openai/gpt-chat-latest → A (100:1)

Side A introduces substantial new functionality: it adds a durable RocksDB-backed storage crate, moves raw Reddit entity JSON out of in-memory state into an EntityStore, changes replay to stream the event log line-by-line to reduce startup memory, and updates application logic and tests to use the new persistence model. Side B is limited to UI cleanup and CSS gradient tweaks plus removal of a few navigation/label elements, with no comparable architectural or functional impact.