Function friendlyError

dashboard/lcm/src/helpers.ts:110–116

(err: any)

 *  "Failed to fetch") when the server is unreachable. Failed fetches must
 *  render error UI, never zero-data UI, so this string is shown prominently. */
export function friendlyError(err: any): string {
  const raw = String((err && err.message) || err || "Request failed");
  if (/failed to fetch|networkerror|load failed|network request/i.test(raw)) {
    return "Can't reach the tracedecay server";
  }
  return raw;
}

/** Append rows from a paginated follow-up fetch, de-duplicated by id, so
 *  server-offset pagination can never double-render a row. */