feat: Add Retake Full Quiz option to quiz results screen

src/components/quizzes/QuizResults.tsx

@@ -89,6 +89,16 @@ export function QuizResults({ quiz, attempt, onRetake, onClose }: QuizResultsPro
               Retake Missed ({missedIds.length})
             </button>
           )}
+
+          <button
+            onClick={() => {
+              const allIds = quiz.questions.map((q: any) => q.id).sort(() => Math.random() - 0.5);
+              onRetake(allIds);
+            }}
+            className="px-6 py-2.5 rounded-lg border border-primary text-primary font-medium hover:bg-primary/5 transition-all duration-200 cursor-pointer"
+          >
+            Retake Full Quiz
+          </button>
         </div>
       </div>