Card Art Drop Folder
Add each card as one PNG artwork and one matching PNG finish mask:
david.png
david-mask.png
The filename before .png is the card name shown in the harness. Names are
case-sensitive. Artwork and mask must:
- have identical dimensions;
- use a 5:7 aspect ratio;
- be fully opaque;
- use an opaque grayscale mask.
During npm run dev, adding or replacing either PNG refreshes the searchable
card catalog automatically. Reopening or focusing the Card field also forces a
rescan. Production builds generate manifest.json from this folder and fail if
any pair is missing or invalid.