Agent panel: support for readline style prompt history navigation mode, toggled on off via hotkey

[mlwelles]

Body

What are you proposing?

It would be great to have prompt history navigation in the Agent panel input, similar to shell history in a terminal, but in a way that doesn't interfere with editing the current prompt.

Maybe have a hotkey to toggle history navigation on and off and have it work the way readline does in terminal sessions if so,

• [TOGGLE HISTORY MAV MODE KEY ON ]
• Up Arrow or Ctrl+p previous prompt from session history
• Down Arrow or Ctrl+n next prompt from session history
• Ctrl+r reverse search for past prompts
• [TOGGLE HISTORY NAV MODE KEY OFF]
  ....back to editing

Why does this matter?

This is a significant usability gap compared to terminal-based AI tools.

What problem does this solve?
Currently there's no efficient way to reuse or recall previous prompts without scrolling through the conversation and manually copying text.

What becomes easier or possible?

Reusing or recall ingprevious prompts without scrolling through the conversation and manually copying text.

Are there any examples or context?

Screenshots, mockups, workflows, or examples from other tools.