feat: markdown support language highlighting

[gene9831]

• markdown 支持语法高亮。使用 shiki 实现
• 代码块顶部增加工具栏，支持复制代码
• markdown html增加xss防护

目前是全量引入的 shiki，支持大量语法高亮，并且默认支持按需加载。不过由于全量引入，打包后体积非常大

Summary by CodeRabbit

Summary by CodeRabbit

• New Features

  • Added asynchronous Markdown rendering with syntax highlighting, HTML sanitization, and enhanced code block UI, including a copy-to-clipboard button for code snippets.
  • Introduced support for custom content transformation and DOMPurify configuration for secure Markdown rendering.
  • Externalized Markdown content in demos for better maintainability.
  • Updated bubble components to support Markdown content type with improved rendering and styling.
  • Added a new copy button component for easy code snippet copying.

• Bug Fixes

  • Improved handling and sanitization of custom tags and attributes in Markdown content.

• Documentation

  • Updated documentation and demos to reflect new Markdown rendering features and configuration options.
  • Updated demo imports to use custom element versions for better integration.

• Chores

  • Updated dependencies to use asynchronous Markdown parsing, syntax highlighting, and sanitization libraries.
  • Refactored component imports to use custom element variants where applicable.

[coderabbitai]

Walkthrough

The changes introduce asynchronous markdown rendering with syntax highlighting and sanitization using new dependencies and a composable. Components now support a transformContent function for async content transformation and a domPurifyConfig for XSS protection. Demo files are updated to externalize markdown content and configure custom tag sanitization, while code block UI is enhanced with copy buttons.

Changes

File(s)	Change Summary
packages/components/package.json	Replaced markdown-it with markdown-it-async, shiki, and dompurify; updated dev dependencies accordingly.
packages/components/src/bubble/composables/useMarkdownIt.ts	Added a new composable for async markdown parsing with syntax highlighting, sanitization, and code block toolbar/copy button.
packages/components/src/bubble/Bubble.vue	Switched to async markdown parsing with reactive content updates; added code block UI enhancements and LESS styles.
packages/components/src/bubble/BubbleList.vue	Integrated async markdown parsing in item props; updated types for item functions.
packages/components/src/bubble/index.type.ts	Added transformContent and domPurifyConfig to BubbleProps; updated markdown options import.
packages/components/src/bubble/CopyBtn.vue	Added a new component for copy-to-clipboard functionality in code blocks.
packages/components/src/icon-button/index.ts	Changed component import from .vue to .ce.vue.
docs/demos/bubble/list.vue	Changed "ai" role rendering from custom slot to markdown type; removed custom render function.
docs/demos/bubble/markdown.vue, docs/demos/bubble/streaming.vue	Externalized markdown content to markdown-data.ts and imported it.
docs/demos/bubble/markdown-data.ts	Added new module exporting sample markdown content with code blocks.
docs/demos/bubble/schema-render.vue	Updated markdown and DOMPurify config usage; imported BubbleProps; allowed custom tags in config.
docs/src/components/bubble.md	Updated demo component reference for schema card example; expanded API docs with new properties.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant BubbleList
    participant Bubble
    participant useMarkdownIt
    participant DOMPurify
    participant Shiki

    User->>BubbleList: Provide items with type 'markdown'
    BubbleList->>Bubble: Pass item props and transformContent (async)
    Bubble->>useMarkdownIt: Call parseMarkdown(content, mdConfig, domPurifyConfig)
    useMarkdownIt->>Shiki: Highlight code blocks (async)
    useMarkdownIt->>DOMPurify: Sanitize HTML output
    useMarkdownIt-->>Bubble: Return sanitized HTML
    Bubble-->>User: Rendered markdown with syntax highlighting and copy buttons

Loading

Poem

In the garden of code, markdown blooms anew,
Async and shiny, with highlights that woo.
Copy buttons sparkle, code blocks stand tall,
Sanitized safely—no bugs to befall!
A rabbit hops by, clipboard in paw,
Marveling at markdown, in perfect awe.
🐇✨

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📥 Commits

Reviewing files that changed from the base of the PR and between b017531 and 9ef64d2.

📒 Files selected for processing (1)

• packages/components/src/bubble/Bubble.vue (3 hunks)

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