Function overflow_scroll 

pub fn overflow_scroll<H: UiHost, I, T>(
    cx: &mut ElementContext<'_, H>,
    layout: LayoutRefinement,
    show_scrollbar: bool,
    f: impl FnOnce(&mut ElementContext<'_, H>) -> I,
) -> AnyElement
where
    I: IntoIterator<Item = T>,
    T: IntoUiElement<H>,

Component-layer scroll helper (typed, declarative).

Fret treats scrolling as an explicit element (not a boolean overflow flag). This wrapper exists to match gpui/tailwind ergonomics while keeping the runtime contract explicit.