Incorrect Name Showing on Replies After Performing a Search

## Bug report form
### Steps to reproduce
1. Go to a page where there are annotations and replies. Sample: https://web.hypothes.is/help/how-to-use-hypothesis-on-mobile-devices/
2. Perform a search that will yield an annotation with a reply. In this case search for 'brian'. It will show something similar to the image below

3. Click Show More in Conversation
4. Notice that the username who replied is mdiroberts and not brianmapes afterall.

Sample video

https://github.com/user-attachments/assets/6f6a2f3c-635a-4fc6-ae77-58ba49096f76

### Expected behaviour
The name that will show directly above the Show More button is the name of the user who replied. In case of multiple users, it should indicate that multiple users have replied.

### Actual behaviour
Tell us what happens instead.
The name showing directly above the Show More button is the name of the user whose annotation is being replied to.