[FEATURE] Spell check prompts

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 I make a spelling mistake when writing a prompt, no red underline appears.

Proposed Solution

When I make a spelling mistake when writing a prompt, a red underline appears to indicate my error. Has an option to disable spell-check.

Alternative Solutions

_No response_

Priority

Medium - Would be very helpful

Feature Category

Interactive mode (TUI)

Use Case Example

_No response_

Additional Context

_No response_