- clipboard-sync: stop stale builds and duplicates, prefer the instance
started in the nested desktop, only start a new one when switching from
the nested desktop (an instance inherits the switching shell's session)
- vr-keyboard: the helper reverts the patch on SIGTERM (vrkbd-unpatch.js);
disabling the module stops the service via the new
steamFrame.userServices.stop, so the stock keyboard is back immediately
Portal fix, Steam-session keyboard layout, VR keyboard patch, hidden
apps, clipboard-sync and a Firefox Flatpak launcher, all under
steamFrame.*, plus the outer-session user-services mechanism.