[FEATURE]: Implement Double-ESC to trigger 'Restore/Undo' menu (Claude Code parity) #14037

Summary

Implement a feature where double-pressing the ESC key opens a "Restore / Undo" interactive menu, similar to the behavior in Claude Code.

Motivation

In Claude Code, double-pressing ESC activates a Restore the code and/or conversation menu. This is a highly ergonomic feature for several reasons:

1. Discoverability: Users often forget slash commands like /undo. A visual menu triggered by a common "exit/back" key pattern is intuitive.
2. Granularity: Instead of immediately executing a rollback (which might be destructive or confusing), a menu allows the user to choose what to undo (e.g., "Undo last message", "Revert file changes", "Clear context").
3. UX Consistency: As developers switch between AI CLI tools, adopting successful interaction patterns (like double-ESC) reduces cognitive load.

Current Behavior vs. Proposed

• Current: Users must type /undo manually. Double-ESC is currently being discussed for "Clear Input" or "Interrupt" (PR feat: add double-ESC keybind to clear input field #7320, Add configurable double-Esc interrupt window #5787).
• Proposed:
  • If an operation is running -> Double-ESC interrupts (existing/planned).
  • If input is populated -> Double-ESC clears input (planned).
  • If input is empty (idle state) -> Double-ESC opens the Restore/Undo menu.

Desired UX

When the user is in the idle state and presses ESC twice quickly:
A TUI modal appears with options such as:

• ↩️ Undo last message
• ⏪ Revert changes to files
• ❌ Cancel

This would greatly enhance the safety and control users feel when interacting with the agent.