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hyperframes/packages
Vance Ingalls fc70d5f331 fix(studio): guard slider release reentrancy, scope Grade persist to schedule-time callback
Fixes the four blockers from the #2416 re-review at head d6a40c38b:

- FlatSlider's onPointerUp calls releasePointerCapture() explicitly, which
  fires lostpointercapture SYNCHRONOUSLY in real browsers — the prior
  unconditional onLostPointerCapture resync ran mid-onPointerUp, flipping
  draggingRef false before onPointerUp's own check, silently dropping every
  normal drag-release's final commitDraft(). happy-dom doesn't replicate the
  synchronous cascade, so this shipped without a failing test. Added an
  explicitReleaseRef flag set right before each deliberate
  releasePointerCapture() call so onLostPointerCapture can tell "our own
  release, caller's logic already handles it" apart from a genuine external
  capture loss. Added a regression test that monkey-patches
  releasePointerCapture to reproduce the real-browser ordering.

- persistColorGradingValue read onSetAttributeLiveRef.current (reassigned
  every render) instead of the callback live when the debounced edit was
  scheduled — a timer for element A firing after a re-render for element B
  would wrongly call B's callback with A's data. Removed the ref; the
  callback is now an explicit parameter captured by commitColorGrading's own
  closure (added to its useCallback deps) and threaded through to
  persistColorGradingValue and flushPendingPersist.

- flushPendingPersist passed () => true as its isLatestAttempt checker,
  bypassing the per-commit version guard entirely. Now calls
  bumpDomEditCommitVersion(gradingVersionRef) like a regular debounced
  commit, so a newer edit landing before the flushed write settles still
  wins the race.

- The selection-identity cleanup effect stopped clearing statusTimersRef
  during an earlier refactor — stale RUNTIME_STATUS_REFRESH_DELAYS timers
  for an outgoing element could fire after switching selection and stamp
  the new element's runtimeStatus with the old element's answer. Restored
  the clear in the same effect cleanup.

Also gave the Custom LUT and "Copy grade to" scope <select> controls
aria-labels — both had their visible text in a sibling span/text node, so
neither had an accessible name.

Full studio suite still at the known pre-existing 55-failure baseline
(variablePromoteIntegration, useGsapPropertyDebounce, sdkCutover(Parity),
sdkResolverShadow), zero new regressions. Typecheck, oxlint, oxfmt clean.
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