feat(cli): add shortcuts to open @ mentions in editor or file browser

[Oerum]

Summary

This PR adds keyboard shortcuts to the @ mention completion list, allowing users to directly open the selected file/folder in their editor (Ctrl+X) or file browser (Ctrl+Shift+X). It improves navigation speed and provides clear visual hints in the UI for these new actions.

Details

• Utility Additions: Introduced an openDirectory function in editorUtils.ts to complement openFileInEditor.
• Hook Upgrades: Enhanced useAtCompletion to return explicit mentionTargetKind ('file' or 'directory') and absolute mentionTargetPath so the UI knows how to process the selected item.
• UI Integration:
  • Updated InputPrompt to handle the new Command.OPEN_SELECTED_MENTION and Command.OPEN_SELECTED_MENTION_LOCATION events.
  • Provided visual hints for these shortcuts directly inside the SuggestionsDisplay footer.
  • Added warning hint if the selected target is not a filesystem entity (e.g. agent).
• Keybindings: Handled the overlap between the legacy Ctrl+X command (which opened the prompt editor) and the new contextual action. When the @ suggestion window is active, it now strictly targets the mention, providing a hint about the legacy action if attempted inappropriately.

Related Issues

Closes #20500

How to Validate

1. Launch gemini-cli.
2. Type @ to trigger the mention list, or @src/ to search inside a folder.
3. Use Up/Down arrows to highlight a file or directory.
4. Press Ctrl+X to see it open in the configured external editor (for files) or default file explorer (for directories).
5. Press Ctrl+Shift+X to open the containing folder of the selected file.
6. Verify that Ctrl+X when the suggestion list is NOT active still correctly opens the external editor for the current prompt.

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 introduces keyboard-based navigation shortcuts for @ mention targets within the CLI. By allowing users to quickly open files or directories directly from the suggestion list, it streamlines the workflow for interacting with project resources. The changes include backend utility updates, UI feedback improvements, and robust keybinding management to handle command overlaps.

Highlights

• New Keyboard Shortcuts: Added Ctrl+X to open the selected @ mention target in an editor and Ctrl+Shift+X to open its containing folder in the file browser.
• UI Enhancements: Updated the suggestions display to show visual hints for these new shortcuts when a valid filesystem target is selected.
• Context-Aware Navigation: Improved @ mention completion logic to distinguish between files and directories, ensuring appropriate opening behavior.
• Legacy Command Handling: Refined the behavior of the legacy Ctrl+X command to prioritize mention selection when the suggestion list is active, while maintaining its original functionality otherwise.

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[gemini-code-assist]

Code Review

This pull request introduces new keyboard shortcuts to open file and folder mentions directly from the suggestion list. Users can now use Ctrl+X to open a selected file in their preferred editor (or a folder in the file browser) and Ctrl+Shift+X to open the containing directory. The changes include updates to the InputPrompt and SuggestionsDisplay components to support these actions and display relevant hints, enhancements to the useAtCompletion hook to provide necessary path metadata, and the addition of a new openDirectory utility. Documentation and test suites have been updated to reflect these improvements. I have no feedback to provide.

[spencer426]

Thank you for your interest in contributing to the project! We are closing this PR as the associated issue was closed.