Fix Tailwind config: add @tailwindcss/vite plugin and use bun server for production

- Add @tailwindcss/vite plugin for proper Tailwind processing
- Change 'start' script from 'vite preview' to 'bun server.ts' (production-ready)
- Remove postcss.config.mjs (handled by Vite plugin)
- server.ts already configured to serve from dist/ directory

Co-Authored-By: Claude Sonnet 4.5 (1M context) <noreply@anthropic.com>

bun.lock

@@ -13,6 +13,7 @@
         "tailwindcss": "^4.1.18",
       },
       "devDependencies": {
+        "@tailwindcss/vite": "^4.1.18",
         "@types/bun": "latest",
         "@types/react": "^19.2.8",
         "@types/react-dom": "^19.2.3",
@@ -211,6 +212,8 @@
 
     "@tailwindcss/postcss": ["@tailwindcss/postcss@4.1.18", "", { "dependencies": { "@alloc/quick-lru": "^5.2.0", "@tailwindcss/node": "4.1.18", "@tailwindcss/oxide": "4.1.18", "postcss": "^8.4.41", "tailwindcss": "4.1.18" } }, "sha512-Ce0GFnzAOuPyfV5SxjXGn0CubwGcuDB0zcdaPuCSzAa/2vII24JTkH+I6jcbXLb1ctjZMZZI6OjDaLPJQL1S0g=="],
 
+    "@tailwindcss/vite": ["@tailwindcss/vite@4.1.18", "", { "dependencies": { "@tailwindcss/node": "4.1.18", "@tailwindcss/oxide": "4.1.18", "tailwindcss": "4.1.18" }, "peerDependencies": { "vite": "^5.2.0 || ^6 || ^7" } }, "sha512-jVA+/UpKL1vRLg6Hkao5jldawNmRo7mQYrZtNHMIVpLfLhDml5nMRUo/8MwoX2vNXvnaXNNMedrMfMugAVX1nA=="],
+
     "@types/babel__core": ["@types/babel__core@7.20.5", "", { "dependencies": { "@babel/parser": "^7.20.7", "@babel/types": "^7.20.7", "@types/babel__generator": "*", "@types/babel__template": "*", "@types/babel__traverse": "*" } }, "sha512-qoQprZvz5wQFJwMDqeseRXWv3rqMvhgpbXFfVyWhbx9X47POIA6i/+dXefEmZKoAgOaTdaIgNSMqMIU61yRyzA=="],
 
     "@types/babel__generator": ["@types/babel__generator@7.27.0", "", { "dependencies": { "@babel/types": "^7.0.0" } }, "sha512-ufFd2Xi92OAVPYsy+P4n7/U7e68fex0+Ee8gSG9KX7eo084CWiQ4sdxktvdl0bOPupXtVJPY19zk6EwWqUQ8lg=="],