fix(app): support ctrl-n/p in lists

[ryanmiville]

What does this PR do?

Adds ctrl+n/p keyboard navigation to lists (ex: command palette). ctrl+n moves down, ctrl+p moves up.

How did you verify your code works?

1. Run app locally
2. Open command palette
3. Verify ctrl+n moves selection down, ctrl+p moves up
4. Verify arrow keys and Enter still work

[github-actions]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Based on my search, I found a potentially related PR:

Related PR:

• PR Fix ctrl+p/ctrl+n navigation in multi-line TUI prompts #5473: "Fix ctrl+p/ctrl+n navigation in multi-line TUI prompts"
  • Fix ctrl+p/ctrl+n navigation in multi-line TUI prompts #5473
  • This PR appears to address similar functionality (ctrl+p/ctrl+n navigation) but in a different context (TUI prompts vs. lists/command palette)

The other results (#8786 and #9021) are related to keyboard navigation and TUI but don't appear to be direct duplicates.

Note: The current PR #10036 is the top result in the searches, confirming this is the PR you're checking. The PR #5473 seems to be the most related, though it may be targeting a different component (TUI prompts rather than lists). You may want to verify if there's any code overlap or if these can be consolidated.