A cleaner look for Critique

A visual refresh across Critique. Submission cards now respond the way cards do everywhere else on the platform, feedback responses read as proper content cards with more breathing room, and the revision history is a real timeline -- a rail with markers for each version, so you can see a piece of work evolve at a glance.

Nothing moved and nothing works differently; it just reads better. All of it passed the same automated accessibility and contrast checks that gate every release.