openai/gpt-chat-latest → A (3:2)

Side A makes a functional UI architecture improvement by replacing the global `#entity-section` target with per-item `data-entity-section` selectors via `entity_section_selector`, updating all SSE morph calls accordingly, which enables correct updates for multiple entity sections and reuses `entity_section` in the voting UI. Side B is a worthwhile refactoring that centralizes duplicated test helpers, OAuth utilities, build logic, and test harness code, but it primarily improves test maintainability rather than changing core application behavior.