bug fix for atemschutz

frontend/src/pages/Atemschutz.tsx

@@ -281,10 +281,19 @@ function Atemschutz() {
       'leistungstest_datum',
       'leistungstest_gueltig_bis',
     ];
-    if (!dialogContentRef.current) return result;
+    if (!dialogContentRef.current) {
+      // Fallback: read from React state
+      for (const name of dateFieldNames) {
+        result[name] = normalizeDate((form as any)[name] || undefined);
+      }
+      return result;
+    }
     for (const name of dateFieldNames) {
       const input = dialogContentRef.current.querySelector(`input[name="${name}"]`) as HTMLInputElement | null;
-      result[name] = normalizeDate(input?.value || undefined);
+      const domVal = input?.value || '';
+      const stateVal = (form as any)[name] || '';
+      // Use DOM value if available, otherwise fall back to React state
+      result[name] = normalizeDate(domVal || stateVal || undefined);
     }
     return result;
   };
@@ -303,7 +312,15 @@ function Atemschutz() {
       const dates = readDatesFromDOM();
 
       // DEBUG: remove after confirming it works
-      alert('DOM dates:\n' + JSON.stringify(dates, null, 2));
+      const debugInfo: Record<string, string> = {};
+      const ref = dialogContentRef.current;
+      if (ref) {
+        for (const n of ['lehrgang_datum', 'leistungstest_gueltig_bis']) {
+          const el = ref.querySelector(`input[name="${n}"]`) as HTMLInputElement | null;
+          debugInfo[n] = el ? `found, value="${el.value}"` : 'NOT FOUND in DOM';
+        }
+      }
+      alert('DOM dates:\n' + JSON.stringify(dates, null, 2) + '\n\nDebug:\n' + JSON.stringify(debugInfo, null, 2));
 
       if (editingId) {
         const payload: UpdateAtemschutzPayload = {