feat: implement e-learning classroom page with video player, lesson navigation, progress tracking, and announcements.

Frontend-Learner/components/classroom/VideoPlayer.vue

@@ -124,18 +124,33 @@ const stopYTTracking = () => {
     if (ytInterval) clearInterval(ytInterval);
 };
 
+const destroyYoutubePlayer = () => {
+    stopYTTracking();
+    if (ytPlayer) {
+        try {
+            if (ytPlayer.destroy) ytPlayer.destroy();
+        } catch (e) {
+            console.warn('Error destroying YT player:', e);
+        }
+        ytPlayer = null;
+    }
+};
+
 onMounted(() => {
     if (isYoutube.value) initYoutubeAPI();
 });
 
 onUnmounted(() => {
-    stopYTTracking();
+    destroyYoutubePlayer();
 });
 
 // Watch for src change to re-init
-watch(() => props.src, () => {
-    if (isYoutube.value) {
-        setTimeout(initYoutubeAPI, 500);
+watch(() => props.src, (newSrc, oldSrc) => {
+    if (newSrc !== oldSrc) {
+        destroyYoutubePlayer();
+        if (isYoutube.value) {
+            setTimeout(initYoutubeAPI, 300);
+        }
     }
 });
 

Frontend-Learner/components/layout/AppSidebar.vue

@@ -39,6 +39,12 @@ const navItems = computed(() => [
     isSvg: false
   },
 ]);
+
+const handleNavigate = (path: string) => {
+  if (import.meta.client) {
+    window.location.href = path
+  }
+}
 </script>
 
 <template>
@@ -51,10 +57,11 @@ const navItems = computed(() => [
       <q-item 
         v-for="item in navItems" 
         :key="item.to" 
-        :to="item.to"
         clickable 
         v-ripple
+        @click="handleNavigate(item.to)"
         class="rounded-r-full mr-2 text-slate-700 dark:text-slate-200 hover:bg-slate-100 dark:hover:bg-white/5"
+        :class="{ 'q-router-link--active': $route.path === item.to || ($route.path === '/dashboard' && item.to === '/dashboard') }"
       >
         <q-item-section avatar>
           <q-icon :name="item.icon" />

Frontend-Learner/components/layout/MobileNav.vue

@@ -4,6 +4,11 @@ const navItems = [
   { to: '/browse/discovery', icon: 'explore', label: 'รายการคอร์ส' },
   { to: '/dashboard/my-courses', icon: 'school', label: 'คอร์สของฉัน' }
 ]
+const handleNavigate = (path: string) => {
+  if (import.meta.client) {
+    window.location.href = path
+  }
+}
 </script>
 
 <template>
@@ -14,14 +19,15 @@ const navItems = [
     align="justify"
     dense
   >
-    <q-route-tab
+    <q-tab
       v-for="item in navItems"
       :key="item.to"
-      :to="item.to"
+      @click="handleNavigate(item.to)"
       :icon="item.icon"
       :label="item.label"
       no-caps
       class="py-2"
+      :class="{ 'q-tab--active text-primary': $route.path === item.to }"
     />
   </q-tabs>
 </template>

Frontend-Learner/composables/useAuth.ts

@@ -452,18 +452,28 @@ export const useAuth = () => {
     refreshToken.value = null // ลบ Refresh Token
     user.value = null
     
-    // Reset client-side storage (Keep remembered_email)
+    // Reset client-side storage (Keep remembered_email and theme)
     if (import.meta.client) {
-      // ลบเฉพาะข้อมูลที่ไม่ใช่อีเมลที่จำไว้
       const rememberedEmail = localStorage.getItem('remembered_email')
+      const theme = localStorage.getItem('theme')
+      
       localStorage.clear()
+      
       if (rememberedEmail) {
         localStorage.setItem('remembered_email', rememberedEmail)
       }
+      if (theme) {
+        localStorage.setItem('theme', theme)
+      }
     }
 
-    const router = useRouter()
-    router.push('/auth/login')
+    // Clear and Redirect using hard reload for complete state reset
+    if (import.meta.client) {
+      window.location.href = '/auth/login'
+    } else {
+      const router = useRouter()
+      router.push('/auth/login')
+    }
   }
 
   return {

Frontend-Learner/pages/classroom/learning.vue

@@ -123,6 +123,11 @@ const handleLessonSelect = (lessonId: number) => {
 const loadCourseData = async () => {
   if (!courseId.value) return
   isLoading.value = true
+  // Reset states before loading new course
+  courseData.value = null
+  currentLesson.value = null
+  announcements.value = []
+  
   try {
     const res = await fetchCourseLearningInfo(courseId.value)
     if (res.success) {
@@ -155,15 +160,12 @@ const loadCourseData = async () => {
 const loadLesson = async (lessonId: number) => {
   if (currentLesson.value?.id === lessonId) return
   
-  // Clear previous video state
+  // Clear previous video state & unload component to force reset
   isPlaying.value = false
   videoProgress.value = 0
   currentTime.value = 0
-  if (videoRef.value) {
-      videoRef.value.pause()
-      videoRef.value.currentTime = 0
-  }
-
+  currentLesson.value = null // This will unmount VideoPlayer and hide content
+  
   isLessonLoading.value = true
   try {
     // Optional: Check access first
@@ -450,7 +452,9 @@ onMounted(() => {
 })
 
 onBeforeUnmount(() => {
-
+  // Clear state when leaving the page to ensure fresh start on return
+  courseData.value = null
+  currentLesson.value = null
 })
 </script>
 
@@ -462,13 +466,13 @@ onBeforeUnmount(() => {
       <q-toolbar>
         <q-btn flat round dense icon="menu" class="lg:hidden mr-2 text-slate-900 dark:text-white" @click="toggleSidebar" />
         
-        <NuxtLink 
-          to="/dashboard/my-courses"
-          class="inline-flex items-center gap-2 text-slate-900 dark:text-white hover:text-blue-600 dark:hover:text-blue-300 transition-all font-black text-sm md:text-base group mr-4"
+        <a 
+          href="/dashboard/my-courses"
+          class="inline-flex items-center gap-2 text-slate-900 dark:text-white hover:text-blue-600 dark:hover:text-blue-300 transition-all font-black text-sm md:text-base group mr-4 no-underline"
         >
           <q-icon name="arrow_back" size="24px" class="transition-transform group-hover:-translate-x-1" />
           <span>{{ $t('classroom.backToDashboard') }}</span>
-        </NuxtLink>
+        </a>
         
         <q-toolbar-title class="text-base font-bold text-center lg:text-left truncate text-slate-900 dark:text-white">
            {{ courseData ? getLocalizedText(courseData.course.title) : $t('classroom.loadingTitle') }}
@@ -499,7 +503,7 @@ onBeforeUnmount(() => {
          <div class="w-full max-w-7xl mx-auto p-4 md:p-6 flex-grow">
             <!-- Video Player -->
             <VideoPlayer
-               v-if="currentLesson && videoSrc"
+               v-if="currentLesson && videoSrc && !isLessonLoading"
                ref="videoPlayerComp"
                :src="videoSrc"
                :initialSeekTime="initialSeekTime"
@@ -508,6 +512,15 @@ onBeforeUnmount(() => {
                @loadedmetadata="(d: number) => onVideoMetadataLoaded(d)"
             />
             
+            <!-- Skeleton Loader for Video/Content -->
+            <div v-if="isLessonLoading" class="aspect-video bg-slate-200 dark:bg-slate-800 rounded-2xl animate-pulse flex items-center justify-center mb-6 overflow-hidden relative">
+                <div class="absolute inset-0 bg-gradient-to-br from-slate-200 to-slate-300 dark:from-slate-700 dark:to-slate-800 opacity-50"></div>
+                <div class="z-10 flex flex-col items-center">
+                    <q-spinner size="4rem" color="primary" :thickness="4" />
+                    <p class="mt-4 text-slate-500 dark:text-slate-400 font-bold animate-bounce">{{ $t('common.loading') }}...</p>
+                </div>
+            </div>
+            
              <!-- Lesson Info -->
              <div v-if="currentLesson" class="bg-[var(--bg-surface)] p-6 md:p-8 rounded-3xl shadow-sm border border-[var(--border-color)]">
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