Balloon mask and color images correctly live at /color/images/ (served by
main site via nginx). Only the shine image path was wrong — it's at
/color/shine.svg, not /color/images/shine.svg. That missing file was the
actual cause of Safari showing ? placeholders. Previous commit incorrectly
moved everything to /color-picker/ which broke the CSS mask-image.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>