feat: integrate Tailwind CSS for improved styling and layout

- Added Tailwind CSS and its Vite plugin to the frontend project.
- Updated App.svelte to enhance UI with Tailwind classes, including a new layout for the serial monitor and command tester.
- Improved logging functionality by increasing log history and adding more detailed log messages.
- Refactored SendBox.svelte for consistent styling with Tailwind.
- Enhanced Pico firmware to support structured event logging and command parsing.
- Updated README_PICO_SERIAL.md to provide comprehensive documentation on serial communication and backend integration.
- Added .dockerignore to optimize Docker builds by excluding unnecessary files.

frontend/package.json

@@ -14,7 +14,11 @@
     "@tsconfig/svelte": "^5.0.4",
     "svelte": "^5.38.1",
     "svelte-check": "^4.3.1",
+    "tailwindcss": "^4.1.12",
     "typescript": "~5.8.3",
     "vite": "^7.1.2"
+  },
+  "dependencies": {
+    "@tailwindcss/vite": "^4.1.12"
   }
 }