~anthropic/claude-sonnet-latest → B (6:1)

Side B fixes a real, spreading bug: hardcoded hostnames/URLs across multiple OAuth/redirect integrations (linear, twitter, spotify, youtube, login, oauth, frontend authUtils) that would break custom deployments, consolidating logic into a single util.get-base-url and enabling CI deploys from staging. Side A is a minor, low-risk cleanup removing dead-code guard in one reducer function, useful but narrow in scope and impact compared to B's cross-cutting correctness and deployability fix.