New chat option for Enter key: submit chat, or add newline

[949cee8acfb6aac2db21 (Peter Th)]

Related feature request:

Submit prompt with control+enter in composer

It’s a little bit off for me to type a long message in composer and hit enter by error and trigger the AI. I want to complete the whole context message before hitting triggering the submit and I think this would be a great idea.