Auto-scroll prevents manual scrolling while Copilot is updating the UI

[trsdn]

Description

When Copilot is actively working and streaming updates to the UI, the view constantly jumps to the bottom. This makes it impossible to scroll up and read previous output while Copilot is still generating content.

Expected Behavior

Users should be able to scroll freely through the terminal output even while Copilot is actively streaming updates. Auto-scroll to the bottom should only occur when the user is already at (or near) the bottom of the content.

Suggested Fix

Detect whether the user has manually scrolled away from the bottom. If so, suppress auto-scrolling until the user scrolls back to the bottom (or a threshold near it).