notification-mail-recheck: Re-check DNS on Server › Settings

The owner, 2026-10-16: "Да, бери notification-mail-recheck". The records
of the server's own name can be checked again where they are shown: Re-
check DNS in Settings' page head (mockup 98e4dfc) posts to
POST /server/settings/dns-recheck (guard 52a9811), global role, which
runs Health's lookups - the server's address, then serverMail(true) - and
returns to /server/settings?rechecked=1, "DNS re-checked.". The
Notification mail box's end slot says when the records were checked
("The server's own name · checked 3 min ago", from the check's
CheckedAt; the old wording while nothing was looked up). A record that
has turned right comes back folded.

Tests: the page head's form and the end slot, and the Settings form
holding neither the re-check nor the right column
(TestSettingsRechecksTheMailRecords); the re-check skips the cache,
redirects and the page shows both records folded
(TestSettingsRecheckAsksForNotificationMailAgain); a domain
administrator gets 404 (globalOnlyRoutes). go vet + go test (26
packages) and make e2e on the test server for this tree.

Docs: architecture.md routes, the panel-redesign plan's route table,
guide § Settings, help (help.go word for word with the mockup's);
CHANGELOG [Unreleased]; roadmap row done. The roadmap's settings-save-row
note no longer claims the left-column form was needed for this - the
action went to the page head.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/plans/panel-redesign.md

@@ -182,7 +182,7 @@ list, an action under the thing it changes.
 | system-log | `GET /server/log` | `/system-log` |
 | backup | `GET, POST /server/backup` · `POST /server/backup/import` | `/backup` · `POST /domains/import` |
 | users · user · user-delete | `/server/users` · `…/new` · `…/{uid}` · `…/{uid}/delete` | `/users/…` |
-| settings | `GET, POST /server/settings` | the instance half of `/settings`: log retention, rate limits |
+| settings | `GET, POST /server/settings` · `POST …/dns-recheck` | the instance half of `/settings`: log retention, rate limits |
 | account | `GET /account` · `POST /account/profile`, `/password` | `/settings`: credentials and the DMARC default (today `/account` redirects there) |
 | help · components | `GET /help` · `GET /server/components` | `/help` · — |