Add interactive 3D Globe tab to Locations using cobe WebGL

- Magic UI Globe component with auto-rotation and drag interaction
- Dark/light mode reactive (base color, glow, brightness)
- Country markers from visitor data using existing centroids
- Brand orange (#FD5E0F) marker color matching DottedMap

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -19,6 +19,7 @@
     "@stripe/react-stripe-js": "^5.6.0",
     "@stripe/stripe-js": "^8.7.0",
     "axios": "^1.13.2",
+    "cobe": "^0.6.5",
     "country-flag-icons": "^1.6.4",
     "d3-scale": "^4.0.2",
     "framer-motion": "^12.23.26",