[FEATURE]: Add double-ESC to clear input field #7319
Description
Feature hasn't been suggested before.
- I have verified this feature I'm about to request hasn't been suggested before.
Describe the enhancement you want to request
Summary
Add support for double-pressing ESC to clear the input field content.
Motivation
Many popular CLI tools have adopted this pattern:
- Claude Code - support
- Gemini CLI - support
- qwen-code - support
This has become a common UX pattern that users expect in terminal-based AI assistants.