New /diy/deck-designer tool. src/lib/deckDesign.ts holds the pure geometry
(outline, waist, rounded ends, kicks, concave) and the exporters; the component
renders a live top view, side profile and concave section with presets, saved
locally.
Exports: true-size SVG, a tiled 1:1 PDF (A4/Letter, split across sheets with
corner registration crosses), and an R12 DXF (outline polyline + 3/16" truck
holes + centreline, $INSUNITS=4). Truck patterns: New school 53.975x41.275 mm
and Old school 63.5x41.275 mm.
Deliberately 2D: this is the outline a builder traces and cuts, not a SK8CAD
clone (SK8CAD is proprietary; only its JSCAD engine is MIT, and we copied
nothing).
