refactor(ssg-md): redesign the remarkSplitMdx split logic

[SoonIter]

Summary

chore(ssg-md): refresh remarkSplitMdx

依赖于 remarkSplitMdx, 我们不需要用户配置任何 remark 和 rehype plugin 来单独处理 llms 相关，除了 MDX 中的 TSX 组件，会最大限度的保留 MDX 文件中的内容

Relying on remarkSplitMdx, we do not need users to configure any remark and rehype plugin, except for the TSX components in MDX, which will retain the content in the MDX file to the maximum extent.

llms: true

// index.mdx
# Hello

import { Tabs, Tab} from './Button.mdx';


<Tabs>
<Tab label="hello.tsx">

```tsx
```

</Tab>
</Tabs>

before

Pseudocode

const MDX = `# Hello` + jsxs(Tabs, { jsx(Tab, { jsx(Pre, { children })} ) })


export default () => {
   return MDX()
}

after

const MDX = 
`# Hello` + 

jsxs(Tabs, { jsx(Tab, { jsx(` \`\`\`tsx \`\`\```) })


export default () => {
   return MDX()
}

Related Issue

close #2894

Checklist

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

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[github-actions]

Rsdoctor Bundle Diff Analysis

Found 3 project(s) in monorepo.

📊 Quick Summary (Click to expand)

Project	Total Size	Change
node	8.9 MB	-
node_md	1.1 MB	-
web	14.9 MB	-

📋 Detailed Reports (Click to expand)

📁 node

Path: website/doc_build/diff-rsdoctor/node/rsdoctor-data.json

⚠️ No baseline data found - Unable to perform comparison analysis

Metric	Current	Baseline	Change
📊 Total Size	8.9 MB	-	-
📄 JavaScript	0 B	-	-
🎨 CSS	0 B	-	-
🌐 HTML	8.9 MB	-	-
📁 Other Assets	0 B	-	-

📁 node_md

Path: website/doc_build/diff-rsdoctor/node_md/rsdoctor-data.json

⚠️ No baseline data found - Unable to perform comparison analysis

Metric	Current	Baseline	Change
📊 Total Size	1.1 MB	-	-
📄 JavaScript	0 B	-	-
🎨 CSS	0 B	-	-
🌐 HTML	0 B	-	-
📁 Other Assets	1.1 MB	-	-

📁 web

Path: website/doc_build/diff-rsdoctor/web/rsdoctor-data.json

⚠️ No baseline data found - Unable to perform comparison analysis

Metric	Current	Baseline	Change
📊 Total Size	14.9 MB	-	-
📄 JavaScript	14.3 MB	-	-
🎨 CSS	115.4 KB	-	-
🌐 HTML	0 B	-	-
📁 Other Assets	512.9 KB	-	-

Generated by Rsdoctor GitHub Action

[Copilot]

Pull request overview

This PR refreshes the remarkSplitMdx plugin to improve MDX-to-markdown conversion for LLMs. The key improvement is that users no longer need to manually configure remark and rehype plugins to handle LLM content extraction—the system now automatically preserves MDX content while converting only non-whitelisted TSX components to markdown.

Key Changes

• Refactored remarkSplitMdx to recursively process JSX elements and their children, with new helper functions for component name extraction, fragment building, and tag serialization
• Added SSR_MD environment handling in Tabs and CodeBlock components to render simplified markdown-friendly output
• Enhanced code block rendering with support for nested markdown fences and proper language/title metadata preservation

Reviewed changes

Copilot reviewed 20 out of 21 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
pnpm-lock.yaml	Added new ssg-md fixture entry to lockfile
packages/core/src/theme/components/Tabs/index.tsx	Added SSR_MD mode to render tabs as markdown with bold labels
packages/core/src/theme/components/DocContent/docComponents/pre.tsx	Added data-lang and data-title attributes for SSG-MD metadata preservation
packages/core/src/theme/components/CodeBlock/index.tsx	Added SSR_MD mode to bypass CodeBlock wrapper and render raw children
packages/core/src/node/ssg-md/remarkSplitMdx.ts	Major refactor: added recursive JSX processing, improved import handling with visit utility, added helper functions for component name extraction and tag serialization
packages/core/src/node/ssg-md/remarkSplitMdx.test.ts	Updated test snapshots to reflect cleaner output without extra newlines
packages/core/src/node/ssg-md/react/render.ts	Enhanced pre/code rendering with nested backtick handling and metadata support, improved error handling
packages/core/src/node/ssg-md/react/render.test.tsx	Added tests for nested code blocks and mdx language fence handling
packages/core/src/node/mdx/options.ts	Added __base config to remarkLink for SSG-MD mode, disabled user remark/rehype plugins in SSG-MD mode
e2e/fixtures/ssg-md/*	Added comprehensive e2e test fixture with MDX fragments, TSX components, and build verification

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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