small fixes

- paginator shows correctly past - now - future
- uselayouteffect in pip
- scroll into view would crash if event was deleted

client/src/features/editors/list/EventList.jsx

@@ -77,6 +77,7 @@ export default function EventList(props) {
 
   // when cursor moves, view should follow
   useEffect(() => {
+    if (cursorRef.current == null) return;
     cursorRef.current.scrollIntoView({
       behavior: 'smooth',
       block: 'nearest',