The settings screen Android's screen saver list opens gets a task of its
own and stays out of recents, so it never lands in or clears the app's
task, and its bars follow the app's theme. The on-demand screen saver is
noHistory, so leaving it by Home does not bring the app back to it later,
and it only touches the keep-screen-on flag when charging starts or stops.
The next-alarm line uses the same 12/24-hour rule as the big readout,
joined to the day by a translatable string; the minute's crossfade shows
the old minute fading out rather than two copies of the new one.