A bedtime before noon now belongs to the evening before, so Sunday to
Thursday nights at 00:30 run early Monday to early Friday, not Saturday
night through Wednesday night. Turning bedtime off clears the "last
applied" state only once the rule is really gone, so a refused removal
is retried instead of leaving Do Not Disturb on. Reopening the screen
after granting access elsewhere creates the rule even if the system's
broadcast never arrived. The empty-mask rule lives in one place.
Refs #1