The repeat-day settle ran on the editor's scope, so leaving mid-settle
needed a flush that a cleared scope could still race. The announcer now
owns the settle on the application scope. Screens show the notice only
while resumed, so a cross-fade never shows it twice and a backgrounded
app does not use it up unseen. The editor shows only notices about its
own alarm, since the sentence names none.
Deleting an alarm, or the AlarmClock chooser dismissing it, takes its
notice back. Freshness is measured on the monotonic clock, one instant
is used for both ends of the countdown, and an identical countdown
keeps the standing notice instead of flickering it.
Refs #19
makiolaj
fa5ce55503