feat: improve filters and class pricing controls in dashboard

Add session class filter, distinct partial payment tag, richer notifications list, class discount/frontend toggles, and remove unused course discount column.

src/views/sessions/SessionListView.vue

@@ -2,9 +2,22 @@
 <template>
   <div class="session-list-view">
     <PageHeader :title="$t('sessions.title')" :subtitle="$t('sessions.subtitle')">
-      <PermissionGate permission="sessions:create">
-        <Button :label="$t('sessions.addSession')" icon="pi pi-plus" @click="$router.push('/sessions/create')" />
-      </PermissionGate>
+      <div class="flex flex-wrap gap-2 align-items-center">
+        <Dropdown
+          v-model="selectedClassId"
+          :options="classesList"
+          optionLabel="name"
+          optionValue="_id"
+          placeholder="فیلتر کلاس"
+          showClear
+          filter
+          class="w-16rem text-sm"
+          @change="onClassFilter"
+        />
+        <PermissionGate permission="sessions:create">
+          <Button :label="$t('sessions.addSession')" icon="pi pi-plus" @click="$router.push('/sessions/create')" />
+        </PermissionGate>
+      </div>
     </PageHeader>
 
     <DataTableWrapper
@@ -146,6 +159,7 @@ import { useDataTable } from '@/composables/useDataTable';
 import { usePersianDate } from '@/composables/usePersianDate';
 import { useToast } from '@/composables/useToast';
 import { sessionApi } from '@/api/sessionApi';
+import { classApi } from '@/api/classApi';
 import PageHeader from '@/components/common/PageHeader.vue';
 import DataTableWrapper from '@/components/common/DataTableWrapper.vue';
 import ConfirmDeleteDialog from '@/components/common/ConfirmDeleteDialog.vue';
@@ -155,10 +169,14 @@ import Button from 'primevue/button';
 import Column from 'primevue/column';
 import Tag from 'primevue/tag';
 import Select from 'primevue/select';
+import Dropdown from 'primevue/select';
 
 const { formatJalali, toPersianDigits } = usePersianDate();
 const { showSuccess, showError } = useToast();
 
+const classesList = ref([]);
+const selectedClassId = ref(null);
+
 const {
   items,
   totalCount,
@@ -167,7 +185,8 @@ const {
   loadData,
   onPageChange,
   onSort,
-  onSearch
+  onSearch,
+  setFilter
 } = useDataTable(sessionApi.getAll, {
   sortBy: 'day',
   sortOrder: 'asc'
@@ -249,7 +268,20 @@ const applyBulkStatus = async () => {
   }
 };
 
+const onClassFilter = () => setFilter('classId', selectedClassId.value || '');
+
+const fetchClasses = async () => {
+  try {
+    const res = await classApi.getAll({ limit: 200, sortBy: 'name', sortOrder: 'asc' });
+    const data = res.data || res;
+    classesList.value = Array.isArray(data) ? data : (data.data || []);
+  } catch (err) {
+    console.warn('Failed to load classes for filter:', err);
+  }
+};
+
 onMounted(() => {
+  fetchClasses();
   loadData();
 });
 </script>