[Image] errorSource not working on Android due to undefined nativeEvent.error + zIndex:-1 causes visibility issues

The Image component in react-native-ui-lib has two related issues on Android:

1. errorSource does not load when image fails
   On Android, onError callback receives an event where event.nativeEvent.error is undefined. As a result, the component cannot detect a real error and fallback to errorSource.
   The Avatar (and similarly, Image) component in react-native-ui-lib has issues on Android:

2. Image may be hidden due to zIndex: -1
   When using certain props (e.g., useBackgroundContainer or internal styling), the image gets zIndex: -1, causing it to be visually hidden behind other elements.

Both issues severely impact reliability and accessibility of image loading on Android.

react-native : 0.77.1
react-native-ui-lib : 7.43.0

Start at the Image and Avatar components, reproducing failed Android image loads with errorSource and visibility issues involving useBackgroundContainer or internal styling. Done means errorSource renders when nativeEvent.error is undefined and the image remains visible under the affected props; no specific file or test is named in the issue.