openai/gpt-chat-latest → A (4:1)

Side A fixes core application behavior by changing Reddit child imports to attach entities directly under the intended parent without path expansion, adds `apply_entity_under_parent` to preserve entity data, and updates the ranking panel to display imported child titles via the global tree instead of fallback IDs. It also extends integration tests to cover SSE updates and children imports, whereas Side B mainly repairs test mock infrastructure (query parsing, request handling, redirects, and Playwright selectors) so authentication E2E tests run again.