fix(docs): clean code block highlights

[jonathanperis]

Summary

• Keep inline code chip styling out of fenced code blocks.
• Reset Shiki <pre><code> content so code samples render without per-line highlight boxes.

Validation

• bun run build
• rtk git diff --check

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 1ea6dc00-b257-4edf-817b-8ff2fcd1f97f

📥 Commits

Reviewing files that changed from the base of the PR and between 6e025a5 and fe8275b.

📒 Files selected for processing (1)

• docs/src/styles/docs.css

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/docs-code-block-highlights

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