Add support for the special format value 'none' in util.styleText() which applies no additional styling to the text. This matches Node.js behavior where 'none' can be used both as a single format and within arrays of formats.
Changes:
- Add 'none' format handling in single format case (returns text unchanged)
- Add 'none' format skipping in array format case (continues to next format)
- Add comprehensive tests for both single and array usage
- Maintain backward compatibility with existing functionality
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Co-Authored-By: Claude <noreply@anthropic.com>
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