feat: добавил поддержку подписки на календарь и экспорт расписания лекций в формате .ics

frontend/src/views/student/DashboardView.vue

@@ -2,6 +2,8 @@
 import { computed, inject, onMounted, ref } from 'vue'
 import { useRouter } from 'vue-router'
 import { useAuthStore } from '@/stores/auth'
+import { usersApi } from '@/api'
+import { downloadFile } from '@/utils/downloadFile'
 import { useLecturesStore } from '@/stores/lectures'
 import { useUserStore } from '@/stores/user'
 import GlassCard from '@/components/ui/GlassCard.vue'
@@ -66,6 +68,16 @@ const levelProgressText = computed(() =>
     : `${userXp.value} XP`,
 )
 
+async function downloadLectureIcs(id: string) {
+  try {
+    const blob = await usersApi.downloadEnrollmentIcs(id)
+    downloadFile(blob, `lecture-${id}.ics`)
+    addToast?.("Файл календаря скачан", "success")
+  } catch (err) {
+    addToast?.(err instanceof Error ? err.message : "Не удалось скачать .ics", "error")
+  }
+}
+
 onMounted(async () => {
   await Promise.all([
     lectures.all.length ? Promise.resolve() : lectures.fetchLectures(),
@@ -125,7 +137,7 @@ async function registerLecture(id: string) {
           <button class="btn-primary" @click="router.push(`/lecture/${nextLecture.id}`)">
             Открыть
           </button>
-          <button class="btn-secondary">Добавить в календарь</button>
+          <button class="btn-secondary" @click="downloadLectureIcs(nextLecture.id)">Скачать .ics</button>
         </div>
       </div>
     </GlassCard>