~x-ai/grok-latest → A (5:1)

A consolidates duplicated test harness, HTTP/OAuth mocks, cargo build, and server-env helpers into common.bb/oauth.bb and rewires auth/grants/integration to use them, a lasting DRY improvement across the suite. B only trims a public new-thread compose toggle and tweaks labels/placeholders in forum.rs—cosmetic UI churn with little structural impact.