Unread notification dot and "NEW" indicator persist incorrectly after reading or replying to messages in DMs

​1. Receive a new message in DM, causing an unread notification dot to appear. ​2. Open the DM chat and view or reply to the incoming message. ​3. Go back to the DMs list and change to another chat. ​4. Go back again to the chat you replied and check the behavior of the notification dot and the "NEW" marker inside the chat.

The unread notification dot and "NEW" message indicator should immediately clear and disappear once the user enters the chat, reads the messages, or sends a reply.

The notification indicator persists even after replying, sometimes marking the user's own reply as the "NEW" message, or remaining active indefinitely until restarting the app or waiting several seconds.

Version 2026.11.100, Beta 2, Channel Beta, Build 890, Android 13 (arm64), Device Xiaomi 21061110AG, Locale en-US, Push fcm, Flutter 3.47.9, Dart 3.13.7