Member area: in-page dialogs replace every browser prompt/confirm

Mobile Safari shows a red 'Suppress dialogs' option on the second native pop-up
in a row and, once tapped, swallows every later prompt on the site until reload
(Hugh, 2026-09-12, campaign top-up). IAP.ask / IAP.confirmBox in common.js render
a modal-card dialog (Enter/Escape, focus, backdrop cancel); all nine call sites in
my.js use them (top-up credits, link insert x2 with selection restore, pay it
forward, adopt note, release, unlink, add position, Trust Wallet check).
Version tags bumped on every page that loads common.js.

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

public/wall.html

@@ -47,7 +47,7 @@
     </div>
   </div>
 </section>
-<script src="/assets/common.js?v=20260910c"></script>
+<script src="/assets/common.js?v=20260912b"></script>
 <script src="/assets/wall.js?v=20260911v"></script>
 </body>
 </html>