fix(deps): update dependency tailwindcss to v4

Author: renovate[bot]

package.json

@@ -40,7 +40,7 @@
     "remark": "^15.0.1",
     "remark-rehype": "^11.1.2",
     "shiki": "^1.29.2",
-    "tailwindcss": "^3.4.17",
+    "tailwindcss": "^4.0.0",
     "typescript": "5.9.2",
     "zod": "^3.25.76"
   },