feat: Implement push subscription event handling in AddToCartButton and ProductFilters components; enhance article and category unsubscribe functionality with optional identifiers

src/utils/categoryPush.js

@@ -3,6 +3,8 @@
  */
 
 export {
+  PUSH_SUBSCRIPTIONS_CHANGED_EVENT,
+  emitPushSubscriptionsChanged,
   fetchPushConfiguration,
   registerPushServiceWorker,
   ensurePushSubscription,
@@ -44,13 +46,26 @@ export async function categoryPushSubscribe(kKategorie, subscription) {
 }
 
 /**
+ * POST /api/category/push/unsubscribe — same contract as article: optional `kKategorie` for scoped delete.
+ *
  * @param {string} endpoint
+ * @param {number|string} [kKategorie]
  */
-export async function categoryPushUnsubscribe(endpoint) {
+export async function categoryPushUnsubscribe(endpoint, kKategorie) {
+  const parsed =
+    kKategorie != null && kKategorie !== ""
+      ? typeof kKategorie === "number"
+        ? kKategorie
+        : parseInt(String(kKategorie), 10)
+      : NaN;
+  const body =
+    Number.isFinite(parsed) && parsed > 0
+      ? { endpoint, kKategorie: parsed }
+      : { endpoint };
   const res = await fetch("/api/category/push/unsubscribe", {
     method: "POST",
     headers: { "Content-Type": "application/json" },
-    body: JSON.stringify({ endpoint }),
+    body: JSON.stringify(body),
   });
   const data = await res.json().catch(() => ({}));
   return { ...data, httpOk: res.ok };