/**
 * Convert a caught fetch error into a human-readable message.
 * TypeError means the request never left the client (no network / CORS / etc.).
 */
export function friendlyFetchError(err: unknown): string {
  if (err instanceof TypeError) {
    return "Could not connect to the server. Check your connection and try again.";
  }
  return err instanceof Error ? err.message : "An unexpected error occurred.";
}