Replace the 3D sphere brush with a square stamp in the surface tangent
plane whose shape and opacity come from a grayscale/alpha mask. Masks
are assignable via an inspector list with a live-switchable active index;
an empty list falls back to a procedurally generated circle mask that
reproduces the previous round brush.
- Mask drives opacity (luma * alpha * brushOpacity) via source-over blend
instead of a hard threshold cut; gray 0.5 = 50%.
- GPU and CPU paths stay identical; non-readable textures are supported on
the CPU via GPU blit-readback.
- Dilate pass treats any alpha > 0 as painted so soft edges survive seam
padding.
- Brush alignment enum (Camera/World) plus manual rotation; tangent frame
handedness fixed so stamps read upright and unmirrored in both modes.
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