fix: Refactors variable declarations to fix region tag. (#719)

Change-Id: Ib21c1d536cb81d79e476ba25f9317afbe772d476

Author: willum070

samples/deckgl-polygon/index.ts

@@ -4,6 +4,11 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 /* [START maps_deckgl_polygon] */
+// Initialize and add the map
+let map: google.maps.Map;
+let polygonLayer: deck.PolygonLayer; // Declare polygonLayer outside for button access
+let googleMapsOverlay: deck.GoogleMapsOverlay; // Declare googleMapsOverlay outside for button access
+
 // Declare global namespace for Deck.gl to satisfy TypeScript compiler
 declare namespace deck {
   class PolygonLayer {
@@ -20,11 +25,6 @@ declare namespace deck {
   // Add other Deck.gl types used globally if needed
 }
 
-// Initialize and add the map
-let map: google.maps.Map;
-let polygonLayer: deck.PolygonLayer; // Declare polygonLayer outside for button access
-let googleMapsOverlay: deck.GoogleMapsOverlay; // Declare googleMapsOverlay outside for button access
-
 async function initMap(): Promise<void> {
   // Progress bar logic moved from index.html
   var progress, progressDiv = document.querySelector(".mdc-linear-progress");