fix: unify free shipping threshold to 10000 RSD across all pages

- Create centralized shipping config file (src/lib/config/shipping.ts)
- Update CartDrawer.tsx: change hardcoded 5000 to FREE_SHIPPING_THRESHOLD_RSD constant
- Update TickerBar.tsx: change hardcoded 10000 to use centralized constant
- Ensure uniform free shipping messaging across all pages and localizations

src/components/cart/CartDrawer.tsx

@@ -9,6 +9,7 @@ import { useTranslations, useLocale } from "next-intl";
 import { useSaleorCheckoutStore } from "@/stores/saleorCheckoutStore";
 import { formatPrice } from "@/lib/saleor";
 import { useAnalytics } from "@/lib/analytics";
+import { FREE_SHIPPING_THRESHOLD_RSD } from "@/lib/config/shipping";
 
 export default function CartDrawer() {
   const t = useTranslations("Cart");
@@ -251,9 +252,9 @@ export default function CartDrawer() {
                     </span>
                   </div>
 
-                  {(checkout?.subtotalPrice?.gross?.amount || 0) < 5000 && (
+                  {(checkout?.subtotalPrice?.gross?.amount || 0) < FREE_SHIPPING_THRESHOLD_RSD && (
                     <p className="text-xs text-[#666666] text-center">
-                      {t("freeShippingOver", { amount: formatPrice(5000) })}
+                      {t("freeShippingOver", { amount: formatPrice(FREE_SHIPPING_THRESHOLD_RSD) })}
                     </p>
                   )}
                 </div>

src/components/home/TickerBar.tsx

@@ -1,10 +1,11 @@
 "use client";
 
 import { motion } from "framer-motion";
+import { FREE_SHIPPING_THRESHOLD_RSD } from "@/lib/config/shipping";
 
 export default function TickerBar() {
   const items = [
-    "Free shipping on orders over 10000 RSD",
+    `Free shipping on orders over ${FREE_SHIPPING_THRESHOLD_RSD} RSD`,
     "Natural ingredients",
     "Cruelty-free",
     "Handmade with love",