- Remove unused generate_mood/1, generate_typography/1, generate_shape/1,
generate_density/1 functions from CSSGenerator (now handled via CSS
data attributes)
- Prefix unused _opts parameters in Printify.Client
- Remove unused created_products variable from MockupGenerator
- Update CSSGeneratorTest to test actual generated CSS (accent colors,
font size scale, layout width, etc.)
- Update PresetsTest to match 8 presets (not 9)
- Fix PreviewDataTest to accept local image paths
- Update ThemeLiveTest to use correct selectors and match actual UI
