panel-redesign: Help with seventeen topics; every box links to its own

Follows the design commit before it. Written by Sonnet, reviewed by
Opus.

  - view/help.go, templates/help.html: the mockup's topics, texts, ids
    and menu. The page shows the groups the reader's menu shows:
    Overview and Server for the global role, Outbound and Inbound by
    reach (Inbound only with the feature on), Account for everyone;
    boxes are numbered as shown.
  - Box.Help set on the boxes the mockups mark; the inbound MX box has
    its link again.
  - TestEveryHelpLinkLandsOnATopic also fails on a topic that no page
    links to, unless it is listed as menu-only (account) - and on a
    stale exception.

Known until the change that follows: the dns, dmarc and account topics
describe the three-choice report address, which the code does not have
yet; Account's DMARC box still links to #dns.

Not verified by running: three sentences rest on Postfix behaviour
(delivery is deferred when a required TLS session cannot be made; a
milter with default_action=tempfail answers 4xx; with "any recipient"
an address the upstream refuses comes back as a bounce).

Evidence
  - docs/assets/panel-redesign/evidence/help.png (1440x3600) and
    in-domain.png: headless Edge, real templates served locally with
    their fixtures - NOT from the container.
  - go test -count=1 ./internal/web/... ./cmd/panel: ok (six packages).

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

internal/web/view/outbound_log.go

@@ -104,7 +104,7 @@ func NewOutLog(m Meta, retentionDays int, canSettings bool, domains, apps []stri
 	return &OutLog{
 		Meta: m,
 		Head: Head{Kicker: "Outbound", Title: "Outbound log", Lead: lead},
-		Messages: Box{No: "01", Title: "Messages", Filter: &Filter{
+		Messages: Box{No: "01", Title: "Messages", Help: topicLink(HelpLog, "What the statuses mean"), Filter: &Filter{
 			Action: outboundLog,
 			Selects: []Select{
 				{Name: "domain", Label: "Domain", Options: options("All domains", domains), Selected: domain},
@@ -238,7 +238,7 @@ func NewOutMessage(m Meta, in MessageInput) *OutMessage {
 			{Label: "Queue id", Value: Plain(orDash(in.QueueID)), Mono: true},
 			{Label: "Journal id", Value: Plain(strconv.FormatInt(in.ID, 10)), Mono: true},
 		},
-		History:  Box{No: "02", Title: "History"},
+		History:  Box{No: "02", Title: "History", Help: topicLink(HelpLog, "What the statuses mean")},
 		Delivery: Box{No: "03", Title: "Delivery log", End: Rich("Lines from ", Code("mail.log"), " with this queue id")},
 		LogEmpty: EmptyState{Icon: "ti-file-text"},
 	}