fix: show only parent comments as feedback reasons to children

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/FamilyPlanner.Api/Features/Learning/LearningSupport.cs

@@ -140,7 +140,8 @@ internal static class LearningMapper
                 feedback = new LearningItemFeedbackDto(
                     answer.Verdict,
                     answer.AwardedPoints,
-                    attempt.Status == LearningAttemptStatus.InProgress ? null : answer.Reason,
+                    // Nur Kommentare der Eltern; Meldungen der Automatik („Keine Antwort.“) stehen schon im Ergebnis.
+                    attempt.Status != LearningAttemptStatus.InProgress && answer.Grader == LearningGrader.Parent ? answer.Reason : null,
                     visibility.ShowSolution ? item.CorrectAnswer : null,
                     visibility.ShowSolution ? item.Explanation : null);
             }

tests/FamilyPlanner.UnitTests/Learning/LearningMapperTests.cs

@@ -128,11 +128,15 @@ public sealed class LearningMapperTests
     {
         var (set, attempt) = Build(LearningMode.Practice, true, LearningAttemptStatus.InProgress);
         attempt.Answers[0].Reason = ParentReason;
+        attempt.Answers[0].Grader = LearningGrader.Parent;
+        attempt.Answers[1].Reason = "Keine Zahl erkannt."; // Meldung der Automatik: kein Kommentar der Eltern
 
         Assert.DoesNotContain(ParentReason, Json(set, attempt));
 
         attempt.Status = LearningAttemptStatus.Reviewed;
-        Assert.Contains(ParentReason, Json(set, attempt));
+        var json = Json(set, attempt);
+        Assert.Contains(ParentReason, json);
+        Assert.DoesNotContain("Keine Zahl erkannt.", json);
     }
 
     [Fact]