docs: Post component comments

[sevonj]

This is comments / documentation only, no actual code has been changed.

As a new contributor it was somewhat tedious to figure out what the components do. Their purposes and relationships aren't always straightforward. Often the same component is responsible for multiple distinct jobs. I added a couple @component-annotated doc comments on things that weren't immediately obvious to me.

Maybe some of the quirks could be refactored out, too.

[vercel[bot]]

@sevonj is attempting to deploy a commit to the Xylight's projects Team on Vercel.

A member of the Team first needs to authorize it.

[Xyphyn]

I'll add docs to components myself, but thanks for reminding me to do so!