fix(tui): remove red coloring from code syntax highlighting

[liruifengv]

Related Issue

No linked issue — the problem is explained below.

Problem

Code syntax highlighting in the TUI (Write/Edit tool previews, approval panels, and assistant markdown code blocks) renders strings, regular expressions, and diff-block deletions in red. This comes from cli-highlight's default theme, which maps those tokens to chalk.red. The result is alarm-red noise all over ordinary code output, and red should not appear in code highlighting at all.

What changed

• Add a shared cli-highlight theme that resets exactly the three red tokens (string, regexp, deletion) to plain; every other token keeps the library default, so the rest of the highlighting is untouched.
• Route both highlight paths — tool-call file previews and the pi-tui markdown highlightCode — through this theme so behavior is consistent.
• Add tests asserting the three tokens are identity-styled and that, with colors forced on, highlighted JS strings/regexps and diff deletions emit no red SGR while keywords (blue) and diff additions (green) remain colored.

This approach fits Kimi Code because it keeps the change inside the theme layer (src/tui/theme/) as the single source of truth for color, without forking the highlight library or touching renderers.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

🦋 Changeset detected

Latest commit: 2320152

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@moonshot-ai/kimi-code	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[pkg-pr-new]

pnpm dlx https://pkg.pr.new/@moonshot-ai/kimi-code@2320152

npx https://pkg.pr.new/@moonshot-ai/kimi-code@2320152

commit: 2320152