~x-ai/grok-latest → B (1:4)

B lands a real functional fix by centralizing base-URL logic (HOSTNAME / window.location.origin) across OAuth, login, Spotify/Twitter/YouTube callbacks and the frontend, plus switching the deploy workflow to staging—removing brittle hardcoded hosts. A only deletes a few lines of already-dead zero-ratio guard and tweaks the matching test, which is worthwhile hygiene but far smaller lasting impact.