Copilot cli dialog enhancement

### Describe the feature or problem you'd like to solve

Confusion and dificulty entering prompts and resonses leading to errors

### Proposed solution

Adding a built-in floating GUI prompt composer: large accessible text, word wrap, dark theme, Enter to return the draft, and no clipboard dependency. This greatly improves accessibility, spelling, and long-prompt composition. My copilot made one for me and it is a game changer, especially if you are visually impaired.

### Example prompts or workflows

_No response_

### Additional context

_No response_

No files, tests, or entry points are named. Start by locating the CLI's prompt-input flow and reviewing how interactive terminal input is handled; done means a built-in accessible floating composer supports large wrapped text, a dark theme, Enter to return the draft, and no clipboard dependency.

Written by the indexing model from the issue text.