fix: add unregister mechanism for map icon updates to prevent memory leaks during component unmount

src/uhm/components/map/useMapInstance.ts

@@ -3,6 +3,7 @@ import maplibregl from "maplibre-gl";
 import { MAP_MAX_ZOOM, MAP_MIN_ZOOM } from "@/uhm/lib/map/constants";
 import { clampNumber, roundZoom } from "./mapUtils";
 import { getBaseMapStyle } from "./useMapLayers";
+import { unregisterMapFromIconUpdates } from "@/uhm/lib/map/styles/geotypeLayers";
 
 const MAP_PROJECTION_STORAGE_KEY = "uhm:mapProjection";
 
@@ -79,6 +80,7 @@ export function useMapInstance() {
                 if (mapRef.current === map) {
                     mapRef.current = null;
                 }
+                unregisterMapFromIconUpdates(map);
                 map.remove();
             };
         } catch (err) {

src/uhm/lib/map/styles/geotypeLayers.ts

@@ -1,6 +1,6 @@
 import maplibregl from "maplibre-gl";
 export const TYPE_MATCH_EXPR: maplibregl.ExpressionSpecification = ["coalesce", ["get", "type"], ["get", "entity_type_id"], ""];
-export { ensurePointGeotypeIcons } from "./shared/pointStyle";
+export { ensurePointGeotypeIcons, unregisterMapFromIconUpdates } from "./shared/pointStyle";
 
 import { getDefenseLineLayers } from "./geotypes/defense_line";
 import { getMilitaryRouteLayers } from "./geotypes/military_route";

src/uhm/lib/map/styles/shared/pointStyle.ts

@@ -178,6 +178,10 @@ const preloadedImages: Record<string, HTMLImageElement> = {};
 const loadedImageKeys = new Set<string>();
 const mapsToUpdate = new Set<maplibregl.Map>();
 
+export function unregisterMapFromIconUpdates(map: maplibregl.Map) {
+    mapsToUpdate.delete(map);
+}
+
 function preloadPointIcons() {
     if (typeof window === "undefined" || typeof document === "undefined") return;
     for (const [typeId, path] of Object.entries(POINT_GEOTYPE_ICON_PATHS)) {