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Replace the two flat markdown tables with a clean card grid grouped into thematic clusters per volume. Each card shows lab number, title, and core question only — no chips, ribbons, or accent rainbow. Single accent color matches the labs site brand (#2563EB). Lab 07 (Kernel Fusion Dividend) moves from Architecture to Performance & Deployment — kernel fusion is a runtime optimization, not a model-design choice. Capstones get their own dedicated cluster and span the full grid row; distinction comes from layout and placement, not color. Verified responsive from 320px to 1440px with zero horizontal overflow. Adds tools/capture_landing_shots.py — Playwright-based screenshot helper used during the redesign, reusable for future inventory work.