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/ledger.html

@@ -37,7 +37,7 @@
     <div>InstantAdPay · <a href="/">how it works</a> · <a id="contractLink" href="#" target="_blank" rel="noopener">contract source ↗</a></div>
   </footer>
 </div>
-<script src="/assets/common.js?v=20260910c"></script>
+<script src="/assets/common.js?v=20260912b"></script>
 <script src="/assets/ledger.js?v=20260906m"></script>
 <script src="/assets/chat.js?v=20260906m"></script>
 </body>