Add PreviewData module that provides mock data for theme preview:
- 12 diverse mock products with realistic details and placeholder images
- 3 cart items with variants and quantities
- 6 customer testimonials with ratings
- 5 product categories with counts
- Smart fallback: uses real data when available, mock otherwise
All data designed to showcase theme customization options.
Includes 19 comprehensive tests.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
- Create settings table for site-wide key-value configuration
- Create images table for BLOB storage of logo/header images
- Add Setting schema with JSON/string/integer/boolean support
- Add ThemeSettings embedded schema with all theme options
- Add Settings context with get/put/update operations
- Add Media context for image uploads and retrieval
- Add Image schema with SVG detection and storage
- Add 9 curated theme presets (gallery, studio, boutique, etc.)
- Add comprehensive tests for Settings and Media contexts
- Add seeds with default Studio preset
- All tests passing (29 tests, 0 failures)
