optimize exported Markdown style, treat user input as H2

Author: zhoukuncheng

src/app/components/Share/MarkdownView.tsx

@@ -13,10 +13,18 @@ const MarkdownView: FC<Props> = ({ messages }) => {
   const content = useMemo(() => {
     return messages
       .filter((m) => !!m.text)
-      .map((m) => `**${m.author}**: ` + m.text)
-      .join('\n\n')
-  }, [messages])
-
+      .map((m) => {
+        // Check if author is "user"
+        if (m.author === "user") {
+          // Format as an h2 markdown element
+          return `## ${m.author}: ${m.text}`;
+        } else {
+          return `**${m.author}**: ${m.text}`;
+        }
+      })
+      .join('\n\n');
+  }, [messages]);
+  
   const copy = useCallback(() => {
     navigator.clipboard.writeText(content)
     setCopied(true)