refactor(docs): type spec parsing + testing setup

[charislam]

This produces more complete type information (unions, following type alias refererences that aren't successfully dereferenced at an earlier stage, etc.), in a format that is much easier to query from UI components. Also adds a snapshot test for easier future iteration.

I had a lot of trouble configuring Jest for the snapshot tests (something to do with imports and compile targets), and there are zero other tests in this directory right now, so I just tore out the test setup and replaced it with Vitest. Much faster!

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