The json reader of the binfile v3 import rewrites every key of every
entry to kebab-case, nested maps included. Shape `:svg-attrs` is the one
map whose keys are camelCase react prop names, because the svg import
path runs them through `attrs->props`, so an attribute exported as
`fillRule` came back as `:fill-rule` and was stored that way.
The renderer looks the attribute up by its camelCase name, does not find
it and falls back to the default fill rule, so a shape exported with
`fillRule: evenodd` was painted without its hole, and the attributes
panel showed `fill-rule`.
`clean-shape-post-decode` already runs on every shape right after the
schema decode, for page shapes and component objects alike, so the
repair goes there: run `:svg-attrs` back through `attrs->props`, the
same transform that built the keys. It is idempotent, so shapes that
arrive correct are left untouched.
The new tests import a real export that carries the attribute, for
page shapes and component shapes.
Closes#11954
AI-assisted-by: space-bunny-free
