~x-ai/grok-latest → A (2:1)

A redesigns auth to return HTML fragments and extends the shared poem fetch interceptor to morph non-empty bodies, unifying layouts and giving lasting inline success/error UX without breaking empty-body ingest forms. B is worthwhile cleanup (SSR #new-thread-ui-slot on home, delete ExpandNewThreadForm + toolbar), but it mainly removes redundant indirection already solved on room pages rather than adding comparable capability.