The dormancy notification's "will be automatically deleted in X"
sentence rendered the dormancy threshold instead of the auto-delete
duration. A 30-day threshold rendered as "4 weeks" even when auto-delete
was 90 days; a 60-day threshold rendered as "1 month" with a 7-day
auto-delete. Render the countdown from the auto-delete setting, and skip
the deletion sentence entirely when auto-delete is disabled so the
notification no longer promises a deletion that will never happen.