Variable
ConstShown by the lesson page once the ticket notification has left, when that completion collected the module's last ticket. The prize stays a silhouette on purpose: the reveal belongs to the counter, where the learner claims it, so the walk there is worth taking.
Its promise settles with undefined on every way out — Keep learning, the
close control, Escape — and focus returns to the control that had it, since
there is no DialogTrigger for Radix to refocus.
Tells the learner a prize is waiting for them at the counter, without showing which one.