fix(docs): update theme screenshots and add missing themes

[ashmod]

Summary

• Added missing built-in themes: Holiday, Shades Of Purple
• Replaced all theme screenshots with up-to-date captures reflecting the current UI
• Added missing image assets (solarized-dark, solarized-light) that were referenced but didn't exist

Note on image paths

Image paths use /assets/... which does not render in the raw markdown on GitHub. Relative paths
(../assets/...) would fix that, but the previous version used absolute paths I assume because the external docs site
build resolves them differently. So I kept path format as-is.

Related Issues

Closes #20688

Pre-Merge Checklist

• Updated relevant documentation and README (if needed)

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the documentation for CLI themes by ensuring its accuracy and completeness. It introduces two new built-in themes, updates all existing theme screenshots to reflect the current user interface, and addresses missing image asset references, providing a more current and comprehensive guide for users.

Highlights

• New Themes Added: Added 'Holiday' and 'Shades Of Purple' to the list of available dark themes in the documentation.
• Screenshot Updates: Replaced all existing theme screenshots with up-to-date captures that reflect the current UI, including renaming 'Atom OneDark' to 'Atom One' in the documentation.
• Missing Image Assets: Included references for previously missing image assets for Solarized Dark and Solarized Light themes.

Changelog

• docs/cli/themes.md
  • Added 'Holiday' and 'Shades Of Purple' to the list of dark themes.
  • Updated image references for various themes, changing filenames to include a '-dark' suffix.
  • Added new image references for 'Holiday' and 'Shades Of Purple' themes.
  • Corrected the heading for 'Atom OneDark' to 'Atom One'.

Activity

• No human activity has been recorded on this pull request yet.

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[gemini-code-assist]

Code Review

This pull request updates the theme documentation in docs/cli/themes.md. It adds entries and screenshots for the 'Holiday' and 'Shades Of Purple' themes. It also updates the image paths for several existing themes and corrects the heading for the 'Atom One' theme to be consistent with its definition. The changes are confined to documentation and appear to correctly reflect the available themes.

[diodesign]

After this is merged, the new and updated PNGs need to be uploaded to the site. I can do that and aiming to automate.

[diodesign]

This should ideally be merged after the site-side code is updated to automatically load images from the Gemini CLI repo into the website

Edit: That site-side update is now merged, so this is good to go.

[lesteral]

This also fixed #19423 - thank you.