fmtDur function
Formats a Duration as "mm:ss" (minutes:seconds, each part 2 digits). Used for the reconnect countdown on Home / Level Select / World Map.
Implementation
String fmtDur(Duration d) {
final m = d.inMinutes.remainder(60).toString().padLeft(2, '0');
final s = d.inSeconds.remainder(60).toString().padLeft(2, '0');
return '$m:$s';
}