update cart discount for prod build, add loading toast

app/home/(user)/_components/cart/discount-code-actions.ts

@@ -0,0 +1,24 @@
+"use server"
+
+import { applyPromotions } from "@lib/data/cart"
+
+export async function addPromotionCodeAction(code: string) {
+  try {
+    await applyPromotions([code]);
+    return { success: true, message: 'Discount code applied successfully' };
+  } catch (error) {
+    console.error('Error applying promotion code:', error);
+    return { success: false, message: 'Failed to apply discount code' };
+  }
+}
+
+export async function removePromotionCodeAction(codeToRemove: string, appliedCodes: string[]) {
+  try {
+    const updatedCodes = appliedCodes.filter((appliedCode) => appliedCode !== codeToRemove);
+    await applyPromotions(updatedCodes);
+    return { success: true, message: 'Discount code removed successfully' };
+  } catch (error) {
+    console.error('Error removing promotion code:', error);
+    return { success: false, message: 'Failed to remove discount code' };
+  }
+}