The alt styles controller is the one place we use this right now, but
I'm planning to generalize this to loading appearances during item
search, too!
I also add more `only` fields to the alt styles `as_json` call, because
idk it feels like good practice to both 1) say what we need in this
endpoint, rather than rely on default behavior upstream, and 2) to
avoid leaking fields we didn't realize were on there. (And also to
preserve bandwidth, too!)
Emi Matchu
c5cd1f2f3d