Enhance LLM export with llms.txt index and copyToLLM styling

[jinzhongjia]

Summary

• Add llms.txt and llms-full.txt index generation following llmstxt.org standard for LLM-friendly content discovery
• Recognize <llm-only> as a custom Vue element, hidden on web but included in LLM exports
• Extract inline styles from copyToLLM component into dedicated CSS file with improved accessibility (ARIA attributes, focus states, transitions)
• Add click-outside and Escape key handlers to close the copy menu for better UX
• Pass site title and description to LLM markdown generation for metadata headers

Changes

config.mts: Configure Vue to recognize <llm-only> elements; pass title/description to plugin

llmMarkdown.ts: Generate llms.txt (linked index) and llms-full.txt (concatenated content); implement unwrapLlmOnly() to strip tags for LLM output while keeping them for web display

copyToLLM.ts: Move inline styles to CSS classes; add keyboard/click event handlers for menu closure; add ARIA attributes for accessibility

copyToLLM.css (new): Style copy menu, trigger button, and hide <llm-only> blocks on web

index.ts: Import new stylesheet

[gemini-code-assist]

Code Review

This pull request enhances the LLM-friendly markdown generation by introducing llms.txt and llms-full.txt indexes, supporting <llm-only> custom elements to hide web-only content, and refactoring the copy-to-LLM UI component to use external CSS and support keyboard/click-away interactions. The review feedback suggests three key improvements: using relative paths in llms.txt for better portability, stripping custom VitePress anchors from headings when parsing titles, and updating the <llm-only> regex to handle potential HTML attributes.

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[gemini-code-assist]

Using relative paths in llms.txt is more robust and portable than hardcoding ORIGIN. It allows the index to work correctly on local previews, staging environments, or if the site is hosted under a different domain or base path. LLM clients will resolve these relative links against the URL of the llms.txt file itself.

Suggested change

	return `- [${title}](${ORIGIN}/llms/${page.relativePath})`;
	return "- [" + title + "](llms/" + page.relativePath + ")";

[gemini-code-assist]

VitePress headings often contain custom anchors like {#custom-id} (e.g., # Zig 语言圣经 {#zig-bible}). The current regex will include these anchors in the title, which looks messy in the llms.txt index. Stripping them out ensures a clean title.

function firstHeading(markdown: string): string | null {
  const match = markdown.match(/^#\\s+(.+)$/m);
  if (!match) return null;
  return match[1].replace(/\\{#[\\w-]+\\\}\\s*$/, "").trim();
}

[gemini-code-assist]

If the <llm-only> tag has any attributes (such as classes, styles, or Vue directives) or multiple spaces, the current regex /<\\/?llm-only\\s*>/gi will fail to match and strip it. Updating the regex to support optional attributes ensures that the tags are always stripped correctly from the LLM markdown output.

function unwrapLlmOnly(markdown: string): string {
  return markdown.replace(/<\\/?llm-only(?:\\s+[^>]*)?>/gi, "");
}