Use freehand polygon tool for a common repo

package.json

@@ -50,6 +50,7 @@
     "govuk-svelte": "github:acteng/govuk-svelte",
     "humanize-string": "^3.0.0",
     "js-cookie": "^3.0.5",
+    "maplibre-draw-polygon": "github:dabreegster/maplibre-draw-polygon",
     "maplibre-gl": "^4.0.2",
     "read-excel-file": "^5.7.1",
     "route-snapper": "^0.3.0",

src/lib/draw/polygon/PolygonControls.svelte

@@ -1,7 +1,7 @@
 <script lang="ts">
   import { polygonTool } from "lib/draw/stores";
   import { SecondaryButton } from "govuk-svelte";
-  import { undoLength } from "./stores";
+  import { undoLength } from "maplibre-draw-polygon";
 
   function undo() {
     $polygonTool!.undo();

src/lib/draw/polygon/PolygonToolLayer.svelte

@@ -2,7 +2,7 @@
   import { circleRadius, colors } from "colors";
   import { isLine, isPoint, isPolygon, layerId } from "lib/maplibre";
   import { CircleLayer, FillLayer, GeoJSON, LineLayer } from "svelte-maplibre";
-  import { polygonToolGj } from "./stores";
+  import { polygonToolGj } from "maplibre-draw-polygon";
 </script>
 
 <GeoJSON data={$polygonToolGj}>