Enter in Insert in Vim Mode should insert newline

[SamCB]

I'd expect when vim mode is enabled:

• When in insert mode
  • pressing <enter> will insert a new line
  • pressing <ctrl/opt-enter> will submit
• When in normal mode
  • pressing <enter> will submit

This is similar to how other vim specific ai chats work (e.g. Avante in neovim)

Currently <enter> will always submit the chat, whether in insert mode or not

[nikomatsakis]

+1 for this. Also, I suggest using vim commands like ZZ for submitting messages.

[github-actions[bot]]

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