feat: Implement 'My Courses' dashboard, including course cards, classroom learning, and quiz pages.

Frontend-Learner/pages/classroom/quiz.vue

@@ -50,13 +50,18 @@ const submitQuiz = (auto = false) => {
   }
 }
 
+const route = useRoute()
+
 const confirmExit = () => {
+  const courseId = route.query.course_id
+  const target = courseId ? `/classroom/learning?course_id=${courseId}` : '/classroom/learning'
+
   if (currentScreen.value === 'taking') {
     if (confirm('คุณกำลังทำแบบทดสอบอยู่ หากออกตอนนี้ความคืบหน้าจะหายไป ยืนยันที่จะออก?')) {
-        router.push('/classroom/learning')
+        router.push(target)
     }
   } else {
-    router.push('/classroom/learning')
+    router.push(target)
   }
 }