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Adds PatternedSurface: a card whose pattern, glow and one chosen hero answer the
device, while the text and photos on it stay sharp. A metal surface recolours
everything on it, which suits a plate and ruins a card.
Patterns repeat artwork you own: a SwiftUI Shape, a Path, an SF Symbol, SVG or
an image. They lay out in grids, rings and spirals, and a soft light reveals
them as the card tilts.
A chosen hero catches a band of foil as the card turns. SurfaceHologram.subjectMask
builds its matte from the photo.
A surface can now be cut to a circle.
SurfaceForge runs on macOS, where a surface follows the pointer.