Update class variance authority

[kmcginnes]

Description

When I originally installed Class Variance Authority I had forgotten they relaunched the NPM package under a different name. So we were using an older version that would never be updated automatically.

This changes over to the proper cva package and fixes any issues. It also ensures cva() calls are properly formatted by the Tailwind Prettier plugin.

Validation

• Smoke test

Related Issues

• None (tech debt)

Check List

• I confirm that my contribution is made under the terms of the Apache 2.0
  license.
• I have run pnpm checks to ensure code compiles and meets standards.
• I have run pnpm test to check if all tests are passing.
• I have covered new added functionality with unit tests if necessary.
• I have added an entry in the Changelog.md.