self-hiding-child-cannot-hide-its-slot

A component that renders nothing when its feature is unavailable cannot remove the container someone else wrapped it in — gate the slot on the same availability predicate, publish that predicate beside the component, and branch the slot's clickable and non-clickable forms properly. Use when an empty cell, gap or stray divider appears where an optional control should be, when a group's rounded end caps land on the…