Fix invertase#2698: Build fails when targeting Mac (Project Catalyst)

The Catalyst SDK does not support `assets-library://` URLs, which have been deprecated for many years. This patch fixes the build failure when compiling with the Catalyst SDK; requests for such assets will fail and log (the first time).

packages/app/ios/RNFBApp/RNFBUtilsModule.m

@@ -57,7 +57,16 @@ + (PHAsset *)fetchAssetForPath:(NSString *)localFilePath {
   if ([localFilePath hasPrefix:@"assets-library://"] || [localFilePath hasPrefix:@"ph://"]) {
     if ([localFilePath hasPrefix:@"assets-library://"]) {
       NSURL *localFile = [[NSURL alloc] initWithString:localFilePath];
+#if TARGET_OS_MACCATALYST
+      static BOOL hasWarned = NO;
+      if (!hasWarned) {
+          NSLog(@"assets-library:// URLs are not supported in Catalyst-based targets; returning nil (future warnings will be suppressed)");
+          hasWarned = YES;
+      }
+      asset = nil;
+#else
       asset = [[PHAsset fetchAssetsWithALAssetURLs:@[localFile] options:nil] firstObject];
+#endif
     } else {
       NSString *assetId = [localFilePath substringFromIndex:@"ph://".length];
       asset = [[PHAsset fetchAssetsWithLocalIdentifiers:@[assetId] options:nil] firstObject];
@@ -91,4 +100,4 @@ - (NSDictionary *)constantsToExport {
   return constants;
 }
 
-@end
+@end