Feathers color plane shader imports fix

[ickshonpe]

Objective

2026-08-20T13:12:53.161553Z ERROR bevy_render::render_resource::pipeline_cache: failed to process shader error:
\x1b[1m\x1b[91merror\x1b[0m\x1b[1m\x1b[97m: cannot find declaration of `okhsl_to_linear_rgb`\x1b[0m
  \x1b[1m\x1b[96m--> \x1b[0membedded://bevy_feathers/assets/shaders/color_plane.wesl:32:17
   \x1b[1m\x1b[96m|\x1b[0m
\x1b[1m\x1b[96m32\x1b[0m \x1b[1m\x1b[96m|\x1b[0m     return vec4(okhsl_to_linear_rgb(vec3(uv.x, uniform_data.fixed_channel, 1.0 - uv.y)), 1.0);
   \x1b[1m\x1b[96m|\x1b[0m                 \x1b[1m\x1b[91m^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\x1b[0m \x1b[1m\x1b[91mcannot find declaration of `okhsl_to_linear_rgb`\x1b[0m
   \x1b[1m\x1b[96m|\x1b[0m
   \x1b[1m\x1b[96m= \x1b[0m\x1b[1m\x1b[97mnote\x1b[0m: in declaration of `fragment` in bevy_feathers::assets::shaders::color_plane (embedded://bevy_feathers/assets/shaders/color_plane.wesl)

Solution

An okhsl_to_linear_rgb import is missing from color_plane.wesl. Added it.

[Zeophlite]

Looks like there's 2x separate fixes here, could you update the description?

[ickshonpe]

Looks like there's 2x separate fixes here, could you update the description?

Oh yeah sorry, that was a commit from a separate PR I must have included by accident.