/// Joins an API media path with [baseUrl].
///
/// Uploaded photos come back as relative paths (`/storage/...`).
/// Default avatars are already absolute (`https://ui-avatars...`) and must stay as-is.
String joinBaseUrl(String baseUrl, String path) {
  final normalized = path.toLowerCase();
  if (normalized.startsWith('https://') || normalized.startsWith('http://')) {
    return path;
  }
  return '$baseUrl$path';
}