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/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.*
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/versions
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.pnpm-debug.log*
+
+# env files (can opt-in for committing if needed)
+.env*
+
+# vercel
+.vercel
+
+# typescript
+*.tsbuildinfo
+next-env.d.ts