assistant2: Use `cmd-n` to create a new prompt editor when already in a prompt editor (#25935)

This flips the keybindings that are used to create a new thread/prompt
editor (only when you're already in a prompt editor)

Release Notes:

- N/A
909de2ca6fBennet Bo Fenner committed on 3/4/2025, 3:44:32 PM· committed by GitHubparentf31749c
3 files changedLine totals unavailable