Stop reconcile from overwriting edited transaction amounts.

When updating a transaction, skip automatic pending-amount adjustment so
admin edits to amount, due date, and other fields are preserved.

components/payments/paymentService.js

@@ -74,7 +74,7 @@ const emitPaymentStatusChangedIfNeeded = (payment, previousStatus, actorId = nul
   });
 };
 
-const reconcilePendingTransactions = async (payment) => {
+const reconcilePendingTransactions = async (payment, { adjustAmount = true } = {}) => {
   const transactions = await Transaction.find({ payment: payment._id }).lean();
   const remaining = getPayableAmount(payment) - sumPaidTransactions(transactions);
   const pending = await Transaction.find({ payment: payment._id, status: 'pending' }).sort({ dueDate: 1 });
@@ -85,11 +85,13 @@ const reconcilePendingTransactions = async (payment) => {
   }
 
   if (pending.length) {
+    if (adjustAmount) {
       const pendingTotal = pending.reduce((sum, row) => sum + row.amount, 0);
       if (pendingTotal !== remaining) {
         pending[0].amount = remaining;
         await pending[0].save();
       }
+    }
     if (pending.length > 1) {
       await Transaction.deleteMany({ _id: { $in: pending.slice(1).map((row) => row._id) } });
     }
@@ -363,7 +365,8 @@ const updateTransaction = async (transactionId, body, actorId = null) => {
   if (actorId) trx.recordedBy = actorId;
 
   await trx.save();
-  await reconcilePendingTransactions(payment);
+  // Preserve admin-edited amounts; only reconcile balance when recording new payments.
+  await reconcilePendingTransactions(payment, { adjustAmount: false });
   await refreshPaymentTotals(payment);
   emitPaymentStatusChangedIfNeeded(payment, previousStatus, actorId);