flagging and exclude

packages/practice_engine/lib/logic/attempt_service.dart

@@ -27,11 +27,14 @@ class AttemptService {
     final size = attemptSize ?? deck.config.defaultAttemptSize;
     
     // Filter candidates based on includeKnownInAttempts setting
-    // Use override parameter if provided, otherwise use config
     final shouldIncludeKnown = includeKnown ?? deck.config.includeKnownInAttempts;
-    final candidates = shouldIncludeKnown
-        ? deck.questions
+    var candidates = shouldIncludeKnown
+        ? List<Question>.from(deck.questions)
         : deck.questions.where((q) => !q.isKnown).toList();
+    // Exclude flagged questions when config says so
+    if (deck.config.excludeFlaggedQuestions) {
+      candidates = candidates.where((q) => !q.isFlagged).toList();
+    }
     
     final selected = _selector.selectQuestions(
       candidates: candidates,