Keyboard shortcut to reuse your last prompt

Quick feature request for the web UI!

It would be incredibly useful to have a keyboard short which simply loaded your last prompt.

Workflow:

→ User prompts
→ GPT outputs
→ User thinks of a revised prompt for better output

Currently UI is something like: user scrolls up past output to find their prompt, copies it to the clipboard, scrolls down, updates it

If this could be replaced by a simple keyboard shortcut (perhaps arrow up to capture the idea of a last prompt) it would be a big time-saver!