toTimeString method
Converts the duration to a formatted time string (MM:SS).
Example:
Duration(seconds: 75).toTimeString(); // "01:15"
Implementation
String toTimeString() {
int totalSeconds = inSeconds;
int minutes = totalSeconds ~/ 60;
int seconds = totalSeconds % 60;
return '${minutes.toString().padLeft(2, '0')}:'
'${seconds.toString().padLeft(2, '0')}';
}