feat(cli): add hostname to footer status bar

[AdityaSharma-Git3207]

Summary

Adds the current system hostname to the persistent bottom status border.

This helps users quickly distinguish between multiple Gemini CLI sessions running across SSH hosts, virtual machines, containers, or remote systems.

Details

This change adds a new footer item: hostname.

• Added hostname to available footer items
• Added hostname to the default footer order
• Added hostname to legacy-derived defaults for backward compatibility
• Displays hostname using Node's built-in os.hostname()

The hostname uses the existing footer column layout, so current overflow and spacing behavior remain unchanged.

Related Issues

Closes #25661

How to Validate

1. Run Gemini CLI locally.
2. Check the persistent bottom status border.
3. Confirm a new host field is shown.
4. Verify the displayed hostname matches the current machine.
5. Resize terminal width and confirm footer layout still behaves correctly.

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

[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 enhances the Gemini CLI user experience by displaying the current system hostname in the persistent bottom status bar. This addition provides better visibility for users managing multiple CLI sessions across various remote or containerized environments, ensuring consistent layout behavior while maintaining backward compatibility with existing settings.

Highlights

• Hostname Integration: Added the system hostname to the persistent bottom status bar to improve session identification across different environments.
• Configuration Updates: Updated footer item definitions and default display order to include the new hostname field.
• UI Implementation: Implemented the hostname display logic in the Footer component using Node's os.hostname() utility.

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[gemini-code-assist]

Code Review

This pull request introduces a 'hostname' display item to the CLI footer, updating the configuration in footerItems.ts and the rendering logic in Footer.tsx. The review feedback highlights a performance improvement opportunity: the system hostname should be retrieved outside the render loop or memoized to avoid redundant system calls during the frequent re-renders of the Footer component.