Build a plank-level companion panel node, addressed by its bare variant (e.g. settings). The id is
always the linked segment ~<variant>, so the companion shares the plank's attention and is uniformly
addressable as companion/<variant> in the URL. Return it from an extension declared with
companion.
Build a plank-level companion panel node, addressed by its bare
variant(e.g.settings). The id is always the linked segment~<variant>, so the companion shares the plank's attention and is uniformly addressable ascompanion/<variant>in the URL. Return it from an extension declared with companion.