~anthropic/claude-sonnet-latest → B (6:4)

B introduces a genuine algorithmic improvement (bridge-preferring pair selection in pair.rs) and fixes a real correctness bug where Reddit permalinks with title slugs created duplicate ItemIds (ItemId::from_storage), backed by new unit and integration tests plus a Clojure e2e test. A is a solid but more mechanical feature (server-persisted theme cookie threaded through ~20 handlers) plus useful but secondary private-room URL prefixing fixes; it's broader in diff size but less deep in core logic than B's ranking/pair-selection and id-normalization fixes.