feat: disable inline media and event embeds in chat replies

Pass options to RichText component in ReplyPreview to disable:
- All media types (images, videos, audio) via showMedia: false
- Event embeds (note/nevent/naddr mentions) via showEventEmbeds: false

Chat reply previews now only show text content for cleaner, more
focused message context display.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/components/chat/ReplyPreview.tsx

@@ -64,7 +64,10 @@ export const ReplyPreview = memo(function ReplyPreview({
         className="font-medium flex-shrink-0"
       />
       <div className="line-clamp-1 overflow-hidden flex-1 min-w-0">
-        <RichText event={replyEvent} />
+        <RichText
+          event={replyEvent}
+          options={{ showMedia: false, showEventEmbeds: false }}
+        />
       </div>
     </div>
   );