chore(deps): update dependency tailwindcss to v4

Author: renovate[bot]

frontend/packages/contestant/package.json

@@ -37,7 +37,7 @@
     "postcss": "^8.4.41",
     "prettier": "^3.3.3",
     "storybook": "^8.2.9",
-    "tailwindcss": "^3.4.10",
+    "tailwindcss": "^4.0.0",
     "vite": "^6.0.0",
     "vite-tsconfig-paths": "^5.0.1",
     "vitest": "^3.0.0"