openai/gpt-chat-latest → B (9:1)

Side B introduces a substantial architectural shift from flat subreddit scopes to a hierarchical `ItemId`/`GlobalTree` model, updating parsing, state management, UI navigation (breadcrumbs and item links), vote recording, event handling, and tests to support canonical item identities and per-node rankings. Side A is a correct, targeted bug fix that skips `stickied`/`pinned` Reddit posts during import and adds a regression test, but its impact is much narrower than the persistent data model and UI capabilities added in Side B.