Add User email detail to about box

[ptone]

Summary

If the user is authenticated with Google login, the /about box now displays the email of the logged in user

Details

1. packages/core/src/index.ts: Exported UserAccountManager so it can be used by the CLI.
2. packages/cli/src/ui/types.ts: Updated HistoryItemAbout and Message types to include the optional userEmail field.
3. packages/cli/src/ui/commands/aboutCommand.ts: Modified the about command to instantiate UserAccountManager, retrieve the cached user email, and include it
   in the aboutItem.
4. packages/cli/src/ui/components/AboutBox.tsx: Updated the AboutBox component to conditionally render the "User Email" row if an email address is present.
5. packages/cli/src/ui/commands/aboutCommand.test.ts: Updated unit tests to mock UserAccountManager and verify that the user email is correctly passed to the
   UI.

Related Issues

fixes #13458

How to Validate

login with different auth methods and ensure email is shown when, and only when logged in via oauth

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 @ptone, 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 a new feature to display the authenticated user's email address within the /about box, specifically for users logged in with Google. The changes involve integrating user account management logic into the CLI's about command, updating UI data structures to support the new email field, and modifying the AboutBox component to render this information conditionally. This enhancement provides users with immediate access to their authenticated email directly within the application's information display.

Highlights

• User Email Display: The /about box now displays the email address of the logged-in user when authenticated via Google login, enhancing user information visibility.
• User Account Management Export: The UserAccountManager class has been exported from @google/gemini-cli-core, making it accessible for use by the CLI.
• UI Type Updates: The HistoryItemAbout and Message types in the CLI's UI have been updated to include an optional userEmail field, accommodating the new display feature.
• About Command Logic: The aboutCommand now instantiates UserAccountManager to retrieve the cached user email and passes it to the UI components.
• About Box Component Enhancement: The AboutBox React component has been modified to conditionally render the 'User Email' row only when an email address is available.
• Unit Test Coverage: Unit tests for the aboutCommand have been updated to mock UserAccountManager and verify that the user email is correctly passed and handled.

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[gemini-code-assist]

Code Review

This pull request adds the user's email to the about box when they are authenticated via Google login. The changes are well-structured, touching the necessary files from the core package to the UI components. My review focuses on improving the test coverage for this new feature. I've provided a suggestion to make the mock for UserAccountManager more flexible, which will enable testing the scenario where a user is not logged in and no email should be displayed. This will help ensure the feature is robust and behaves as expected in all cases.