fix(asset): add whcm values for asset background color

[jenndiaz]

Description

Addresses SWC issue 3376
"When running in high contrast mode the file and folder asset types should use the high contrast mode colours so they are always visible no matter the theme chosen"

Fix:

• use currentColor on the background fill of the file and folder background when forced-colors: active
• currentColor matches the inherited color property which unlike svg fill is overwritten with WHCM values

How and where has this been tested?

Please tag yourself on the tests you've marked complete to confirm the tests have been run by someone other than the author.

Validation steps

Open the docs site and emulate WHCM

• asset Folder and File are visible in a dark color scheme
• asset Folder and File are visible in a light color scheme

Regression testing

Validate:

1. The documentation pages for at least two other components are still loading, including:

• The pages render correctly, are accessible, and are responsive.

2. If components have been modified, VRTs have been run on this branch:

• VRTs have been run and looked at.
• Any VRT changes have been accepted (by reviewer and/or PR author), or there are no changes.

Screenshots

Before

Light

Dark

After

Light

Dark

To-do list

• I have read the contribution guidelines.
• I have updated relevant storybook stories and templates.
• I have tested these changes in Windows High Contrast mode.
• If my change impacts other components, I have tested to make sure they don't break.
• If my change impacts documentation, I have updated the documentation accordingly.
• ✨ This pull request is ready to merge. ✨

[github-actions]

🚀 Deployed on https://pr-2369--spectrum-css.netlify.app

[github-actions]

File metrics

Summary

Total size: 3.97 MB^*

🎉 No changes detected in any packages

* Size determined by adding together the size of the main file for all packages in the library.
* Results are not gzipped or minified.
* An ASCII character in UTF-8 is 8 bits or 1 byte.

[mdt2]

LGTM!

[castastrophe]

Looks good - should we add a VRT for forced colors to protect from possible regressions in future?