This folder will include code shared by both the client-side app and the server!
The server isn't using it yet, but it will in a new API endpoint soon! I'm doing this in a separate commit to avoid lumping all the import-change noise into that commit.
I'm doing this in preparation for an API endpoint to build outfit images by ID. It'll need the same logic to decide which layers are visible, and the same GQL fragments to load the relevant data!
