~x-ai/grok-latest → B (2:3)

B establishes lasting core design: path-based `/~/` browse routes, `ItemId::browse_href`/`from_browse_uri`, and drops the whole theme cookie/POST stack for a single stylesheet—structural URL and app-shell changes. A is solid product work (chromeless vote-compare, left-aligned edge-history sort, post morph + tests) but stays scoped to one UI flow rather than re-plumbing navigation.