Add clipboard permissions to desktop app iframe sandbox

Add allow-clipboard-read and allow-clipboard-write to enable
Cmd+C/Cmd+V shortcuts in the Mac desktop app.

Author: knowsuchagency

desktop/resources/index.html

@@ -309,7 +309,7 @@
     </div>
   </div>
 
-  <iframe id="vibora-frame" sandbox="allow-same-origin allow-scripts allow-forms allow-popups allow-popups-to-escape-sandbox allow-modals allow-downloads"></iframe>
+  <iframe id="vibora-frame" sandbox="allow-same-origin allow-scripts allow-forms allow-popups allow-popups-to-escape-sandbox allow-modals allow-downloads allow-clipboard-read allow-clipboard-write"></iframe>
 
   <div id="zoom-trigger"></div>
   <div id="zoom-controls">