DrawingProjectionFace: "top" | "bottom" | "front" | "back" | "left" | "right"

Convenience preset for the six AABB-face projections. Each resolves internally to a ProjectionBasis aligned with world axes — "top" projects along -worldUp with the AABB footprint as the image, "front" along +worldForward, etc. For arbitrary projection directions (oblique / diagonal views), pass a DrawingProjectionRay instead.