- Remove iframe previews from theme detail and layout detail pages for cleaner UI
- Replace with informative layout cards showing descriptions and slot type badges
- Fix theme hot reload by switching from custom HMR to full page reload
- Update template renderer to use slot names as demo content
- Add SVG pattern generation for image slots with grid background and slot labels
- Improve demo content for all slot types (code, lists, tables, etc.)
- Clean up HMR listeners and simplify theme change detection
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Co-Authored-By: Claude <noreply@anthropic.com>