feat: Integrate forum layout support across various components and enhance room handling logic

src/app/features/forum/ForumMessageBody.tsx

@@ -0,0 +1,27 @@
+import React from 'react';
+import { Text } from 'folds';
+import * as theme from './forumTheme.css';
+
+type ForumMessageBodyProps = {
+  body: string;
+  bodyHtml?: string;
+};
+
+export function ForumMessageBody({ body, bodyHtml }: ForumMessageBodyProps) {
+  const plain = body.trim();
+  if (bodyHtml) {
+    return (
+      <div
+        className={theme.ForumMessageBodyRich}
+        // eslint-disable-next-line react/no-danger
+        dangerouslySetInnerHTML={{ __html: bodyHtml }}
+      />
+    );
+  }
+  if (!plain) return null;
+  return (
+    <Text as="p" className={theme.ForumMessageBody} size="T400">
+      {body}
+    </Text>
+  );
+}