refactor: simplify ChildEntry from object to union type

Change ChildEntry from { type: 'layer'|'popup'|'tooltip' } to just
the union string, eliminating the wrapper object. Update Map.set calls
in createChildRegisterHandler and destructuring in leaflet-layer-group,
leaflet-feature-group, and leaflet-geojson disconnectedCallback.

src/components/leaflet-feature-group.ts

@@ -15,10 +15,10 @@ export class LeafletFeatureGroup extends HTMLElement {
   }
 
   disconnectedCallback() {
-    for (const [el, entry] of getChildren(this) ?? []) {
-      if (entry.type === 'popup') this.#obj?.unbindPopup();
-      else if (entry.type === 'tooltip') this.#obj?.unbindTooltip();
-      else if (entry.type === 'layer') this.#obj?.removeLayer(el as unknown as Layer);
+    for (const [el, type] of getChildren(this) ?? []) {
+      if (type === 'popup') this.#obj?.unbindPopup();
+      else if (type === 'tooltip') this.#obj?.unbindTooltip();
+      else if (type === 'layer') this.#obj?.removeLayer(el as unknown as Layer);
     }
     unregisterChildren(this);
     this.#obj?.remove();

src/components/leaflet-geojson.ts

@@ -37,10 +37,10 @@ export class LeafletGeoJSON extends WithProps(HTMLElement, PROPS) {
   }
 
   disconnectedCallback() {
-    for (const [el, entry] of getChildren(this) ?? []) {
-      if (entry.type === 'popup') this.#obj?.unbindPopup();
-      else if (entry.type === 'tooltip') this.#obj?.unbindTooltip();
-      else if (entry.type === 'layer') this.#obj?.removeLayer(el as unknown as Layer);
+    for (const [el, type] of getChildren(this) ?? []) {
+      if (type === 'popup') this.#obj?.unbindPopup();
+      else if (type === 'tooltip') this.#obj?.unbindTooltip();
+      else if (type === 'layer') this.#obj?.removeLayer(el as unknown as Layer);
     }
     unregisterChildren(this);
     this.#obj?.remove();

src/components/leaflet-layer-group.ts

@@ -15,10 +15,10 @@ export class LeafletLayerGroup extends HTMLElement {
   }
 
   disconnectedCallback() {
-    for (const [el, entry] of getChildren(this) ?? []) {
-      if (entry.type === 'popup') this.#obj?.unbindPopup();
-      else if (entry.type === 'tooltip') this.#obj?.unbindTooltip();
-      else if (entry.type === 'layer') this.#obj?.removeLayer(el as unknown as Layer);
+    for (const [el, type] of getChildren(this) ?? []) {
+      if (type === 'popup') this.#obj?.unbindPopup();
+      else if (type === 'tooltip') this.#obj?.unbindTooltip();
+      else if (type === 'layer') this.#obj?.removeLayer(el as unknown as Layer);
     }
     unregisterChildren(this);
     this.#obj?.remove();

src/core/register.ts

@@ -33,9 +33,7 @@ export function emitIconChanged(el: HTMLElement, icon: Icon | null | undefined)
 
 // Tracks whether a child registered as a plain layer, popup, or tooltip --
 // used by the controls panel and by cleanup logic.
-type ChildEntry = {
-  type: 'layer' | 'popup' | 'tooltip';
-};
+type ChildEntry = 'layer' | 'popup' | 'tooltip';
 
 // Builds the event handler for a given parent layer. On each
 // leaflet-register event from a descendant, it checks the Leaflet type:
@@ -49,15 +47,15 @@ function createChildRegisterHandler(layer: Layer, children: Map<HTMLElement, Chi
     if (obj instanceof Popup) {
       e.stopPropagation();
       layer.bindPopup(obj);
-      children.set(el, { type: 'popup' });
+      children.set(el, 'popup');
     } else if (obj instanceof Tooltip) {
       e.stopPropagation();
       layer.bindTooltip(obj);
-      children.set(el, { type: 'tooltip' });
+      children.set(el, 'tooltip');
     } else if (obj instanceof Layer && 'addLayer' in layer) {
       e.stopPropagation();
       (layer as unknown as LayerGroup).addLayer(obj);
-      children.set(el, { type: 'layer' });
+      children.set(el, 'layer');
     }
   };
 }