* add `onStartReached` to web list * fix `rootMargin` * Add `contain`, handle scroll events * improve types, fix typo * simplify * adjust `scrollToTop` and `scrollToOffset` to support `contain`, add `scrollToEnd` * rename `handleWindowScroll` to `handleScroll` * support basic `maintainVisibleContentPosition` * rename `contain` to `containWeb` * remove unnecessary `flex: 1` * add missing props * add root prop to `Visibility` * add root prop to `Visibility` * revert adding `maintainVisibleContentPosition` * oops * always apply `flex: 1` to styles when contained * add a contained list to storybook * make `onScroll` a worklet in storybook * revert test code * add scrolling to storybook * simplify getting scrollable node * nit: extra whitespace * nit: random comment * foolproof the logic * typecheck