Refactor error and confirmation handling in membership application management; replace alerts with modal dialogs for improved user experience. Update application status to 'approved' for a new member and add corresponding data to JSON files.

server/data/membership-applications/1761225852269.json

@@ -0,0 +1,17 @@
+{
+  "id": "1761225852269",
+  "timestamp": "2025-10-23T13:24:12.319Z",
+  "status": "pending",
+  "metadata": {
+    "mitgliedschaftsart": "aktiv",
+    "isVolljaehrig": true,
+    "pdfGenerated": true
+  },
+  "personalData": {
+    "nachname": "A",
+    "vorname": "B",
+    "email": "tsschulz@gmx.net",
+    "telefon_privat": "01795094148",
+    "telefon_mobil": "0179 5094148"
+  }
+}