Feature Request: Expand/Collapse Button for Long Messages

I'd love to suggest a UI improvement for handling long AI responses.

Currently, when the AI generates a long message, you have to scroll through the entire thing. It would be great to have an expand/collapse arrow button (like the down-chevron in the attached example) that lets you:

Collapse long messages to a preview by default

Tap the arrow to expand and read the full response

Re-collapse when done to keep the chat clean

This would make navigating long conversations much easier, especially on mobile where scrolling through huge responses is tedious.