[iOS] Fix handler retrieval and mismatched coordinate space (#4199)

## Description

Fixes three issues:
1. `findGestureHandlerByRecognizer` was relying on `reactTag` to
determine whether a view is managed by React Native. This is no longer
set on the new architecture (we do it
[here](https://github.com/software-mansion/react-native-gesture-handler/blob/e362f3a1ea2c04b78d3923c377dc2c62b23ca2d0/packages/react-native-gesture-handler/apple/RNGestureHandlerManager.mm#L206),
this needs to be investigated). Instead, I changed it to check whether
the view is a subclass of `RCTViewComponentView` which is a base for
Fabric components.
2. `shouldHandleTouch` in the button component was converting the point
to the wrong coordinate space when calling `wantsToHandleEventsAtPoint`.
3. `wantsToHandleEventsAtPoint` for api v3 was always trying to get the
child of the view the gesture is attached to. Correct when gesture is
attached to the detector, not when directly to view (virtual
detector/`wantsToAttachDirectlyToView: YES`).

## Test plan

Enable "Legacy examples" in the expo app and try to scroll, starting on
one of the disabled buttons.

|Before|After|
|-|-|
|<video
src="https://github.com/user-attachments/assets/28cd0b95-85df-46e8-8ca4-28c042d725b0"
/>|<video
src="https://github.com/user-attachments/assets/7116d3aa-557f-4828-9b4e-c0177ed89202"
/>|

There's no pointer captured, but in the "before" video, I'm trying to
scroll starting on `Nested buttons (sound & ripple)`.

Author: j-piasecki

packages/react-native-gesture-handler/apple/RNGestureHandler.mm

@@ -640,14 +640,14 @@ + (RNGestureHandler *)findGestureHandlerByRecognizer:(UIGestureRecognizer *)reco
   // We may try to extract "DummyGestureHandler" in case when "otherGestureRecognizer" belongs to
   // a native view being wrapped with "NativeViewGestureHandler"
   RNGHUIView *reactView = recognizer.view;
-  while (reactView != nil && reactView.reactTag == nil) {
-    reactView = reactView.superview;
-  }
-
-  for (UIGestureRecognizer *recognizer in reactView.gestureRecognizers) {
-    if ([recognizer isKindOfClass:[RNDummyGestureRecognizer class]]) {
-      return recognizer.gestureHandler;
+  while (reactView != nil) {
+    for (UIGestureRecognizer *recognizer in reactView.gestureRecognizers) {
+      if ([recognizer isKindOfClass:[RNDummyGestureRecognizer class]]) {
+        return recognizer.gestureHandler;
+      }
     }
+
+    reactView = reactView.superview;
   }
 
   return nil;
@@ -816,7 +816,8 @@ - (BOOL)wantsToHandleEventsAtPoint:(CGPoint)point
 
   RNGHUIView *viewToHitTest = _recognizer.view;
 
-  if ([self usesNativeOrVirtualDetector] && [_recognizer.view.subviews count] > 0) {
+  if ([self usesNativeOrVirtualDetector] && [_recognizer.view.subviews count] > 0 &&
+      _recognizer.view == self.hostDetectorView) {
     viewToHitTest = _recognizer.view.subviews[0];
     point = [_recognizer.view convertPoint:point toView:viewToHitTest];
   }

packages/react-native-gesture-handler/apple/RNGestureHandlerButton.mm

@@ -850,7 +850,7 @@ - (BOOL)shouldHandleTouch:(RNGHUIView *)view atPoint:(CGPoint)point
   for (UIGestureRecognizer *recognizer in enabledGestureRecognizers) {
     RNGestureHandler *handler = [RNGestureHandler findGestureHandlerByRecognizer:recognizer];
     if (handler != nil) {
-      CGPoint pointInView = [self convertPoint:point toView:view];
+      CGPoint pointInView = [self convertPoint:point toView:handler.recognizer.view];
       gestureRecognizerWantsEvent = [handler wantsToHandleEventsAtPoint:pointInView];
     } else {
       gestureRecognizerWantsEvent = YES;