formatTimeAgo function
Implementation
String formatTimeAgo(int timestamp) {
final seconds = (DateTime.now().millisecondsSinceEpoch - timestamp) ~/ 1000;
if (seconds < 60) return '${seconds}s ago';
final minutes = seconds ~/ 60;
if (minutes < 60) return '${minutes}m ago';
return '${minutes ~/ 60}h ago';
}