- Fix grid columns 4 by using conditional logic instead of string interpolation
- Simplify CSS generator to only generate accent colors (mood/typography/shape/density now use data attributes)
- Add header component to all 7 preview pages with logo, nav, and cart
- Add header layout CSS for centered and minimal variants
- Move nav display property to CSS to enable minimal mode hiding
This resolves all high-priority theme control issues:
- Grid columns now supports 2, 3, and 4 columns
- Accent color picker now updates button colors
- Header layout control now works (standard, centered, minimal)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>