New behavior:

1. select a pod,
2. ctrl-c to copy, and
3. ctrl-v to paste at the current mouse position (the same behavior in reactflow's example).

TODOs:

• support copying & pasting multiple pods
• support recursively copying scope pods
• copy connected edges as well
• copy the content as well, both code and rich pods
• highlight newly copied pods to indicate that it's not moved into a scope yet
• support copying results