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.

tailwind.config.js

@@ -0,0 +1,13 @@
+/** @type {import('tailwindcss').Config} */
+export default {
+  content: ["./index.html", "./src/**/*.{js,ts,jsx,tsx}"],
+  theme: {
+    extend: {
+      fontFamily: {
+        // Como você já usa o @fontsource/inter, vamos integrá-lo aqui
+        inter: ["Inter", "sans-serif"],
+      },
+    },
+  },
+  plugins: [],
+};