The shape API method .component() used locate-component which walks
to the outermost instance root via get-instance-root. For nested
component instances (e.g. a button inside a card), this incorrectly
returned the outer component (the card) instead of the nearest one
(the button).
Added locate-head-component in utils.cljs which uses get-head-shape
to find the nearest component head, and updated the :component
property in shape.cljs to use it.
Fixes#9183