This has been something we've wanted to do for a long time since docs
aside thus far have been hard-anchored either at the top or bottom of
the container that their trigger is sitting in. This PR introduces the
change so that they're centered with their trigger, regardless of
whether it's on a context menu or picker, by including a canvas element
in both the container and the trigger to calculate where the docs aside
should precisely sit on. Here's the result:
https://github.com/user-attachments/assets/8147ad05-1927-4353-991d-405631de67d0
Note that at the moment, docs aside are only visible through _hovering_,
and ideally, they should be available on both hover and selection
(keyboard nav). But I'll leave that for later.
Release Notes:
- N/A
189b5ff3a2