Replace remote Tailwind CSS with a minimal local build; refine build script and UI styling.

- Added `tailwind.min.css` tailored to current app requirements to reduce external dependencies.
- Updated `index.html` to use the local Tailwind CSS file.
- Improved `package.json` `build` script to ensure `dist` directory creation and inclusion of all `public/` assets.
- Refined CSS and layout in `App.jsx` for better consistency and responsiveness.

app/web/package.json

@@ -5,7 +5,7 @@
   "type": "module",
   "scripts": {
     "dev": "bun run --hot src/index.jsx",
-    "build": "bun build ./src/index.jsx --outdir ./dist --minify && cp public/index.html dist/",
+    "build": "bun build ./src/index.jsx --outdir ./dist --minify && mkdir -p dist && cp -r public/* dist/",
     "start": "bun run dist/index.js"
   },
   "dependencies": {