jumpToDayPicker method
Shows the day picker on the given date's month, or the current month if date is null.
Implementation
void jumpToDayPicker([DateTime? date]) {
final target = _clamp(start, switch (date) {
null => _currentMonth,
final m => .utc(m.year, m.month),
}, end);
if (day.controller.hasClients) {
day.jumpTo(target);
} else {
_reattach(day, .day, target);
}
}