integrate R module and add url editor ui
Replaces hardcoded paths with R module throughout:
- Shop components: layout nav, cart, product links
- Controllers: cart, checkout, contact, seo, order lookup
- Shop pages: collection, product, search, checkout success, etc.
- Site context: nav item url resolution
Admin URL management:
- Settings page: prefix editor with validation feedback
- Page renderer: url_editor component for page URLs
- CSS for url editor styling
Test updates for cache isolation
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
a41771efc8