feat: enhance discount handling in financial forms

- Implemented discount and adjustment fields in Bill, Credit Note, Estimate, Invoice, and Receipt forms.
- Created new components for displaying discount and adjustment totals, improving clarity in financial documents.
- Updated utility functions to format discount and adjustment amounts consistently across various forms.
- Enhanced user experience by integrating discount functionality into the form context, allowing for better data management and display.

This update improves the overall functionality and user experience related to discounts in financial transactions.

packages/webapp/src/containers/Sales/Invoices/InvoiceForm/utils.tsx

@@ -11,6 +11,7 @@ import {
   transformToForm,
   repeatValue,
   defaultFastFieldShouldUpdate,
+  formattedAmount,
 } from '@/utils';
 import { ERROR } from '@/constants/errors';
 import { AppToaster } from '@/components';
@@ -318,6 +319,43 @@ export const useInvoiceDiscountAmount = () => {
     : discount;
 };
 
+/**
+ * Retrieves the invoice discount amount formatted.
+ * @returns {string}
+ */
+export const useInvoiceDiscountAmountFormatted = () => {
+  const discountAmount = useInvoiceDiscountAmount();
+  const {
+    values: { currency_code },
+  } = useFormikContext();
+
+  return formattedAmount(discountAmount, currency_code);
+};
+
+/**
+ * Retrieves the invoice adjustment amount.
+ * @returns {number}
+ */
+export const useInvoiceAdjustmentAmount = () => {
+  const { values } = useFormikContext();
+  const adjustment = parseFloat(values.adjustment);
+
+  return adjustment;
+};
+
+/**
+ * Retrieves the invoice adjustment amount formatted.
+ * @returns {string}
+ */
+export const useInvoiceAdjustmentAmountFormatted = () => {
+  const adjustmentAmount = useInvoiceAdjustmentAmount();
+  const {
+    values: { currency_code },
+  } = useFormikContext();
+
+  return formattedAmount(adjustmentAmount, currency_code);
+};
+
 /**
  * Detarmines whether the invoice has foreign customer.
  * @returns {boolean}