Divider primitive. Renders an <hr> wrapped in the shared formatting
div. Divider's own thickness/color/margin_y props control the
rule itself; formatting controls the wrapping container.
Props
thickness(integer 0..16, default1)color(string hex#RRGGBB, default"#e5e7eb")margin_y("sm" | "md" | "lg", default"md")formatting(map, optional)