design: health-setup-checks - the greeting a row of its own, as Postfix writes it

The owner, 2026-10-16, on the mockup: "Может Greeting на всю ширину
карточки?" The facts grid gets sp-wide, a fact over the whole row (shown
on the kit page), and the greeting uses it. The greeting itself is what
this image's Postfix writes: "220 mail.example.org ESMTP"
(build/postfix-config.sh sets smtpd_banner to "$myhostname ESMTP"),
not Debian's longer default. The Configuration card's address sits in a
block of its own above the text. check.py: 0 violations.

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

docs/assets/panel-redesign/panel/components.html

@@ -197,6 +197,7 @@
               <div><dt>Label</dt><dd>Value</dd></div>
               <div><dt>Mono value</dt><dd class="sp-mono">4XcB7k2Jm9z1</dd></div>
               <div><dt>sp-big</dt><dd class="sp-big">5 days</dd><dd class="sp-muted">a supporting line</dd></div>
+              <div class="sp-wide"><dt>sp-wide</dt><dd class="sp-mono">a value that takes the whole row, a line of a server's own</dd></div>
             </dl>
           </div>
         </div>