[FEATURE] Allow switching models while composing a prompt without losing input

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

When composing a prompt, I sometimes realize mid-typing that the task doesn't need the current model (e.g., Opus) and could be handled by a cheaper/faster model (e.g., Sonnet or Haiku).

However, there's no way to switch models without:

1. Canceling or discarding the current prompt
2. Running /model to switch
3. Re-typing or pasting the prompt

This creates friction, especially for longer prompts, and discourages cost-efficient model usage.

Proposed Solution

Keybinding while composing (e.g., Ctrl+M or Cmd+Shift+M) that cycles through available models or opens a model picker

Alternative Solutions

_No response_

Priority

Medium - Would be very helpful

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_