Fix What's New dialog layout and improve dev styling/debugging.

Portal the updates dialog to document.body with stable data attributes,
fix max-width (invalid S800 token), bundle update images for Capacitor,
and add readable vanilla-extract class names plus portalContainer tap fixes.

index.html

@@ -96,12 +96,6 @@
     </script>
     <div id="root"></div>
     <div id="portalContainer"></div>
-    <style>
-      #portalContainer {
-        position: relative;
-        z-index: 10000;
-      }
-    </style>
     <script type="module" src="./src/index.tsx"></script>
   </body>
 </html>