- Add woodPaneling.ts with localStorage-based paneling preferences
- Add woodPanelingInit.ts for early initialization (prevents flash)
- Support none, wood-light, wood-dark, wood-mahogany options
- Apply paneling to #collections-container only (not full body)
- Use Tailwind utility classes for backgrounds
- Use CSS variable classes for active indicators
- Export functions for HTML onclick handlers
- Auto-initialize on DOM ready