Fix ctrl+p/ctrl+n navigation in multi-line TUI prompts

[martinffx]

Summary

• Fixes ctrl+p/ctrl+n keybindings to enable cursor movement within multi-line input instead of always triggering history navigation
• History navigation now only activates when cursor is on boundary rows (first/last), allowing Emacs-style navigation within the

[martinffx]

@rekram1-node @adamdotdevin @thdxr would really like to get this looked at? not sure on the proper procedure is, happy to do whatever is needed.

real pain in the ass when navigating multi-line text inputs.