feat: add discount functionality to sales and purchase transactions

- Introduced discount_type and discount fields in Bills and SalesReceipts controllers.
- Updated database migrations to include discount and discount_type in estimates and credit notes tables.
- Enhanced SaleReceipt and SaleEstimate models to support discount attributes.
- Implemented formatting for discount amounts in transformers and PDF templates.
- Updated email templates to display discount information.

This commit enhances the handling of discounts across various transaction types, improving the overall functionality and user experience.

packages/server/src/services/Sales/Receipts/utils.ts

@@ -8,8 +8,8 @@ export const transformReceiptToBrandingTemplateAttributes = (
   saleReceipt: ISaleReceipt
 ): Partial<ISaleReceiptBrandingTemplateAttributes> => {
   return {
-    total: saleReceipt.formattedAmount,
-    subtotal: saleReceipt.formattedSubtotal,
+    total: saleReceipt.totalFormatted,
+    subtotal: saleReceipt.subtotalFormatted,
     lines: saleReceipt.entries?.map((entry) => ({
       item: entry.item.name,
       description: entry.description,
@@ -19,6 +19,10 @@ export const transformReceiptToBrandingTemplateAttributes = (
     })),
     receiptNumber: saleReceipt.receiptNumber,
     receiptDate: saleReceipt.formattedReceiptDate,
+    discount: saleReceipt.discountAmountFormatted,
+    discountLabel: saleReceipt.discountPercentageFormatted
+      ? `Discount [${saleReceipt.discountPercentageFormatted}]`
+      : 'Discount',
     customerAddress: contactAddressTextFormat(saleReceipt.customer),
   };
 };