It would be great to have some backgrounds that are interactive just with the mousemove events, for example this demo or this one. Or even this one but with the mousemove instead of click.
The mosemove interaction would work always, even when not in browsing mode.
Investigate how Plash currently handles mouse events in browsing mode versus non browsing mode. Look at the existing event forwarding mechanism from the web view (WKWebView) to the app. Consider whether the web view needs to be configured to allow mousemove events even when not in browsing mode, or if the app needs to capture these events from the web view's JavaScript and relay them to the desktop rendering. Check any related discussions in the issue comments or linked demos for implementation clues.
