openai/gpt-chat-latest → A (9:1)

Side A adds substantial new functionality and infrastructure: a full pairwise voting UI, pair-selection logic that prioritizes bridge comparisons across ranking components, incremental DOM morph updates after voting, improved ItemId normalization via `from_storage`, and accompanying integration/tests. Side B fixes test infrastructure for OAuth/Reddit mocks (correct request-body handling, redirect behavior, query parsing, null checks, and Playwright helpers), which is valuable for test reliability but is confined to the test harness rather than the project's core behavior.