refactor(FE-208,212,213): add action field to staff approval request payloads and implement rejection handling in PurchaseOrderDetail

src/types/api/purchase/purchase.d.ts

@@ -79,6 +79,7 @@ export type CreatePurchaseRequestPayload = {
 };
 
 export type CreateStaffApprovalRequestPayload = {
+  action: 'APPROVED' | 'REJECTED';
   notes?: string | null;
   items: {
     product_id: number;
@@ -90,6 +91,7 @@ export type CreateStaffApprovalRequestPayload = {
 };
 
 export type UpdateStaffApprovalRequestPayload = {
+  action: 'APPROVED' | 'REJECTED';
   notes?: string | null;
   items: {
     purchase_item_id: number;