openai/gpt-chat-latest → A (3:2)

Commit A fixes a functional runtime bug by defining and initializing GITHUB_API_BASE_URL, preventing a NameError during the GitHub OAuth callback when the API base URL is not otherwise set. That directly improves application correctness. Commit B is broader in scope but is primarily maintenance: resolving Clippy warnings, making small idiomatic cleanups, adding a missing #[test] attribute so an existing test runs, and suppressing dead-code warnings in shared test helpers. While valuable for code quality and test coverage, it introduces little new functionality or user-facing behavior compared with fixing a runtime failure.