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Ular Kimsanov
3930460c51
* feat(studio): timeline leaf helpers — audio inspector, zoom math, UI prefs What: extends three leaf modules to their final NLE-stack form, tests in the same change: timelineInspector (isAudioTimelineElement, resolveBeatSourceTrack), timelineZoom (zoom/pps math incl. computePinnedZoomPercent), and studioUiPreferences (persisted editor prefs). Why: leaf dependencies of the NLE timeline stack; landing them first keeps the later glue PRs to wiring. How: additive from the consumer side — every export main already uses is unchanged (typecheck against main's consumers passes untouched); every new export is exercised by a test in this PR. Test plan: bunx vitest run on the three test files; tsc --noEmit in packages/studio; fallow audit --base origin/main clean. * feat(studio): seek-restore contract for player reloads What: useTimelineSyncCallbacks gains resolveReloadSeekTime and revealIframe — the pure contract for where the playhead lands after a preview reload (pending seek > deep-link seek > store playhead, clamped) and for undoing refreshPlayer's iframe hide. Test suite included. Why: the NLE editor reloads the preview on every committed edit; this contract is the difference between "playhead restores" and "jumps to 0". How: additive exports on an existing hook file; main's consumers unchanged. Test plan: bunx vitest run useTimelineSyncCallbacks.test.ts; tsc --noEmit in packages/studio; fallow audit clean.