones and the stacking-sync hook. Test plan: bunx vitest run timelineStackingSync.test.ts; tsc --noEmit; fallow audit clean.
What: new pure module timelineZones — visual/audio track-zone classification (classifyZone) and normalizeToZones, which re-packs lanes into zone-consistent rows; tests cover the stacking/zones interaction. Why: completes the z-model started in the stacking-sync PR. How: new files; consumes isAudioTimelineElement (leaf-helpers PR) and computeStackingPatches (stacking-sync PR); type-only playerStore imports. Test plan: bunx vitest run timelineZones.test.ts; tsc --noEmit; fallow audit clean.
What: two small pure modules with tests — assetClickBehavior (click vs double-click policy for sidebar assets) and canvasNudgeGate (debounce gate for arrow-key canvas nudges). Why: policy dependencies of the upcoming asset card and nudge hook, reviewable as plain decision tables. How: new files only. Test plan: bunx vitest run on both test files; tsc --noEmit; fallow audit clean.
…tory What: two test-only suites pinning CURRENT behavior before the NLE swap: anchoredResizeReleaseShift.test.ts (manual-offset resize release commits) and useRazorSplit.history.test.tsx (razor split undo/redo history). Why: regression tripwires — the later glue-swap PRs must keep these green. How: test files only; they import existing main modules unchanged and pass against them as-is. Test plan: bunx vitest run on both suites; fallow audit clean.
What: CanvasContextMenu (right-click menu for canvas selections) and canvasContextMenuZOrder (tie-aware bring-forward/send-backward z-order patch computation) with its test suite. Shipped unwired. Why: the z-order rules are the substance; mounting is one line in the later overlay swap. How: new files, compiled against current main. Nothing mounts the menu yet, so .fallowrc.jsonc gains TEMP(studio-dnd) entries (entry registration + ignoreExports) — removed by the app-shell swap PR that wires everything. Test plan: bunx vitest run canvasContextMenuZOrder.test.ts; tsc --noEmit; fallow audit clean.
What: domEditNudge — pure nudge-step math (direction × modifier → delta, commit debounce constant) with tests. Shipped unwired. Why: small standalone concept consumed by the canvas nudge hook in the chrome-components PR. How: new files; one TEMP(studio-dnd) ignoreExports entry until the consumer lands (removed by the app-shell swap PR). Test plan: bunx vitest run domEditNudge.test.ts; tsc --noEmit; fallow audit clean.
…s (unwired) What: the NLE shell layer, unwired: NLEContext (provider extracted from NLELayout), PreviewPane, AssetPreviewOverlay + assetPreviewStore, TimelineOverlays (menus/modal/hint extracted from Timeline), timelineClipChildren, timelineClipDragTypes, useTimelinePlayerLoop (playback loop extracted from useTimelinePlayer). Why: the extracted replacements for NLELayout/StudioPreviewArea and the oversized Timeline/useTimelinePlayer internals, reviewable standalone. How: new files only, tsc-clean against main. They intentionally duplicate blocks of their still-alive originals (duplication is warn-level in fallow; the swap PRs delete the originals). Dead-file findings covered by TEMP(studio-dnd) entry registrations, removed at the app-shell swap. Test plan: tsc --noEmit; bunx vitest run (suite unchanged); fallow audit clean.
What: extends 21 glue files so the OLD timeline/canvas engine and the NEW NLE components type-check side by side: playerStore (multi-select setters, zoom pin, snap toggle, non-reactive scale scratch), drag-state types gain optional NLE fields, timelineLayout/timelineAssetDrop/timelineEditingHelpers/ timelineEditing/timelineElementHelpers/studioHelpers/assetHelpers gain the NLE exports, DomEditOverlay + gestures + AssetContextMenu + Timeline props gain optional callbacks/params, contexts gain *Optional hooks, and TimelineEditCallbacks.onMoveElements becomes a bivariant method accepting both engines' change shapes. patchDocumentRootDuration's test rides along. Why: this is the keystone that dissolves the old "welded glue" problem — every symbol the NLE components need is ADDED next to what the old engine still uses, so the engine components and the swaps can land as separate reviewable PRs. How: 15 authored intermediate files (main content + additive symbols; no behavior changes — new fields optional, new callbacks unused until wired) plus 6 files whose final content is already purely additive. New exports without consumers yet carry TEMP(studio-dnd) ignoreExports entries, removed by the app-shell swap. Test plan: tsc --noEmit in studio + studio-server (verifies BOTH engines compile); bunx vitest run (full suite green incl. the 6 new patchDocumentRootDuration tests); fallow audit clean.
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Continuation of closed #2205 after Graphite branch race; includes dead DomEditOverlay prop cleanup and duration parser fixes.