feat: improve bill flow, user columns, and admin notes UI

Select class before user when creating bills, fix national ID and registered classes display, remove course ratings, fix notification badge, and show Persian datetime in the topbar.

src/views/classes/ClassFormView.vue

@@ -55,6 +55,10 @@
           <label class="font-semibold text-sm">کلاس فعال است</label>
         </div>
 
+        <div class="col-12">
+          <AdminNotesField v-model="form.adminNotes" />
+        </div>
+
         <div class="col-12 flex justify-content-end gap-2 mt-4 pt-3 border-top-1 border-color">
           <Button label="انصراف" text severity="secondary" @click="goBack" />
           <Button type="submit" :label="$t('app.save')" icon="pi pi-check" :loading="isSubmitting" />
@@ -129,6 +133,7 @@ import { userApi } from '@/api/userApi';
 import { usePersianDate } from '@/composables/usePersianDate';
 import { useToast } from '@/composables/useToast';
 import PageHeader from '@/components/common/PageHeader.vue';
+import AdminNotesField from '@/components/common/AdminNotesField.vue';
 import ClassSessionsSection from '@/components/classes/ClassSessionsSection.vue';
 import InputText from 'primevue/inputtext';
 import InputNumber from 'primevue/inputnumber';
@@ -167,7 +172,8 @@ const form = reactive({
   tuitionFee: 0,
   startDate: '',
   endDate: '',
-  isActive: true
+  isActive: true,
+  adminNotes: []
 });
 
 const availableUsers = computed(() => {
@@ -242,7 +248,8 @@ const fetchData = async () => {
         tuitionFee: data.tuitionFee || 0,
         startDate: toJalaliDisplay(data.startDate),
         endDate: toJalaliDisplay(data.endDate),
-        isActive: data.isActive !== false
+        isActive: data.isActive !== false,
+        adminNotes: Array.isArray(data.adminNotes) ? [...data.adminNotes] : []
       });
       students.value = data.students || [];
       if (data.course?.sectionCount) defaultSessionCount.value = data.course.sectionCount;
@@ -277,7 +284,8 @@ const handleSubmit = async () => {
       tuitionFee: form.tuitionFee,
       startDate: toGregorianIso(form.startDate),
       endDate: toGregorianIso(form.endDate),
-      isActive: form.isActive
+      isActive: form.isActive,
+      adminNotes: (form.adminNotes || []).map((n) => String(n).trim()).filter(Boolean)
     };
     if (isEditMode.value) {
       await classApi.update(classId, payload);