Ad viewing: full-screen in-page overlay instead of a new tab

Mobile and in-app wallet (dApp) browsers handle tabs badly, so opening each ad in
a new tab made the earn loop hard to navigate and impossible to close. Ads now
open in a full-screen in-page overlay that reuses the /view dwell + human-check +
credit logic in an iframe: an always-working close control, no window.close, no
tab-switching. The framed /view relaxes its focus-pause to visibility only and
messages the dashboard when it credits or the user is done.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

public/view.html

@@ -44,6 +44,6 @@
   </div>
   <iframe class="vframe" id="vFrame" sandbox="allow-scripts allow-same-origin allow-forms allow-popups" referrerpolicy="no-referrer" title="Advertiser site"></iframe>
 </div>
-<script src="/assets/view.js?v=20260908a"></script>
+<script src="/assets/view.js?v=20260908b"></script>
 </body>
 </html>