feat: Implement proper Three.js logo system with custom environment mapping

- Replace CDN-based Three.js with npm packages for reliable loading
- Add DRACO loader support for compressed GLB files
- Implement custom horizon gradient environment mapping
- Use exact material properties from reference logo.html (MeshPhysicalMaterial)
- Apply proper metallic sheen, clearcoat, and reflectivity settings
- Fix camera positioning and canvas sizing to prevent clipping
- Maintain square aspect ratio for consistent logo display
- Load user's mobius-ring.glb with fallback torus geometry

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

brand-assets/brand-style-guide-site/public/icons/favicon_io/site.webmanifest

@@ -0,0 +1 @@
+{"name":"","short_name":"","icons":[{"src":"/android-chrome-192x192.png","sizes":"192x192","type":"image/png"},{"src":"/android-chrome-512x512.png","sizes":"512x512","type":"image/png"}],"theme_color":"#ffffff","background_color":"#ffffff","display":"standalone"}