Fix macOS transform anchor point compensation in updateLayoutMetrics

The updateLayoutMetrics code path re-applies the transform when the view
size changes, but was missing the macOS anchor point compensation that
adjusts for CALayer.anchorPoint being {0,0} instead of {0.5,0.5}. This
caused the correctly compensated transform from updateProps to be
overwritten with an uncompensated one on every layout change.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Saadnajmi

packages/react-native/React/Fabric/Mounting/ComponentViews/View/RCTViewComponentView.mm

@@ -718,7 +718,16 @@ - (void)updateLayoutMetrics:(const LayoutMetrics &)layoutMetrics
   if ((_props->transformOrigin.isSet() || _props->transform.operations.size() > 0) &&
       layoutMetrics.frame.size != oldLayoutMetrics.frame.size) {
     auto newTransform = _props->resolveTransform(layoutMetrics);
-    self.layer.transform = RCTCATransform3DFromTransformMatrix(newTransform);
+    CATransform3D caTransform = RCTCATransform3DFromTransformMatrix(newTransform);
+#if TARGET_OS_OSX // [macOS
+    CGPoint anchorPoint = self.layer.anchorPoint;
+    if (CGPointEqualToPoint(anchorPoint, CGPointZero) && !CATransform3DEqualToTransform(caTransform, CATransform3DIdentity)) {
+      // This compensates for the fact that layer.anchorPoint is {0, 0} instead of {0.5, 0.5} on macOS for some reason.
+      CATransform3D originAdjust = CATransform3DTranslate(CATransform3DIdentity, self.frame.size.width / 2, self.frame.size.height / 2, 0);
+      caTransform = CATransform3DConcat(CATransform3DConcat(CATransform3DInvert(originAdjust), caTransform), originAdjust);
+    }
+#endif // macOS]
+    self.layer.transform = caTransform;
   }
 }