The BAMBOORAFT physical sheet has the ✚✚✚ blue border running
around the entire card edge, not just between mini-cards. Adds
matching top/bottom/left/right frames using the existing
.section-divider plus a new .section-divider-vertical. Drops the
thin slate outer border (replaced by the hatch frame) and the
per-cell border-r/border-b lines (the white-on-blue contrast already
delineates cells, matching the flat physical-paper look). Outer
wrapper rounded-md instead of rounded-2xl to feel more like
a printed card edge.