Fix local Three.js module resolution in MapLibre demo.

This vendors BufferGeometryUtils, rewires GLTFLoader imports to local paths, and adds an import map fallback so bare three specifiers resolve correctly in browser.

Made-with: Cursor

web/maplibre-demo.html

@@ -138,6 +138,14 @@
     </div>
 
     <script src="./vendor/maplibre/maplibre-gl.js"></script>
+    <script type="importmap">
+      {
+        "imports": {
+          "three": "./vendor/three/three.module.js",
+          "three/": "./vendor/three/"
+        }
+      }
+    </script>
     <script type="module" src="./maplibre-demo.js"></script>
   </body>
 </html>

web/vendor/three/GLTFLoader.js

@@ -65,7 +65,7 @@ import {
 	SRGBColorSpace,
 	InstancedBufferAttribute
 } from './three.module.js';
-import { toTrianglesDrawMode } from '../utils/BufferGeometryUtils.js';
+import { toTrianglesDrawMode } from './utils/BufferGeometryUtils.js';
 
 class GLTFLoader extends Loader {