Join page names the owner of the link it was opened with, and tells a member when they are previewing their own page

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

public/assets/join.js

@@ -88,10 +88,11 @@
 
   // sponsor line (the link opened most recently sets the sponsor; it locks at account creation)
   let sponsorName = '';
-  fetch('/api/sponsor').then(r => r.json()).then(sp => {
+  const linkTok = (location.pathname.match(/^\/join\/([^/?#]+)/) || [])[1] || '';
+  fetch('/api/sponsor' + (linkTok ? '?ref=' + encodeURIComponent(linkTok) : '')).then(r => r.json()).then(sp => {
     if (sp && sp.invited && sp.name) {
       sponsorName = sp.name;
-      $('jnSponName').textContent = sp.name;
+      $('jnSponName').textContent = sp.name + (sp.own ? ' (this is your own invite page; visitors see your name here)' : '');
       if (sp.avatarUrl) { $('jnSponImg').src = sp.avatarUrl; $('jnSponImg').hidden = false; }
       $('jnSpon').hidden = false;
     }

public/join.html

@@ -157,6 +157,6 @@
   </div>
 </div>
 <script src="/assets/common.js?v=20260913a"></script>
-<script src="/assets/join.js?v=20260912d"></script>
+<script src="/assets/join.js?v=20260913a"></script>
 </body>
 </html>