fix(message): gate "Copy Text" to textual message types

Review noted media without a caption has a filename body, so Copy Text showed
and copied the filename. Gate to m.text/m.emote/m.notice so it only appears for
actual text messages (matching the intended behavior).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/features/room/message/Message.tsx

@@ -423,10 +423,14 @@ export const MessageCopyTextItem = as<
   }
 >(({ mEvent, onClose, ...props }, ref) => {
   const content = mEvent.getContent();
+  // Text-only: for media the `body` is the filename (or caption). We don't want
+  // "Copy Text" to copy a filename, so gate to textual message types.
+  const msgtype = content.msgtype;
+  const isTextual = msgtype === 'm.text' || msgtype === 'm.emote' || msgtype === 'm.notice';
   const rawBody = typeof content.body === 'string' ? content.body : '';
   const body = trimReplyFromBody(rawBody).trim();
 
-  if (!body) return null;
+  if (!isTextual || !body) return null;
 
   const handleCopy = () => {
     copyToClipboard(body);