Redesign the index as a responsive grid of square cover-art tiles with titles beneath, hiding the abstract/detail/meta rows (a cleaner gallery view, lifting the mobile bookshelf layout to all widths). Thumbnails now render from each paper's figures/cover.png as a 520x520 illustration tile (genCoverTile) instead of the full first page; falls back to the PDF page-1 render for anything without a cover (JOSS).