Preview mentions (#5571)

Co-authored-by: Tom Moor <tom.moor@gmail.com>

shared/utils/parseMentionUrl.ts

@@ -0,0 +1,12 @@
+const parseMentionUrl = (url: string) => {
+  const matches = url.match(
+    /^mention:\/\/([a-z0-9-]+)\/([a-z]+)\/([a-z0-9-]+)$/
+  );
+  if (!matches) {
+    return {};
+  }
+  const [id, mentionType, modelId] = matches.slice(1);
+  return { id, mentionType, modelId };
+};
+
+export default parseMentionUrl;