Fix release APK build break in SwipeHelper

[Copilot]

The build-release-apk workflow was failing in :app:compileReleaseJavaWithJavac due to unresolved symbols introduced in the multi-touch swipe path. This change restores the missing two-finger gesture state used by the pinch/spread guard so release builds can compile again.

• Build failure root cause

  • Restore the missing p0 pointer reference in the two-finger swipe evaluation branch.
  • Replace the undefined pinch threshold identifier with a local constant used by the existing pinch/spread rejection logic.

• Swipe gesture path

  • Keep the two-finger pinch/spread filter behavior intact.
  • Limit the change to symbol restoration only; no gesture semantics or event mapping were otherwise altered.

private static final float PINCH_SPREAD_RATIO_THRESHOLD = 0.35F;

if (count == 2) {
    PointerInfo p0 = pointers.valueAt(0);
    PointerInfo p1 = pointers.valueAt(1);
    float startSpread = (float) Math.hypot(p0.startX - p1.startX, p0.startY - p1.startY);
    float endSpread   = (float) Math.hypot(p0.endX   - p1.endX,   p0.endY   - p1.endY);
    if (Math.abs(endSpread - startSpread) > PINCH_SPREAD_RATIO_THRESHOLD * meanDist) return;
}

[Copilot]

Pull request overview

This PR aims to unblock the build-release-apk GitHub Actions job by fixing a compile-time issue in the swipe gesture evaluation logic used by the app’s touch handling (the SwipeHelper that drives swipe-triggered relay/MQTT behavior).

Changes:

• Introduces a PINCH_SPREAD_RATIO_THRESHOLD constant to replace the previously missing/undefined pinch-spread threshold reference.
• Fixes the two-pointer pinch/spread rejection block by explicitly defining p0 before computing pointer spread deltas.
• Updates the related inline comment to reference the new constant name.

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