- The API key row stays visible whenever a key is stored, Ollama included, and Replace (with Remove key) stays enabled after a provider or base URL change, so "remove the key first" can be followed without undoing it. - One lock hint and one save-error guidance cover provider and base URL. - Closing the key sheet no longer resets the store mutation, so the PUT's verify still runs; a store error after dismissal shows under the key. - Reset and Save changes sit at the bottom of the screen (mock 1o). - Tests: base URL lock guidance, recover by removing the key with Ollama chosen, and dismissing the sheet while the PUT is pending. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>