Account page: add Settings link

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

app/public/dashboard-account.html

@@ -72,6 +72,7 @@ dialog .row { display: flex; gap: 0.5rem; justify-content: flex-end; margin-top:
   <div><h1>Account</h1><div class="sub" id="whoami">Loading…</div></div>
   <div class="header-right">
     <a href="/dashboard" class="nav-link">← Dashboard</a>
+    <a href="/dashboard/settings" class="nav-link">Settings</a>
     <a href="/dashboard/logout" class="nav-link">Sign out</a>
   </div>
 </div>