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>