upgrade to tailwind 4

package.json

@@ -16,17 +16,18 @@
     "@astrojs/react": "^4.3.0",
     "@astrojs/rss": "^4.0.12",
     "@astrojs/sitemap": "^3.4.1",
-    "@astrojs/tailwind": "^6.0.2",
     "@directus/sdk": "^19.1.0",
+    "@tailwindcss/vite": "^4.1.8",
+    "@tailwindcss/postcss": "^4.1.8",
     "astro": "^5.9.1",
     "framer-motion": "^12.16.0",
     "react": "^19.1.0",
     "react-dom": "^19.1.0",
     "react-hotkeys-hook": "^5.1.0",
     "react-icons": "^5.5.0",
-    "reading-time": "^1.5.0",
+    "postcss-preset-env": "^10.2.1",
     "sanitize-html": "^2.17.0",
-    "tailwindcss": "^3.0.24"
+    "tailwindcss": "^4.1.8"
   },
   "devDependencies": {
     "@tailwindcss/typography": "^0.5.16",