fix: downgrade vanilla extract

packages/website/package.json

@@ -19,7 +19,7 @@
     "@radix-ui/themes": "^3.1.4",
     "@react-three/drei": "^9.115.0",
     "@react-three/fiber": "^8.17.10",
-    "@vanilla-extract/css": "^1.16.0",
+    "@vanilla-extract/css": "1.15.5",
     "@vanilla-extract/dynamic": "^2.1.2",
     "compare-versions": "^6.1.1",
     "echarts": "^5.5.1",