fix(examples): use layoutEffect ref for scrollMargin in window example

[isaackaara]

The window example reads listRef.current?.offsetTop directly during render, which triggers the react-hooks/refs lint rule in eslint-plugin-react-hooks v7 (Compilation Skipped: Cannot access refs during render).

The fix follows the same pattern already used in the dynamic example: capture the offset in a plain ref via useLayoutEffect and use that ref's value as scrollMargin.

const listOffsetRef = React.useRef(0)

React.useLayoutEffect(() => {
  listOffsetRef.current = listRef.current?.offsetTop ?? 0
}, [])

const virtualizer = useWindowVirtualizer({
  // ...
  scrollMargin: listOffsetRef.current,
})

Fixes #1116

[changeset-bot]

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