feat(invdes): smoothed projection#2996

mahlau-flex merged 1 commit intodevelopflexcompute/tidy3d:developfrom

FXC-3297-Basic-subpixel-averaging-for-CustomMediumflexcompute/tidy3d:FXC-3297-Basic-subpixel-averaging-for-CustomMediumCopy head branch name to clipboard