feat: enhance summary display by adding conditional name visibility

public/checkout.html

@@ -41,7 +41,7 @@
           </div>
         </div>
 
-        <div class="summary-item">
+        <div id="summaryNameItem" class="summary-item">
           <span class="summary-icon">👤</span>
           <div class="summary-details">
             <span class="summary-label">Name</span>

public/checkout.js

@@ -7,6 +7,7 @@
   const summaryActivity = document.getElementById("summaryActivity");
   const summaryDate = document.getElementById("summaryDate");
   const summaryName = document.getElementById("summaryName");
+  const summaryNameItem = document.getElementById("summaryNameItem");
   const activityIcon = document.getElementById("activityIcon");
   const checkoutBtn = document.getElementById("checkoutBtn");
 
@@ -25,7 +26,11 @@
   }
 
   summaryActivity.textContent = selectedActivity;
-  summaryName.textContent = selectedName || "Nicht angegeben";
+  if (selectedName && selectedName.trim()) {
+    summaryName.textContent = selectedName;
+  } else {
+    summaryNameItem.classList.add("hidden");
+  }
 
   const dateObj = new Date(`${selectedDate}T00:00:00`);
   const formattedDate = dateObj.toLocaleDateString("de-DE", {