feat: add idleShutdownMinutes setting to auto-quit CLI after inactivity

[micahasmith]

Summary

closes #25211

Details

I use gemini-cli all day long. I've noticed that if i step away from the cli (hours) the memory usage blows up to the point that when i return i can neither /compress nor make any prompt/requests due to the context now being too large for the API.

Related Issues

closes #25211

How to Validate

• work in a chat for a few days/weeks
• step away from your computer for 24hrs with the cli open

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
    • npx
    • Docker
    • Podman
    • Seatbelt
  • Windows
    • npm run
    • npx
    • Docker
  • Linux
    • npm run
    • npx
    • Docker

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[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 introduces an idle shutdown feature for the CLI to help manage memory usage over long periods of inactivity. By allowing users to define a timeout period, the application can now automatically terminate when not in use, preventing context bloat and excessive resource consumption.

Highlights

• New Configuration Setting: Added a new setting 'general.idleShutdownMinutes' to allow users to configure an automatic shutdown of the CLI after a period of inactivity.
• Implementation: Implemented the idle shutdown logic in 'AppContainer.tsx' using a 'useEffect' hook that monitors the streaming state and triggers a '/quit' command after the specified duration.
• Testing: Added comprehensive unit tests in 'AppContainer.test.tsx' to verify that the idle timer correctly triggers the shutdown, respects the configuration, and resets when the application state changes.

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[gemini-code-assist]

Code Review

This pull request introduces an idle shutdown feature to the CLI, allowing the application to automatically close after a specified period of inactivity. The changes include adding a new configuration setting, general.idleShutdownMinutes, updating the settings schema and documentation, and implementing the timeout logic within the AppContainer component. Additionally, comprehensive unit tests were added to verify that the shutdown is triggered correctly and that the idle timer resets when the streaming state changes. I have no feedback to provide.