refactor: remove dead color mix and tighten tests

[leoafarias]

Related issue

N/A

Description

Removes dead commented color mix and aligns tests/comments with actual behavior.

Changes

• Drop the commented color mix export and file.
• Clarify mergeability and variant comments.
• Replace placeholder/skipped tests with real assertions and add Material text token coverage.

Review Checklist

• Testing: Have you tested your changes, including unit tests and integration tests for affected code?
• Breaking Changes: Does this change introduce breaking changes affecting existing code or users?
• Documentation Updates: Are all relevant documentation files (e.g. README, API docs) updated to reflect the changes in this PR?
• Website Updates: Is the website containing the updates you make on documentation?

Additional Information (optional)

Ran in .

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Project	Deployment	Review	Updated (UTC)
mix-docs	Ready	Preview, Comment	Dec 23, 2025 9:40pm