fix(dashboard): fix class edit page hang and move session notify action to class edit page

The class edit page hung/looped because ClassSessionsSection.vue still
referenced a removed todayJalali() helper in the template, which threw a
render error on every reactive update. Switch both usages to the
getTodayJalali() composable function.

Also remove the duplicate "اطلاع‌رسانی برگزاری جلسه" notify button/dialog
from SessionListView.vue since the same action already exists per-session
inside the class edit page.

src/components/classes/ClassSessionsSection.vue

@@ -232,7 +232,7 @@
       <div v-for="(session, index) in manualSessions" :key="index" class="grid align-items-center mb-2 p-2 border-round surface-ground">
         <div class="col-12 sm:col-1 text-center font-bold">#{{ toPersianDigits(index + 1) }}</div>
         <div class="col-12 sm:col-3">
-          <InputText v-model="session.date" :placeholder="`تاریخ (${todayJalali()})`" class="w-full text-sm" />
+          <InputText v-model="session.date" :placeholder="`تاریخ (${getTodayJalali()})`" class="w-full text-sm" />
         </div>
         <div class="col-6 sm:col-2">
           <InputText v-model="session.startTime" placeholder="ساعت شروع" class="w-full text-sm" dir="ltr" />
@@ -261,7 +261,7 @@
           label="افزودن ردیف"
           icon="pi pi-plus"
           text
-          @click="manualSessions.push({ date: todayJalali(), startTime: '19:00', endTime: '20:30', topic: '' })"
+          @click="manualSessions.push({ date: getTodayJalali(), startTime: '19:00', endTime: '20:30', topic: '' })"
         />
         <Button label="ثبت جلسات" icon="pi pi-save" severity="success" :loading="isSaving" @click="submitManualSessions" />
       </div>

src/views/sessions/SessionListView.vue

@@ -131,19 +131,6 @@
               />
             </PermissionGate>
 
-            <PermissionGate permission="sessions:read">
-              <Button
-                icon="pi pi-send"
-                text
-                rounded
-                size="small"
-                severity="info"
-                v-tooltip.top="'اطلاع‌رسانی برگزاری جلسه'"
-                :loading="notifyingSessionId === (data._id || data.id)"
-                @click="openNotifyHoldingDialog(data)"
-              />
-            </PermissionGate>
-
             <PermissionGate permission="sessions:update">
               <Button icon="pi pi-pencil" text rounded size="small" severity="warning" v-tooltip.top="'ویرایش'" @click="$router.push(`/sessions/edit/${data._id || data.id}`)" />
             </PermissionGate>
@@ -163,34 +150,6 @@
       :message="bulkDeleteMessage"
       @confirm="handleDeleteConfirm"
     />
-
-    <Dialog
-      v-model:visible="notifyDialogVisible"
-      header="اطلاع‌رسانی برگزاری جلسه"
-      modal
-      :style="{ width: '450px' }"
-    >
-      <div class="flex flex-column gap-3 py-2">
-        <p class="m-0 line-height-3 text-sm">
-          آیا از ارسال پیامک برگزاری جلسه طبق برنامه به دانشجویان کلاس «{{ selectedSessionForNotify?.class?.name || selectedSessionForNotify?.course?.title || '' }}» اطمینان دارید؟
-        </p>
-        <div v-if="selectedSessionForNotify" class="surface-100 p-3 border-round text-xs flex flex-column gap-1">
-          <div><strong>موضوع جلسه:</strong> {{ selectedSessionForNotify.topic || 'طبق برنامه' }}</div>
-          <div><strong>تاریخ:</strong> {{ formatJalali(selectedSessionForNotify.day || selectedSessionForNotify.date) }}</div>
-          <div><strong>ساعت:</strong> {{ selectedSessionForNotify.startTime || '—' }} تا {{ selectedSessionForNotify.endTime || '—' }}</div>
-        </div>
-      </div>
-      <template #footer>
-        <Button label="انصراف" text severity="secondary" @click="notifyDialogVisible = false" />
-        <Button
-          label="ارسال پیامک"
-          icon="pi pi-send"
-          severity="info"
-          :loading="isNotifying"
-          @click="handleSendSessionHolding"
-        />
-      </template>
-    </Dialog>
   </div>
 </template>
 
@@ -211,7 +170,6 @@ import Column from 'primevue/column';
 import Tag from 'primevue/tag';
 import Select from 'primevue/select';
 import Dropdown from 'primevue/select';
-import Dialog from 'primevue/dialog';
 
 const { formatJalali, toPersianDigits } = usePersianDate();
 const { showSuccess, showError } = useToast();
@@ -242,35 +200,6 @@ const selectedSession = ref(null);
 const bulkDeleteMode = ref(false);
 const isDeleting = ref(false);
 
-const notifyDialogVisible = ref(false);
-const selectedSessionForNotify = ref(null);
-const notifyingSessionId = ref(null);
-const isNotifying = ref(false);
-
-const openNotifyHoldingDialog = (session) => {
-  selectedSessionForNotify.value = session;
-  notifyDialogVisible.value = true;
-};
-
-const handleSendSessionHolding = async () => {
-  if (!selectedSessionForNotify.value) return;
-  const id = selectedSessionForNotify.value._id || selectedSessionForNotify.value.id;
-  notifyingSessionId.value = id;
-  isNotifying.value = true;
-  try {
-    const res = await sessionApi.notifyHolding(id);
-    const count = res.data?.sentCount || res.data?.totalStudents || '';
-    showSuccess(`پیامک برگزاری جلسه با موفقیت به ${count ? toPersianDigits(count) + ' نفر از ' : ''}دانشجویان ارسال شد`);
-    notifyDialogVisible.value = false;
-    selectedSessionForNotify.value = null;
-  } catch (err) {
-    showError(err);
-  } finally {
-    notifyingSessionId.value = null;
-    isNotifying.value = false;
-  }
-};
-
 const statusOptions = [
   { label: 'طبق برنامه', value: 'scheduled' },
   { label: 'برگزار شده', value: 'held' },