feat(theme)!: add CodeBlock / CodeButtonGroup components and migrate .rp-doc-outline to rp-toc-include

[SoonIter]

Summary

feat(theme)!: add CodeBlock / CodeButtonGroup components

className change

• migrate rp-toc rp-doc-outline to rp-toc-include

Related Issue

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This PR introduces new CodeBlock and CodeButtonGroup components while migrating CSS class names from rp-toc and rp-doc-outline to rp-toc-include and updating code block styling to use rp-codeblock class structure.

• Adds new standalone CodeBlock and CodeButtonGroup components with improved architecture
• Migrates CSS class names for better consistency (rp-toc → rp-toc-include, language-specific classes → rp-codeblock)
• Refactors code block structure to use new component system with updated styling approach

Reviewed Changes

Copilot reviewed 29 out of 39 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
packages/theme-default/src/components/CodeBlock/index.tsx	New CodeBlock component providing styling wrapper for Shiki-generated code
packages/theme-default/src/components/CodeButtonGroup/index.tsx	Refactored CodeButtonGroup with updated hook and ref handling
packages/theme-default/src/components/DocContent/docComponents/pre.tsx	New ShikiPre component replacing old pre component structure
packages/theme-default/src/components/DocContent/docComponents/title.tsx	Updated heading components to use rp-toc-include class with clsx
packages/theme-default/src/styles/shiki.scss	Updated CSS selectors to use new .shiki class structure
packages/core/src/node/mdx/rehypePlugins/transformers/add-lang.ts	New transformer to add lang property to pre elements
e2e/fixtures/**/*.test.ts	Updated test selectors to match new CSS class names

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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