openai/gpt-chat-latest → A (4:1)

Side A fixes the semantics of `thread_post_index` by making rank history consistently use the existing 0-based URL index, replacing silent `unwrap_or(0)` fallbacks with `expect(...)` to enforce the invariant, updating documentation, removing incorrect conditional rendering, and adding integration tests that verify the behavior. Side B is primarily a UI enhancement that refactors the CLI panel to support multiple commands with click-to-copy and adds assertions for JS-safe strings, which is useful but less fundamental than correcting and validating core data behavior.