Discard measured responder region that excludes the grant touch

[joeltjames]

Summary:

Fixes #57502.

Pressability measures the responder view on grant and, on every touchMove, cancels the press if the touch is outside the measured rect. On Fabric, measure() answers from the shadow tree — so when a view has been repositioned by native code after layout (e.g. @lodev09/react-native-true-sheet pins its footer slot to the sheet bottom with AutoLayout — lodev09/react-native-true-sheet#726), the measured rect can be hundreds of points away from where the view actually is. A button that natively hit-tested and granted the responder then shows press feedback (onPressIn) but never fires onPress: the first move event deactivates the press via LEAVE_PRESS_RECT.

The failure is invisible in development: stationary simulator taps emit zero move events (the check never runs), and newer device/OS combos coalesce micro-jitter moves away. On older physical hardware (tested iPhone XS-class, iOS 16/18), every real-finger tap emits at least one move event — even zero-delta — and the press silently dies.

This PR validates the measurement against the press itself: the responder was granted by a native hit test, so the grant touch necessarily lies inside the view's true on-screen region. If the async-measured region excludes the grant point, the measurement is provably stale — discard it. A null region already means "skip press-rect checks" (that state exists today whenever measure hasn't completed), and correct measurements are unaffected since they contain the grant point by construction. Precedent: _measureCallback already discards all-zero measurements.

Found while working on the Planning Center mobile app; diagnosed and fixed with the help of Claude (Fable). The identical patch is running in production and verified on the previously-failing devices.

Changelog:

[GENERAL] [FIXED] - Pressability no longer cancels presses using a stale measured region that does not contain the touch that granted the responder

Test Plan:

• Added two Jest tests in Pressability-test.js:
  • onPress fires when the measured region excludes the grant touch (press granted at page (276, 467) with the mock region at (0, 0, 50, 50) — models a natively repositioned view; previously the first move deactivated the press).
  • onPress still does not fire when a valid measurement contains the grant touch and the finger then leaves the region — confirming slide-off-to-cancel is unchanged.
• Verified on device: with this patch applied (via yarn patch on RN 0.83.6) in the Planning Center app, sheet-footer buttons fire correctly on physical iPhones running iOS 16/18, and slide-off-to-cancel still works on correctly-measured buttons.

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