[iOS] Stack overflow in _UIHostingView._hitTest with keyboard open on a page (8.0.2 and 9.0.4, New Architecture)

## Summary

On iOS the app crashes with `EXC_BAD_ACCESS` / **stack overflow** inside `_UIHostingView._hitTest` while a page of `PagerView` has the software keyboard open (or has just dismissed it). The main thread shows ~70 consecutive `_UIHostingView._hitTest` frames (the trace is trimmed to 100 frames, so the real depth is larger) before it reaches the React Native hit-test path and runs out of stack.

It happens with **8.0.2** and with **9.0.4** (same stack), so none of the 8.0.3–9.0.4 changes (page wrapper as `UIViewControllerRepresentable`, `ignoresSafeArea`, hosting-controller reparenting in 9.0.2, `setPage` fix in 9.0.4) address it. 6.x (UIKit `UIPageViewController`) never crashed here.

Over the last 30 days: **27 crashes from 17 distinct users**, roughly every fourth user who reached that page. Users relaunch and crash again on the same page (up to 3 times in 3 minutes). Not reproducible in the simulator so far, only on devices.

## Environment

- react-native-pager-view **9.0.4** (also 8.0.2), Expo SDK 57, React Native **0.86.2**, React 19.2.3, **New Architecture (Fabric) enabled**, Hermes
- react-native-gesture-handler 2.32.x (buttons come from `pressto`'s `PressableScale`), react-native-keyboard-controller 1.21.9, react-native-screens 4.26, react-native-reanimated 4.5.1, react-native-safe-area-context 5.7
- iOS deployment target 16.4; crashes seen on iOS 26.1 – 26.6.1 (24 events) and iOS 18.7.7 / 18.7.8 (3 events)
- Devices: iPhone 14 Pro … iPhone 18 (iPhone14,2, 15,2, 15,3, 16,1, 16,2, 17,2, 17,3, 18,1, 18,2), iPad15,3 and iPad15,7 running the iPhone build
- App Store builds, production, breadcrumbs show `RNSScreen` → `UIHostingController` → `IntrospectionAnchorPlatformViewController` / `IntrospectionPlatformViewController`

## Setup that crashes

- `PagerView` with `scrollEnabled={false}` (pages are switched only via `ref.setPage`), 14 pages, all mounted (onboarding flow inside a `react-native-screens` native stack).
- One page contains a `TextInput` with `autoFocus` inside `KeyboardAwareScrollView` from react-native-keyboard-controller, plus a few RNGH-backed buttons (`pressto` → `RNGestureHandlerButton`).
- Sequence from breadcrumbs: page appears → keyboard shows (`UIKeyboardDidShowNotification`) → user types → taps a button → keyboard hides → taps the primary button → crash ~2 s later. Other events crash while the keyboard is still up.

## Crash (thread 0, from Sentry, oldest frame first)

```
_UIHostingView._hitTest ← repeated ~70 times (trimmed)
…
_UIHostingView._hitTest
ViewResponder.hitTest
ViewResponder.hitTest
MultiViewResponder.containsGlobalPoints
UIViewResponder.containsGlobalPoints
PlatformViewResponderBase.containsGlobalPoints
UIViewResponder.platformViewHitTest
-[UIView(Geometry) hitTest:withEvent:]
-[__NSSingleObjectArrayI enumerateObjectsWithOptions:usingBlock:]
__38-[UIView hitTest:withEvent:]_block_invoke
-[UIView(Geometry) _hitTest:withEvent:windowServerHitTestWindow:]
-[UIView(Geometry) hitTest:withEvent:]
-[__NSSingleObjectArrayI enumerateObjectsWithOptions:usingBlock:]
__38-[UIView hitTest:withEvent:]_block_invoke
-[UIView(Geometry) _hitTest:withEvent:windowServerHitTestWindow:]
-[RCTViewComponentView hitTest:withEvent:]
-[RCTViewComponentView betterHitTest:withEvent:]
-[RCTViewComponentView hitTest:withEvent:]
-[RCTViewComponentView betterHitTest:withEvent:]
-[RNGestureHandlerButtonComponentView hitTest:withEvent:] (RNGestureHandlerButtonComponentView.mm:270)
-[RNGestureHandlerButton hitTest:withEvent:] (RNGestureHandlerButton.mm:121)
-[RNGestureHandlerButton shouldHandleTouch:] (RNGestureHandlerButton.mm:75)
+[NSPredicate predicateWithFormat:]
+[NSPredicate predicateWithFormat:arguments:]
_qfqp2_performParsing
_qfqp2lex
strdup ← EXC_BAD_ACCESS, "Stack overflow in (null)"
```

Sentry title: `EXC_BAD_ACCESS: isEnabled > Stack overflow in (null)`, mechanism `mach`, `handled: no`. Older 8.0.2 events (same stack) were symbolicated to `facebook::react::concreteComponentDescriptorConstructor` as culprit, which is just where the stack ran out.

## What we tried

- 8.0.2 → 9.0.4: no change.
- Replacing `PagerView` with a plain `ScrollView`-based pager (`pagingEnabled`, `scrollEnabled={false}`, `scrollTo`) removes the crash entirely, which points at the SwiftUI hosting layer rather than at our page content.

## Question

Is the SwiftUI `TabView`/hosting-view hit-test recursion with the keyboard open a known issue for v8/v9? Happy to provide full Sentry events (all threads) or test a build with extra logging on the affected devices.

Start by reproducing the provided PagerView and keyboard sequence on an affected physical iOS device, then inspect the Sentry hit-test trace. Compare the SwiftUI hosting path with the plain ScrollView-based pager and review RNGestureHandlerButton.mm at lines 75, 121, and 270. Done means establishing whether the v8/v9 hosting layer causes the recursion and documenting a tested fix or mitigation.

Written by the indexing model from the issue text.