The base WidgetDriver throws Failed to override function for these
methods. ClientWidgetApi routes update_delayed_event widget actions to
cancelScheduledDelayedEvent, restartScheduledDelayedEvent, or
sendScheduledDelayedEvent. Without these overrides every delayed-event
refresh from element-call fails, causing MembershipManager to drop the
call after retries.
Also make listenAction auto-call preventDefault so io.element.join and
other custom widget actions return success. Add set_always_on_screen
handler so element-call PiP requests are acknowledged.