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>

internal/web/view/account.go

@@ -92,6 +92,7 @@ func NewSettings(m Meta, retention, level1 string) *Settings {
 			Title:  "Settings",
 			Lead: Rich("What holds for the whole instance, whoever is signed in. Your own name, e-mail and password are under ",
 				Link("/account", "Account"), "."),
+			Actions: []Action{{Label: "Re-check DNS", Icon: "ti-refresh", Post: settingsDNSRecheck}},
 		},
 		Retention:     Box{No: "01", Title: "Log retention", Help: topicLink(HelpSettings, "How long rows are kept")},
 		RetentionDays: retention,
@@ -117,10 +118,18 @@ func (s *Settings) WithNotifications(on bool, from string) *Settings {
 	return s
 }
 
+// settingsDNSRecheck is where Re-check DNS on Settings posts.
+const settingsDNSRecheck = "/server/settings/dns-recheck"
+
 // WithMail sets the records of the server's own name, in the order they are
-// shown (ServerMailDKIM, ServerMailSPF).
-func (s *Settings) WithMail(records []Record) *Settings {
+// shown (ServerMailDKIM, ServerMailSPF), and how long ago they were checked
+// (FormatAge; "" when they were not).
+func (s *Settings) WithMail(records []Record, checked string) *Settings {
 	s.MailRecords = records
+	s.Mail.End = Plain("DNS records of the server's own name")
+	if checked != "" {
+		s.Mail.End = Plain("The server's own name · checked " + checked)
+	}
 	return s
 }