We can't directly use frozen dataclasses from pydcs in our interface
because pydantic can't process them. Pydantic is able to automatically
convert to our modelview type from the pydcs type though.
This is briefly moving us over to my fork of pydcs while we wait for
https://github.com/pydcs/dcs/pull/206 to be merged. The adaptation is
invasive enough that I don't want it lingering for long.
Apparently it's a bad idea to try to make the core data pydantic models,
and those should really be treated more as a view-model. Doing otherwise
causes odd patterns (like the UI info I had leaked into the core type),
and makes it harder to interop with third-party types.
