Debug touch feedback can crash when native touches array is shorter than gesture count

[thomasttvo]

Summary

PR #152 review flagged a pre-existing debug-mode crash: the pinch debug path reads both touch entries without checking the actual native touch array length. I checked current master and PR #165 (thomas/pre-existing-fixes-v2), and both still have the same unguarded access.

Source review thread: #152 (comment)

Current code

Both origin/master and PR #165 still do:

const { touches } = gestureResponderEvent.nativeEvent;

setDebugPoints([
  {
    x: touches[0].pageX - originalPageX,
    y: touches[0].pageY - originalPageY,
  },
  {
    x: touches[1].pageX - originalPageX,
    y: touches[1].pageY - originalPageY,
  },
  zoomCenter,
  ...points,
]);

Impact

This is limited to debug mode (debug={true}), but a gesture event where gestureState.numberActiveTouches === 2 while nativeEvent.touches.length < 2 can throw TypeError: Cannot read properties of undefined and terminate the gesture/debug session.

Suggested fix

Guard before reading touch entries:

if (touches.length < 2) return;

Then keep the existing setDebugPoints behavior for valid two-touch events.

Triage note

This is not covered by PR #165 or current master as of PR #152 HEAD 5fee673 / PR #165 HEAD c2796dc.