[🐴] Finalize web message screen (#3868)

* 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`

* remove unnecessary wrapper

* add style

* oops

* maintain position for web

* always apply `flex: 1` to styles when contained

* add a contained list to storybook

* make `onScroll` a worklet in storybook

* revert test code

* remove unnecessary `flex: 1`

src/view/com/util/List.web.tsx

@@ -143,6 +143,7 @@ function ListImpl<ItemT>(
         scrollToTop() {
           getScrollableNode()?.scrollTo({top: 0})
         },
+
         scrollToOffset({
           animated,
           offset,