Ad view: reliable exit on mobile/dApp browsers

window.close() is blocked in mobile and in-app wallet (dApp) browsers, which left
users stuck on the ad-view tab. Made "Back to dashboard" the primary action, and
"Close tab" now falls back to navigating to /my#earn when the browser refuses to
close the tab.

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

public/view.html

@@ -38,12 +38,12 @@
     <span class="vmsg" id="vMsg">Loading the ad…</span>
     <span class="vcheck" id="vCheck"><span class="prompt" id="vPrompt"></span><span id="vOpts"></span></span>
     <span class="vdone" id="vDone">
-      <button class="btn small" id="vClose" type="button">Close tab</button>
-      <a class="btn small sec" href="/my#earn">Back to dashboard</a>
+      <a class="btn small" href="/my#earn">Back to dashboard</a>
+      <button class="btn small sec" id="vClose" type="button">Close tab</button>
     </span>
   </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=20260906m"></script>
+<script src="/assets/view.js?v=20260908a"></script>
 </body>
 </html>