openai/gpt-chat-latest → A (5:2)

Side A fixes a functional Reddit import bug by introducing `apply_entity_under_parent` to attach imported children without `ensure_path` creating unwanted `/comments/...` hierarchy, and updates the ranking panel to display imported child titles from the global tree instead of fallback labels. It also propagates the required tree context through the UI and adds integration tests covering SSE updates, child fetching, and rendering, whereas Side B is primarily a UI simplification that removes a redundant expand action and server-renders the collapsed compose state on the home page.