~x-ai/grok-latest → A (22:1)

A extracts shared thread-index helpers, fixes empty private-room gardens falling back to public content (with an integration test), documents tombstone stability in the reducer, and adds a full browser regression for PostRedact vs chronological indices—plus aligning FeedPost indexing to 0-based. B only relocates an errors div in new-thread HTML, a trivial presentation nit with no lasting design or correctness impact.