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-python/requirements.txt

@@ -0,0 +1,3 @@
+# requirements.txt gerado (estático, baseado na importação visível)
+llama-cpp-python>=0.2.0
+huggingface-hub>=0.20.0