[iOS] Handle FullWindowOverlay as the native root

[j-piasecki]

Description

Current logic dedicated to handling RNRootViewGestureRecognizer on iOS looks only for RN's native roots. When gestures are used inside Screens' FullWindowOverlay, the logic doesn't do anything, but the overlay has its own RCTSurfaceTouchHandler.

This PR updates the traversal logic so it handles RNSFullWindowOverlayContainer the same way as RCTSurfaceView.

Test plan

I wasn't able to reproduce the problem, but in theory, it's possible that without this change, recognizers from RNGH and RCTSurfaceTouchHandler could run simultaneously, since this path never ran:

react-native-gesture-handler/packages/react-native-gesture-handler/apple/RNRootViewGestureRecognizer.m

Lines 55 to 63 in 5587435

	// When this method is called it means that one of handlers has activated, in this case we want
	// to send an info to JS so that it cancells all JS responders, as long as the preventing
	// recognizer is from Gesture Handler, otherwise we might break some interactions
	RNGestureHandler *handler = [RNGestureHandler findGestureHandlerByRecognizer:preventingGestureRecognizer];
	if (handler != nil) {
	[self.delegate gestureRecognizer:preventingGestureRecognizer didActivateInViewWithTouchHandler:self.view];
	}
	return [super canBePreventedByGestureRecognizer:preventingGestureRecognizer];

[Copilot]

Pull request overview

Updates iOS root-view traversal in RNGestureHandlerManager so RNGH can treat Screens’ FullWindowOverlay container as a native root (similar to RCTSurfaceView), enabling the RNRootViewGestureRecognizer path to run in that hierarchy.

Changes:

• Adds a runtime check for RNSFullWindowOverlayContainer via NSClassFromString.
• Extends the superview traversal stop-condition to stop at either RCTSurfaceView or RNSFullWindowOverlayContainer.

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[WoLewicki]

lgtm