~x-ai/grok-latest → B (2:3)

B fixes a systemic correctness issue by replacing duplicated hardcoded host cases (oauth/linear/spotify/twitter/youtube/login plus frontend authUtils) with a shared HOSTNAME-aware get-base-url and window.location.origin, and wires deploy to staging—lasting multi-host infra. A is a solid but localized UX win: the ranked-list pin becomes an unpin POST form with theme CSS and an extended browser test, reusing an existing flow rather than foundation design.