wip: contour overlay — broken, needs review

package-lock.json

@@ -12,6 +12,7 @@
         "@dnd-kit/sortable": "^10.0.0",
         "@dnd-kit/utilities": "^3.2.2",
         "lucide-react": "^1.8.0",
+        "maplibre-contour": "^0.1.0",
         "maplibre-gl": "^5.23.0",
         "opening_hours": "^3.12.0",
         "pmtiles": "^4.4.1",
@@ -2685,6 +2686,12 @@
         "@jridgewell/sourcemap-codec": "^1.5.5"
       }
     },
+    "node_modules/maplibre-contour": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/maplibre-contour/-/maplibre-contour-0.1.0.tgz",
+      "integrity": "sha512-H8muT7JWYE4oLbFv7L2RSbIM1NOu5JxjA9P/TQqhODDnRChE8ENoDkQIWOKgfcKNU77ypLk2ggGoh4/pt4UPLA==",
+      "license": "BSD-3-Clause"
+    },
     "node_modules/maplibre-gl": {
       "version": "5.23.0",
       "resolved": "https://registry.npmjs.org/maplibre-gl/-/maplibre-gl-5.23.0.tgz",