OnPageChangedEventTrigger
data class OnPageChangedEventTrigger(val direction: OnPageChangedEventTrigger.Direction) : EventTrigger
Fires on Pager/Carousel when the current page/item settles on a new one — once per matching direction per change, so wiring several directions runs several chains for the same page change. The initial page doesn't fire this. Carries the new page/item index (an Int) as incomingData — a mixed-content template like "Page: <||>" resolves against it directly.