/**
 * Walk up the DOM tree to detect if any ancestor provides a bounded height constraint.
 * An element is "bounded" when its computed `height` or `max-height` is explicitly set
 * (not `auto` / `none`). This distinguishes a flex parent with `h-screen` from one that
 * simply grows to wrap its content.
 */
export default function hasBoundedHeight(el: HTMLElement | null): boolean;