fix: when error copyHtml (#2663)

Author: Chasen-Zhang

src/components/CopyPageButton/index.tsx

@@ -49,9 +49,12 @@ const CopyDropdownButton: React.FC = () => {
         if (response.status === 200) {
           navigator.clipboard.writeText(response.data);
         } else {
-          alert($t("Failed to copy markdown"));
+          copyHtml();
         }
       })
+      .catch(() => {
+        copyHtml();
+      })
       .finally(() => {
         setLoading(false);
         setTimeout(() => {