fix: format prices in notifications, change partial payment label, and add session holding notify API

utils/paymentAmount.js

@@ -44,6 +44,15 @@ const sumPaidTransactions = (transactions = []) => {
   }, 0);
 };
 
+const formatPrice = (value) => {
+  if (value === null || value === undefined || value === '') return '';
+  const num = typeof value === 'number' ? value : Number(String(value).replace(/,/g, ''));
+  if (!Number.isNaN(num) && Number.isFinite(num)) {
+    return num.toLocaleString('en-US');
+  }
+  return String(value);
+};
+
 const remainingPayable = (payment = {}, transactions = []) => {
   return Math.max(0, getPayableAmount(payment) - sumPaidTransactions(transactions));
 };
@@ -53,6 +62,7 @@ module.exports = {
   getPayableAmount,
   normalizeDiscount,
   sanitizeNotes,
+  formatPrice,
   rialsToToman,
   isPaidTransaction,
   isCancelledTransaction,