Settings page gains two new sections: - Connected Accounts: shows linked Google email (read-only) - Gemini API Key: paste personal key from aistudio.google.com, shows masked hint of saved key, remove link to revert to server key POST /settings/gemini-key saves/clears gemini_api_key in auth.json. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>