The Arduino Nano ESP32 starter card rendered a plain DevKit V1; the art for
it and for S3/C3/CAM/DevKitC-v4/XIAO/SuperMini has existed in public/boards/
all along. BOARD_COPIES now normalizes them into component-svgs/ and
BOARD_DEFS points each kind at its own file (w/h keep each SVG's aspect).