update tailwind to v4

package.json

@@ -22,9 +22,9 @@
     "@playwright/test": "1.49.1",
     "@sveltejs/kit": "^2.15.2",
     "@sveltejs/vite-plugin-svelte": "^5.0.3",
+    "@tailwindcss/vite": "^4.0.0",
     "@types/eslint": "9.6.1",
     "@types/pg": "^8.11.10",
-    "autoprefixer": "^10.4.20",
     "bits-ui": "^1.4.7",
     "clsx": "^2.1.1",
     "cmdk-sv": "^0.0.18",
@@ -34,14 +34,13 @@
     "eslint-plugin-svelte": "^2.46.1",
     "globals": "15.14.0",
     "lucide-svelte": "^0.473.0",
-    "postcss": "^8.4.49",
     "prettier": "3.4.2",
     "prettier-plugin-svelte": "3.3.2",
     "svelte": "^5.16.5",
     "svelte-check": "4.1.1",
     "tailwind-merge": "^2.6.0",
     "tailwind-variants": "^0.3.1",
-    "tailwindcss": "^3.4.17",
+    "tailwindcss": "^4.0.0",
     "typescript": "5.7.2",
     "typescript-eslint": "8.19.1",
     "vite": "^6.0.7",