Admin auto-save:
- Every input change triggers save after 500ms debounce
- No more 'Save' button needed — edits are instant
- Color picker ↔ text input sync (change one, other updates)
- '✓ Saved' indicator flashes on successful save
- Uses fetch POST to same page (no reload)

Theme loader expanded:
- Ludo colors mapped to CSS vars (--ludo-red, --ludo-blue, etc.)
- Chess board colors mapped (--board-light, --board-dark, etc.)
- All theme values exposed as window.__EL3AB_THEME for JS access
- Games can read: window.__EL3AB_THEME?.ludo_red || '#E53935'

All edits in admin are now effective:
- Platform colors → CSS variables → used by all components
- Game colors → CSS variables → used by board renderers
- Animation speeds → CSS variables → used by transitions
- Button shapes → CSS variables → used by .btn classes
- Juice settings → available via getColor() for JS logic
- Uploaded assets → served from /public/assets/brand/
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>