fix(cli): resolve input handling flaws and add emergency abort

[KoushikAD1234]

Summary

This PR resolves a safety-critical issue where users on touch interfaces (like Termux on Android) were unable to interrupt or stop the AI agent due to inequitable keybindings and input race conditions. It introduces a dedicated "Emergency Abort" mechanism and optimizes mouse handling for mobile environments.

Details

• Emergency Abort: Introduced a "Raw" listener for Ctrl+C (\x03) that bypasses the standard input parser. This ensures that the interrupt signal is captured even if the UI thread or mouse parser is busy/locked.
• New Keybindings: Added F10 as a deterministic, single-key abort signal, which is much more reliable on mobile virtual keyboards than multi-key combinations.
• Mouse/ESC Race Condition: Fixed a conflict where mouse reporting escape sequences would "swallow" the ESC key byte (\x1b), leading to terminal freezes.
• Mobile Optimization: Mouse tracking is now disabled by default in touch-oriented environments (detected via TERMUX_VERSION, etc.) to prevent input flood corruption, while remaining enabled for desktop users.
• Suspension Safety: Updated useSuspend to properly restore terminal modes based on the new ui.mouseEvents settings.

Related Issues

Fixes #18087

How to Validate

1. Mobile/Termux Simulation:

   • Run the CLI with TERMUX_VERSION=0.118.0.
   • Verify that mouse tracking is disabled by default.
   • Start a long-running prompt and verify that pressing Ctrl+C (once) or F10 immediately stops the agent.

2. Desktop Validation:

   • Verify that mouse tracking still works as expected in the alternate buffer.
   • Verify that Ctrl+C once aborts a running request, while a second press (when idle) triggers the quit logic.

3. Settings Test:

   • Change ui.mouseEvents to enabled or disabled in settings.json and verify the behavior overrides the auto-detection.

Pre-Merge Checklist

• Updated relevant documentation and README (if needed)
• Added/updated tests (if needed)
• Noted breaking changes (if any)
• Validated on required platforms/methods:
  • MacOS (npm run)
  • Linux (Termux/Mobile simulation)

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses critical input handling issues in the CLI, particularly for users on touch-based interfaces. It introduces a robust emergency abort mechanism and provides granular control over terminal mouse tracking to prevent input corruption and terminal freezes, significantly improving the experience on mobile environments.

Highlights

• Emergency Abort: Added a raw listener for Ctrl+C and a new F10 keybinding to ensure AI agent tasks can be reliably interrupted even when the UI thread is busy.
• Mouse Event Control: Introduced the ui.mouseEvents setting to allow users to toggle mouse tracking, with automatic detection to disable it in touch-oriented environments like Termux.
• Stability Improvements: Resolved race conditions between mouse reporting and the ESC key, and updated suspension logic to ensure terminal modes are correctly restored.

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[gemini-code-assist]

Code Review

This pull request introduces a new configuration setting, "ui.mouseEvents", which allows users to control terminal mouse tracking. It defaults to "auto", which automatically disables mouse tracking in touch-oriented environments like Termux to prevent interference. Additionally, the PR implements an "Emergency Abort" feature, allowing users to cancel ongoing requests using Ctrl+C or F10 without exiting the CLI. This includes updates to the settings schema, documentation, event handling, and comprehensive test coverage for the new logic. I have no feedback to provide.

_{Note: Security Review did not run due to the size of the PR.}