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

Side B fixes a real bug (the vote-compare preview region never actually morphed with the new post card, only edge history did), improves sort semantics of vote history display, adds a fullscreen layout with cross-theme CSS, and includes a targeted new unit test plus doc updates. Side A is a smaller, useful fix (display_path in hrefs) with a much more thorough test rewrite, but its scope and impact are narrower than B's combination of bugfix + feature + layout + tests.