Vim mode should apply to the inline assistant prompt editor

[BenMusch]

Minor UX issue:

With vim more enabled, the chat window uses vim keybindings. But the Inline Assistant will exit and discard your prompt if you hit escape. This has been hard for me to adjust to -- I've hit escape to expecting to edit my prompt only to have the assistant close and the prompt totally discarded, which can be quite frustrating if the prompt was non-trivial.

I can adjust my muscle memory over time, but it feels more natural for the solution to be supporting vim keybindings within the inline editor

[Blackbird314]

Hi, why don't use jk/jj?

And I do have a new idea about canceling inline assistant: Exit inline assistant by Backspace without entering text