@mention for replies are not togglable in Threads

Reproduction steps

Join a thread with other users inside of it.
Reply to a message by swiping to reply (if enabled) or long tapping a message and hitting reply.

Expected behaviour

I would be able to turn on / off @mentions next to the X button to cancel the reply like I would be able to outside of the thread.

Actual behaviour

No button is provided, so I would only be able to use the default @mention preference, if one has been set for the user. Note: The button to toggle @mentions is available on desktop.

Build information

Version 2026.10.100, Beta 8, Channel Beta, Build 2721, Android 10 (arm64), Device samsung SM-N960U1, Locale en-US, Push fcm, Flutter 3.47.7, Dart 3.13.5 Version 2026.10.100, Beta 8, Channel Beta, Build 90, iOS 16.0 (arm64), Device iPhone14,2, Locale en-US, Push apns, Flutter 3.47.7, Dart 3.13.5

Platform

Android, iOS