~x-ai/grok-latest → B (2:5)

B replaces the Reddit fetch stub with a full background broker (OAuth, rate-limit/backoff, dedup/TTL, JSON parsing for subreddits/posts) wired into browse and ensure_node—core lasting product capability. A mainly deletes the theme/cookie stack and consolidates CSS while adding cleaner `/~/` browse URLs on ItemId; useful routing design, but mostly simplification versus B’s new domain functionality.