💄 style(goods-detail): update flex spacing class

- replace space-x-2 with gap-2 for more consistent flex spacing

mini/src/pages/goods-detail/index.tsx

@@ -213,7 +213,7 @@ export default function GoodsDetailPage() {
             </View>
           </View>
           
-          <View className="flex space-x-2">
+          <View className="flex gap-2">
             <Button 
               variant="outline"
               onClick={handleAddToCart}