openai/gpt-chat-latest → A (100:1)

Commit A introduces substantial new functionality and architectural changes. It adds a new RocksDB-backed durable storage crate, moves raw Reddit entity payloads out of in-memory structures into persistent storage, changes replay to stream the event log line-by-line to reduce startup memory usage, updates application state and Reddit import paths to use the new storage layer, adds tests, and integrates the new crate into the workspace and build. These changes materially affect performance, persistence, memory usage, and project architecture. Commit B is a small cleanup that removes a few UI elements and adjusts CSS gradients for the voting slider, with only minor presentation impact.