feat: implement geometry snapping logic for manual road insertion and approved roads topology

apps/web/package-lock.json

@@ -12,6 +12,7 @@
         "axios": "^1.13.6",
         "leaflet": "^1.9.4",
         "lucide-react": "^0.577.0",
+        "maplibre-contour": "^0.1.0",
         "maplibre-gl": "^5.20.2",
         "react": "^19.2.4",
         "react-dom": "^19.2.4"
@@ -2264,6 +2265,11 @@
         "react": "^16.5.1 || ^17.0.0 || ^18.0.0 || ^19.0.0"
       }
     },
+    "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=="
+    },
     "node_modules/maplibre-gl": {
       "version": "5.20.2",
       "resolved": "https://registry.npmjs.org/maplibre-gl/-/maplibre-gl-5.20.2.tgz",