openai/gpt-chat-latest → A (4:1)

Side A fixes a concrete data-model bug by introducing `apply_entity_under_parent` so Reddit listing imports attach posts directly under the subreddit without path expansion, and updates the ranking panel to display imported child titles by looking them up in the global tree. It also adds integration coverage for the import and SSE behavior, whereas Side B mainly replaces a sophisticated autocomplete workflow with a simpler paste-and-go URL parser and removes substantial functionality rather than improving core project behavior.