[BUG] theme colour options are too limited

Environment

• Platform (select one):
• [x] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [ ] Other: <!-- specify -->
• Claude CLI version: 0.2.122 (Claude Code)
• Operating System: Archlinux
• Terminal: Ghostty

Bug Description

On first run of Claude Code, I am asked to choose a colour theme.

• There is no option to have a "No color" theme
• There also is no option to use a 'base16' colour theme

Steps to Reproduce

1. claude
2. No option for "No Colour" available

Expected Behavior

An option to choose a "No colour" theme

Actual Behavior

These colour themes are presented:

1. Dark mode
2. Light mode
3. Dark mode (colorblind-friendly)
4. Light mode (colorblind-friendly)
5. Dark mode (ANSI colors only)
6. Light mode (ANSI colors only)

Additional Context

I wonder if it is just the preview wizard appears to show incorrect preview colors ...