/**
 * Extract a human-readable message from an unknown error value.
 *
 * Use this in every `catch (e: unknown)` block instead of accessing
 * `e?.message` directly — TypeScript's `unknown` type prevents property
 * access without a type guard.
 */
export function getErrorMessage(e: unknown, fallback = "An unexpected error occurred"): string {
  return e instanceof Error ? e.message : fallback;
}