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/Estimates/constants.ts

@@ -254,18 +254,27 @@ export interface EstimatePdfBrandingAttributes {
   companyAddress: string;
   billedToLabel: string;
 
+  // # Total
   total: string;
   totalLabel: string;
   showTotal: boolean;
 
+  // # Discount
+  discount: string;
+  showDiscount: boolean;
+  discountLabel: string;
+
+  // # Subtotal
   subtotal: string;
   subtotalLabel: string;
   showSubtotal: boolean;
 
+  // # Customer Note
   showCustomerNote: boolean;
   customerNote: string;
   customerNoteLabel: string;
 
+  // # Terms & Conditions
   showTermsConditions: boolean;
   termsConditions: string;
   termsConditionsLabel: string;

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

@@ -20,6 +20,10 @@ export const transformEstimateToPdfTemplate = (
     customerNote: estimate.note,
     termsConditions: estimate.termsConditions,
     customerAddress: contactAddressTextFormat(estimate.customer),
+    discount: estimate.discountAmountFormatted,
+    discountLabel: estimate.discountPercentageFormatted
+      ? `Discount [${estimate.discountPercentageFormatted}]`
+      : 'Discount',
   };
 };