fix some bugs from ghatreh

src/utils/productPrice.ts

@@ -234,6 +234,11 @@ export function getProductSellPrice(product?: Product | null): number {
   return base - resolveProductCashFeeSellRial(product, base)
 }
 
+/** کارت فروشگاه: قیمت نمایشی صفر → «بدون قیمت» */
+export function isProductWithoutDisplayPrice(product?: Product | null): boolean {
+  return getProductBuyPrice(product) <= 0
+}
+
 export function isProductPriceInactive(product?: Product | null): boolean {
   if (!product) {
     return true

src/utils/productTradeOpen.ts

@@ -9,12 +9,14 @@ function asBool(value: boolean | number | null | undefined) {
 
 export function isProductBuyOpen(product: TradeOpenProduct) {
   if (!product) return true
-  return asBool(product?.open_buy)
+  if (product.open_buy === undefined || product.open_buy === null) return true
+  return asBool(product.open_buy)
 }
 
 export function isProductSellOpen(product: TradeOpenProduct) {
   if (!product) return true
-  return asBool(product?.open_sell)
+  if (product.open_sell === undefined || product.open_sell === null) return true
+  return asBool(product.open_sell)
 }
 
 export function isAnyProductTradeOpen(product: TradeOpenProduct) {