Every write re-read the engine and re-worded a standing announcement,
so tapping Mon-Fri while the snackbar showed restarted it on each tap,
as did a label keystroke across a minute. The words now come from the
first read; later writes can only take the snackbar down, when the
alarm stops ringing. The settled announcement still replaces it once.
Deleting no longer retracts by hand: a deleted alarm already reads as
nothing to say.
Refs #19
makiolaj
706a384704