Round 3's correctness/security pass came back clean; what was left said more than
the code does.
- emailOff promised the access-request list is where sign-ups show up. A sign-up
on an address that is already approved or already pending adds nothing to it
(roadmap UX-25), and "only" was falsified by this release's own inbox notice.
- deleteConfirm claimed the admin was dropping "an approval you already gave" —
it is the confirmation for pending and denied rows too.
- sendFailed blamed the mail server for rejecting a message; the reason covers
connect, DNS, TLS and login failures alike, so it now describes the symptom and
leaves the diagnosis to the log.
- ADMIN_EMAILS re-promotion happens in the Google callback only, not on any
sign-in.
Tests: the decided-list copy of the delete affordance was never rendered (both
new cases fail if that branch is dropped), and the throttle release — a
deliberate behaviour the notes advertise — was asserted by nothing; a drop with
no admin yet, or with a failing write, must not silence the following hour.