design: Sender check in the menu of Help

The topic was added with the Health card; its entry in the page's menu was
not. check.py: 0 violations, outlines unchanged.

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

docs/assets/panel-redesign/panel/src/help.html

@@ -20,6 +20,7 @@
           <ul class="menu-list">
             <li><a href="#dns"><i class="ti ti-world-check"></i>DNS records</a></li>
             <li><a href="#apps"><i class="ti ti-apps"></i>Applications</a></li>
+            <li><a href="#sender-check"><i class="ti ti-shield-check"></i>Sender check</a></li>
             <li><a href="#limits"><i class="ti ti-gauge"></i>Rate limits</a></li>
             <li><a href="#log"><i class="ti ti-list-details"></i>Outbound log</a></li>
             <li><a href="#queue"><i class="ti ti-stack-2"></i>Queue and retries</a></li>