feat: 新增租戶品牌客製化系統（Logo、主色系）、修正 hardcoded 顏色為 CSS 變數

resources/js/Pages/PurchaseOrder/Show.tsx

@@ -38,7 +38,7 @@ export default function ViewPurchaseOrderPage({ order }: Props) {
                     <div className="flex items-center justify-between mb-6">
                         <div>
                             <h1 className="text-2xl font-bold text-grey-0 flex items-center gap-2">
-                                <ShoppingCart className="h-6 w-6 text-[#01ab83]" />
+                                <ShoppingCart className="h-6 w-6 text-primary-main" />
                                 查看採購單
                             </h1>
                             <p className="text-gray-500 mt-1">單號：{order.poNumber}</p>