fix: remove carousel display mode

[idosal]

Carousel display mode was added as a placeholder, removed, and somehow ended back in.

Motivation and Context

Carousel isn't required at this point. We've received feedback that its purpose is unclear.
I think we should address additional display modes as the need arises.

How Has This Been Tested?

Breaking Changes

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context

[ochafik]

Thanks!