Prevent auto-scrolling in chat during streaming

[AaronMorf]

Type: Bug

Summary

The chat automatically scrolls to the bottom during streaming, which disrupts reading older messages.

Steps to Reproduce

1. Start streaming with an active chat.
2. Observe chat behavior as new messages arrive.

Expected Behavior

Chat should remain at the current scroll position unless manually scrolled by the user.

Actual Behavior

Chat continuously auto-scrolls to the bottom with each new message.

_{Filed via the omadia in-app issue reporter by @AaronMorf.}