chore(deps): update dependency tailwindcss to v4

Author: renovate[bot]

.web/package.json

@@ -21,7 +21,7 @@
     "@types/node": "^20.14.0",
     "autoprefixer": "^10.4.13",
     "postcss": "^8.4.20",
-    "tailwindcss": "^3.2.4",
+    "tailwindcss": "^4.0.0",
     "typescript": "^5.9.3",
     "vitepress": "^1.6.4",
     "vue": "^3.2.45",