feat(FE-311): Add rejection modals and accept handler

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

@@ -105,7 +105,7 @@ export type CreateManagerApprovalRequestPayload = {
 
 export type CreateAcceptApprovalRequestPayload = {
   action: 'APPROVED' | 'REJECTED';
-  notes?: string;
+  notes?: string | null;
   items: {
     purchase_item_id: number;
     received_date: string;