feat: enhance UI with MUI and Tailwind integration

- Updated `package.json` to include new dependencies: Emotion, MUI Joy, Lucide React, and Tailwind CSS.
- Refactored `src/App.tsx` to implement a new layout with a sidebar and chat interface using MUI components.
- Added Tailwind CSS import in `src/App.css` for styling.
- Improved user interaction elements with icons and tooltips for a better user experience.

src/main.tsx

@@ -1,4 +1,5 @@
 import { render } from "preact";
+import "./App.css";
 import App from "./App";
 
 render(<App />, document.getElementById("root")!);