update tailwindcss@4

package.json

@@ -33,6 +33,7 @@
     "react-dom": "19.1.0"
   },
   "devDependencies": {
+    "@tailwindcss/postcss": "^4.0.17",
     "@types/nodemailer": "^6.4.17",
     "@types/uuid": "10.0.0",
     "eslint": "8.57.0",
@@ -40,11 +41,9 @@
     "eslint-config-prettier": "9.1.0",
     "jest": "29.7.0",
     "postcss": "^8.5.3",
-    "postcss-flexbugs-fixes": "5.0.2",
-    "postcss-preset-env": "^10.1.5",
     "prettier": "3.5.3",
     "swr": "2.3.3",
-    "tailwindcss": "3.4.17",
+    "tailwindcss": "^4.0.17",
     "ts-jest": "29.3.0"
   },
   "jest": {