upgrade to tailwindcss v4

Author: ryota-murakami

package.json

@@ -38,6 +38,7 @@
     "@tailwindcss/aspect-ratio": "^0.4.2",
     "@tailwindcss/forms": "^0.5.10",
     "@tailwindcss/line-clamp": "^0.4.4",
+    "@tailwindcss/postcss": "^4.0.0",
     "@tailwindcss/typography": "^0.5.16",
     "@testing-library/dom": "^10.4.0",
     "@testing-library/jest-dom": "^6.6.3",
@@ -51,7 +52,6 @@
     "@vitejs/plugin-react-swc": "^3.7.2",
     "@vitest/ui": "^2.1.6",
     "all-contributors-cli": "^6.26.1",
-    "autoprefixer": "^10.4.20",
     "concurrently": "^9.1.2",
     "cross-fetch": "^4.1.0",
     "eslint": "^9.19.0",
@@ -67,11 +67,10 @@
     "lint-staged": "^15.4.3",
     "msw": "^2.7.0",
     "postcss": "^8.5.1",
-    "postcss-import": "^16.1.0",
     "prettier": "^3.4.2",
     "prettier-plugin-tailwindcss": "^0.6.11",
     "rimraf": "^6.0.1",
-    "tailwindcss": "^3.4.17",
+    "tailwindcss": "^4.0.0",
     "ts-expect": "^1.3.0",
     "typescript": "^5.7.3",
     "vite": "^6.0.11",