- Update chat API to require valid authentication tokens for all requests
- Add authentication requirement screens to both chat components
- Show "Create Account / Sign In" prompts for unauthenticated users
- Hide chat input and functionality until user is logged in
- Return 401 errors with clear messages when authentication is missing
- Maintain bilingual support (Romanian/English) for auth prompts
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Co-Authored-By: Claude <noreply@anthropic.com>