fix: use client-side ref to handle onclick string from transformerCopyButton

components/blog/button-client.tsx

@@ -0,0 +1,19 @@
+'use client'
+
+import { useEffect, useRef } from 'react'
+
+export function ClientButton({ children, onClick, ...props }: { children?: React.ReactNode; onClick?: string } & React.ButtonHTMLAttributes<HTMLButtonElement>) {
+  const btnRef = useRef<HTMLButtonElement>(null)
+
+  useEffect(() => {
+    if (typeof onClick === 'string' && btnRef.current) {
+      btnRef.current.onclick = onClick as any
+    }
+  }, [onClick])
+
+  return (
+    <button ref={btnRef} {...props}>
+      {children}
+    </button>
+  )
+}