Carousel

Renders a Material 3 horizontal carousel over tiles, one child per item. type picks the layout — multiBrowse sizes items around a preferred width with shrunken edge items, or uncontained uses a fixed item width. itemSpacing and contentPadding (applied horizontally only) are in dp, and userScrollEnabled toggles manual swiping. Listens for scroll-to-begin/end and next/previous-item broadcasts addressed to its id — it shares the pager's broadcast, so the same commands work on both tile types. Requesting the next item past the last one (or the previous one before the first) is a no-op. Children are rendered by index with no scope CompositionLocal. Dispatches onDisplay once when composed, and onPageChanged whenever the current item changes (skipping the initial item) — once per matching direction (any / start / end / that exact index).

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