feat: enable iframe rendering in markdown code block (#2799)

* enable iframe rendering in code block

* fix eslint issue

web/src/components/MemoContent/CodeBlock.tsx

@@ -15,6 +15,16 @@ const CodeBlock: React.FC<Props> = ({ language, content }: Props) => {
   const formatedLanguage = language.toLowerCase() || "plaintext";
   let highlightedCode = hljs.highlightAuto(content).value;
 
+  // Users can set Markdown code blocks as 'iframe'
+  // to embed videos or external audio links from services like Apple Music or Spotify.
+  if (formatedLanguage === "iframe") {
+    const renderHTML = () => {
+      return { __html: content };
+    };
+
+    return <div className="mx-auto w-11/12 !my-4" dangerouslySetInnerHTML={renderHTML()} />;
+  }
+
   try {
     const temp = hljs.highlight(content, {
       language: formatedLanguage,