fix: petercat style (#446)

Author: YumoImer

.dumi/theme/common/PeterCat.tsx

@@ -1,6 +1,8 @@
 import { Assistant } from '@petercatai/assistant';
 import React from 'react';
 
+import '@petercatai/assistant/style';
+
 const PeterCat: React.FC = () => {
   return (
     <Assistant