openai/gpt-chat-latest → A (5:1)

Side A consolidates duplicated test infrastructure into shared utilities by introducing reusable helpers in `test.common` and `test.oauth` (shared assertions, server environment creation, cargo build wrapper, OAuth registration flow, configurable mock Google server, and common HTTP behavior with timeouts), then updates multiple test suites to use them. This reduces duplication and centralizes maintenance across the integration tests, whereas Side B is primarily a UI layout refactor that moves the delete button into the metadata component and adjusts CSS flexbox styling without changing core functionality.