fix: macOS UIImage build issues (#2862)

# Summary

Really simple change to get skia running on macOS, I noticed this while
testing BareExpo in the expo/expo repo. Just add a `!TARGET_OS_OSX`
check and use `NSImage`

## Test Plan

Run fabric-macos-example on macOS

<img width="1392" height="864" alt="image"
src="https://github.com/user-attachments/assets/199d860b-7722-4afd-90a7-9741d8fe9034"
/>


## Compatibility

| OS      | Implemented |
| ------- | :---------: | 
| MacOS   |    ✅      | 

## Checklist

<!-- Check completed item, when applicable, via: [X] -->

- [x] I have tested this on a device and a simulator
- [ ] I added documentation in `README.md`
- [ ] I updated the typed files (typescript)
- [ ] I added a test for the API in the `__tests__` folder

---------

Co-authored-by: Jakub Grzywacz <[email protected]>

Author: gabrieldonadel

apple/Elements/RNSVGImage.mm

@@ -130,8 +130,11 @@ - (void)_setStateAndResubscribeImageResponseObserver:(RNSVGImageShadowNode::Conc
 }
 
 #pragma mark - RCTImageResponseDelegate
-
+#if !TARGET_OS_OSX // [macOS]
 - (void)didReceiveImage:(UIImage *)image metadata:(id)metadata fromObserver:(void const *)observer
+#else // [macOS
+- (void)didReceiveImage:(NSImage *)image metadata:(id)metadata fromObserver:(void const *)observer
+#endif // macOS]
 {
   if (!_eventEmitter || !_state) {
     // Notifications are delivered asynchronously and might arrive after the view is already recycled.
@@ -233,7 +236,11 @@ - (void)setSrc:(RCTImageSource *)src
 
   _reloadImageCancellationBlock = [[self.bridge moduleForName:@"ImageLoader"]
       loadImageWithURLRequest:src.request
+#if !TARGET_OS_OSX // [macOS]
                      callback:^(__unused NSError *error, UIImage *image) {
+#else // [macOS
+                     callback:^(__unused NSError *error, NSImage *image) {
+#endif // macOS]
                        dispatch_async(dispatch_get_main_queue(), ^{
                          self->_image = CGImageRetain(image.CGImage);
                          self->_imageSize = CGSizeMake(CGImageGetWidth(self->_image), CGImageGetHeight(self->_image));