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

Side B fixes a real bug (vote-compare preview morph was previously not actually populating #vote-compare-preview with the new post card, now wired via ingest_entry_markup) plus adds a genuinely useful UX improvement (sorted edge history, fullscreen layout) with accompanying test coverage and CSS across themes. Side A is a solid but smaller feature (room create) that mostly strips an unused visibility field and simplifies a HashMap to a HashSet, which is reasonable cleanup but lower-impact than B's bugfix plus feature work with tests.