~anthropic/claude-sonnet-latest → B (3:1)

Side B implements substantive product functionality: fixing a broken morph (preview card was never actually rendered before), adding a proper ratio-normalization/sort algorithm for edge history, a new fullscreen layout mode with theme CSS across three themes, and updated/expanded tests validating the sort logic. Side A is a smaller but real deadlock fix in rpc.rs plus test/infra tweaks (timeouts, log-file redirection, username string fixes), which is useful but narrower in scope and impact than B's feature-level correctness work.