Implement markdown parsing for copy paste

Signed-off-by: Émile Ré <emile@getprobo.com>

packages/ui/src/RichEditor/CodeBlockExtension.ts

@@ -0,0 +1,14 @@
+// Copyright (c) 2026 Probo Inc <hello@getprobo.com>.
+// Use of this source code is governed by the ISC license
+// that can be found in the LICENSE file.
+
+import { CodeBlock } from "@tiptap/extension-code-block";
+import { ReactNodeViewRenderer } from "@tiptap/react";
+
+import { MermaidNodeView } from "./MermaidNodeView";
+
+export const CodeBlockExtension = CodeBlock.extend({
+  addNodeView() {
+    return ReactNodeViewRenderer(MermaidNodeView);
+  },
+});