Add supply purchase order workflow

src/types.ts

@@ -454,6 +454,36 @@ export interface SupplyFabricPlan {
   updatedAt: string;
 }
 
+export type SupplyPurchaseOrderStatus = 'draft' | 'sent' | 'approved' | 'received' | 'canceled';
+
+export interface SupplyPurchaseOrderItem {
+  id: number;
+  material: string;
+  quantity: number;
+  unit: string;
+  unitCost: number | null;
+}
+
+export interface SupplyPurchaseOrder {
+  id: number;
+  number: string;
+  supplier: string;
+  status: SupplyPurchaseOrderStatus;
+  expectedDate: string | null;
+  notes: string;
+  total: number;
+  items: SupplyPurchaseOrderItem[];
+  createdAt: string;
+  updatedAt: string;
+}
+
+export type SupplyPurchaseOrderPayload = {
+  supplier: string;
+  expectedDate?: string | null;
+  notes?: string;
+  items: Array<{ material: string; quantity: number; unit?: string; unitCost?: number | null }>;
+};
+
 export interface SupplyPurchaseNeed {
   material: string;
   materialKey: string;