[Bug]: Chat does not auto-scroll to most recent message

Description

When new messages arrive in chat, the view does not automatically scroll to the most recent message. The user has to manually scroll down to see new responses, which is disruptive during active conversations.

Expected Behavior

The chat view should auto-scroll to the bottom when:

• A new assistant message arrives or streams in
• The user sends a message
• The user is already at or near the bottom of the conversation

If the user has scrolled up to read earlier messages, auto-scroll should be suppressed (standard chat UX pattern). A "scroll to bottom" button should appear when new messages arrive while scrolled up.

Actual Behavior

Chat stays at the current scroll position when new messages arrive. The user must manually scroll down every time to see the latest response.

Impact

This is a core chat UX expectation. Every major chat app (Teams, Slack, iMessage, ChatGPT) auto-scrolls on new messages. Missing this makes the app feel broken during normal use.

Start by locating the chat view and its existing scroll handling, then reproduce the issue while sending messages and receiving streamed responses. Done means the view follows new messages when already near the bottom, preserves the position when the user has scrolled up, and shows a way to return to the bottom.