feat: Implement comprehensive quiz functionality, new browse pages, and a classroom learning page with i18n support.

Frontend-Learner/pages/browse/discovery.vue

@@ -237,7 +237,7 @@ onMounted(() => {
                 v-else
                 class="flex flex-col items-center justify-center py-20 bg-slate-50 dark:bg-slate-800/50 rounded-3xl border-2 border-dashed border-slate-200 dark:border-slate-700"
               >
-                <div class="text-6xl mb-4">🔍</div>
+                
                 <h3 class="text-xl font-bold text-slate-900 dark:text-white mb-2">{{ $t('discovery.emptyTitle') }}</h3>
                 <p class="text-slate-500 dark:text-slate-400 text-center max-w-md">
                   {{ $t('discovery.emptyDesc') }}