/**
 * Time formatting utilities.
 */
/**
 * Format elapsed time in milliseconds.
 *
 * Rules:
 * - < 60s → "Xs"
 * - < 60m → "Xm Ys"
 * - ≥ 60m → "Xh Ym"
 */
export declare function formatElapsed(ms: number): string;
/**
 * Format relative time from an ISO date string to now.
 */
export declare function formatRelativeTime(isoDate: string): string;