/**
 * Formats a timestamp into a human-readable age string (e.g., "3h" or "2d5h")
 * 
 * @param timestamp - ISO 8601 timestamp string
 * @returns Formatted age string
 */
export function formatAge(timestamp: string): string {
    const created = new Date(timestamp);
    const now = new Date();
    const diffHours = Math.floor((now.getTime() - created.getTime()) / (1000 * 60 * 60));
    if (diffHours < 24) {
      return `${diffHours}h`;
    }
    const diffDays = Math.floor(diffHours / 24);
    return `${diffDays}d${diffHours % 24}h`;
}