CLI - Support for `Ctrl` + `P/N` to move up and down in the file picker

[nathabonfim59]

How would you feel about having these shortcuts in the file picker?

It's more like a muscle memory for me, and considering it already has support for j/k in the diff view, it could be a great addition.

Also, my 60% keyboard doesn't have dedicated arrows keys :'(

PS: I know it also conflicts with the "open picker", but from what I've tested, it seems to take precedence and not cause any issues.

I've tested with Alt+J/K, it works as well, but it might cause conflicts with terminals that open the window file menu and hijack the shortcut from it.

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If you approve, I can open the PR. It's a one line change in the dropdown.tsx .

Proposed changes:
main...nathabonfim59:critique:main

Let me know what you think