openai/gpt-chat-latest → A (4:1)

Side A replaces the hard-coded `#entity-section` target with a per-item `data-entity-section` selector via a shared `entity_section_selector()` helper, updates all SSE morph calls to use it, and reuses the same `entity_section` rendering in the voting UI, eliminating duplicated markup and avoiding reliance on duplicate IDs. Side B is a small but useful bug fix that defines `GITHUB_API_BASE_URL` with a default to prevent a NameError when the environment variable is absent, but its scope is much narrower.