sanitizeURL(uri) {
      return this._load('sanitizeURL', uri);
    }
Sanitize a URL to include as a hyperlink in the rendered scene.
This method proxies a call to ImageLoader.sanitizeURL, but also tracks
image loading progress and invokes a re-render once complete.
@param {string} uri - The URI string to sanitize.
@return {Promise} - A Promise that resolves to the sanitized URL.