/** Native dialogs also receive clicks in their padding; only clicks beyond the bounds dismiss. */
export function isDialogBackdrop(event: MouseEvent, dialog: HTMLDialogElement | null | undefined): boolean {
    if (!dialog || event.target !== dialog) return false;
    const rect = dialog.getBoundingClientRect();
    return event.clientX < rect.left || event.clientX > rect.right || event.clientY < rect.top || event.clientY > rect.bottom;
}