Refine the Playground's UI to improve user experience:
- Streamline chat window layout for better message readability
- Introduce a knowledge selection dropdown for easier context setting
- Improve image upload integration for a smoother workflow
- Optimize spacing and styling for a more polished visual appearance
Adds an HTML preview feature to the code block component, allowing users to view the rendered output of their HTML code snippets. This improves the user experience by providing a more interactive and informative way to understand the code.
