When you hover the row for a layer in the table, it highlights the
corresponding layer in the outfit viewer. And when you click anywhere
in the row, it opens the first link (usually the PNG image).
Sometimes I forget like, what the masc/fem variants of a given pet
actually look like? Some are super obvious about things like eyelashes,
and others use more subtle eye differences.
This is a cheap lil hack to make it easier to open a reference! Ideally
I think it would be neat to like, when you hover over an option, have
it show you the reference variant of that pose? But this is good enough
I think!
Most notable change here is extracting the pose option bubbles into a
`data-type="radio-grid"`, and pulling that into the `.support-form`
CSS. My rationale is that, unlike most fields, this field benefits from
being 100%-width, and I don't want to specify that as an override if I
can avoid it, because that's fragile-y.
Instead, I extract this into a generic type of field that
`.support-form` can use (it feels pretty reusable anyway!), and require
the caller to specify how many columns they want as `--num-columns`.
