Bug Description

Hello! We are trying to add support for Modal sandboxes for Vibekit. We are experiencing issues with authenticating Claude Code with an API key.

When entering the vibekit navigator in the CLI and selecting Authentication then Login to Claude, I am taken to a page on Anthropic's site requiring a max/pro plan. Despite the mention of API key usage no authentication option is present.

When running the quickstart, we receive an error informing us to go through the above authentication flow. Could you please advise? Thanks!

Steps to reproduce

1. Possess Claude Code access via API key (not via Pro/Max plan).
2. Run vibekit in CLI.
3. Navigate to Authentication and Login to Claude options.
4. Observe attached image.