~anthropic/claude-sonnet-latest → B (75:25)

Side B implements a real, non-trivial feature slice (fullscreen compare layout, new vote-preview morphing with post_id lookup, ratio-based sorting of edge history, plus tests and CSS across three themes), producing lasting product functionality. Side A is a useful but narrow test-infrastructure bugfix (correct regex split, request body reading, redirect codes, exception handling in a mock server) that only fixes CI/test flakiness rather than adding product capability.