fix: new colorForAnswer for EstimationQuestions

QuizApp/Views/QuizView.swift

@@ -78,6 +78,7 @@ struct QuizView: View {
                     ) { gained in
                         viewModel.score += gained
                         viewModel.answeredCount += 1
+                        viewModel.selectedAnswers[viewModel.currentQuestionIndex] = 0
                         isAnswered = true
                     }
                     
@@ -186,13 +187,24 @@ struct QuizView: View {
         }
         
         guard index < viewModel.selectedAnswers.count,
-              let selected = viewModel.selectedAnswers[index],
               index < viewModel.questions.count else {
             return Color.gray.opacity(0.3) // unbeantwortet
         }
         
-        let correct = viewModel.questions[index].correctAnswer
+        // Prüfen ob die Frage beantwortet wurde
-        return selected == correct ? .green : .red
+        let question = viewModel.questions[index]
+        if question.isEstimation {
+            // Bei Estimation-Fragen: Grün wenn beantwortet
+            return viewModel.selectedAnswers[index] != nil ? .green : Color.gray.opacity(0.3)
+        } else {
+            // Bei Multiple-Choice: Grün wenn richtig, rot wenn falsch
+            if let selected = viewModel.selectedAnswers[index] {
+                let correct = question.correctAnswer
+                return selected == correct ? .green : .red
+            } else {
+                return Color.gray.opacity(0.3) // unbeantwortet
+            }
+        }
     }
     
     private func saveScore() {