loadSkyboxFromAsset method
Loads a skybox image from assetPath and applies it to model-viewer.
Reads the file from the Flutter asset bundle, encodes it as a base-64 data URI, and injects it into the page via JavaScript.
Returns true on success, false if the asset could not be loaded.
Implementation
Future<bool> loadSkyboxFromAsset(String assetPath) {
return _loadAssetAsAttribute(assetPath, 'skybox-image');
}