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#### PR Dependency Tree
* **PR #13015** 👈
This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)
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## Summary by CodeRabbit
* **New Features**
* Introduced a new AI tool for generating self-contained HTML artifacts,
including a dedicated interface for previewing, copying, and downloading
generated HTML.
* Added syntax highlighting and preview capabilities for HTML artifacts
in chat and tool panels.
* Integrated the new HTML artifact tool into the AI chat prompt and
Copilot toolset.
* **Enhancements**
* Improved artifact preview panel layout and sizing for a better user
experience.
* Enhanced HTML preview components to support both model-based and raw
HTML rendering.
* **Dependency Updates**
* Added the "shiki" library for advanced syntax highlighting.
* **Bug Fixes**
* None.
* **Chores**
* Updated internal imports and code structure to support new features
and maintain consistency.
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## Summary by CodeRabbit
- **Refactor**
- Streamlined and consolidated block and inline extension exports by removing multiple block-spec and inline extension arrays from public APIs.
- Reduced exported constants, types, and utility functions related to various block and embed features.
- Simplified the codebase by removing deprecated type guards, adapter extensions, and redundant extension groupings.
- **Chores**
- Cleaned up internal APIs by deleting unused exports, imports, and outdated code, enhancing maintainability.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Introduced a preview mode for code blocks, allowing users to toggle between code and rendered previews (e.g., HTML output) directly within the editor.
- Added a preview toggle button to the code block toolbar for supported languages.
- Enabled dynamic rendering of code block previews using a shared WebContainer, allowing live HTML previews in an embedded iframe.
- Added HTML preview support with loading and error states for enhanced user feedback.
- Integrated the preview feature as a view extension provider for seamless framework support.
- **Bug Fixes**
- Improved toolbar layout and button alignment for a cleaner user interface.
- **Tests**
- Added end-to-end tests to verify the new code block preview functionality and language switching behavior.
- **Chores**
- Updated development server configuration to include enhanced security headers.
- Added a new runtime dependency for WebContainer support.
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Peng Xiao