Add custom activity support and clear booking data on submission

public/checkout.js

@@ -10,7 +10,12 @@
   const activityIcon = document.getElementById("activityIcon");
   const checkoutBtn = document.getElementById("checkoutBtn");
 
-  const selectedActivity = localStorage.getItem("selectedActivity");
+  function cleanPrefix(str) {
+    if (!str) return "";
+    return str.replace(/^(Etwas eigenes|Sonstiges):\s*/i, "");
+  }
+
+  const selectedActivity = cleanPrefix(localStorage.getItem("selectedActivity"));
   const selectedDate = localStorage.getItem("selectedDate");
   const selectedName = localStorage.getItem("selectedName");
 
@@ -57,8 +62,12 @@
     checkoutBtn.textContent = "Wird übermittelt... 💌";
 
     const payload = {
-      activity: selectedActivity,
-      activities: storedActivities,
+      activity: cleanPrefix(selectedActivity),
+      activities: storedActivities.map((a) => ({
+        ...a,
+        name: cleanPrefix(a.name),
+        customDescription: cleanPrefix(a.customDescription || a.name),
+      })),
       date: selectedDate,
       dateType: localStorage.getItem("selectedDateType") || "long",
       name: selectedName,
@@ -79,13 +88,9 @@
       })
       .then((data) => {
         if (data.success) {
-          try {
-            const localBooked = JSON.parse(localStorage.getItem("bookedDates") || "[]");
-            if (!localBooked.includes(selectedDate)) {
-              localBooked.push(selectedDate);
-              localStorage.setItem("bookedDates", JSON.stringify(localBooked));
-            }
-          } catch (e) {}
+          // Alle lokal gespeicherten Daten (inkl. bookedDates und ausgewählter Werte) leeren,
+          // damit bei der nächsten Buchung alles frisch geladen / neu ausgewählt wird.
+          localStorage.clear();
 
           summarySection.classList.add("hidden");
           if (backLink) {