Refactor: eliminate code duplication and extract shared utilities

src/app/[country]/[locale]/(checkout)/checkout/[id]/page.tsx

@@ -28,15 +28,7 @@
 } from "@/lib/data/checkout";
 import { isAuthenticated as checkAuth } from "@/lib/data/cookies";
 import { getCountries, getCountry } from "@/lib/data/countries";
-
-// Extract base path from pathname (e.g., /us/en from /us/en/checkout/123)
-function extractBasePath(pathname: string): string {
-  const match = pathname.match(/^\/([a-z]{2})\/([a-z]{2})(\/|$)/i);
-  if (match) {
-    return `/${match[1]}/${match[2]}`;
-  }
-  return "";
-}
+import { extractBasePath } from "@/lib/utils/path";
 
 // Checkout steps
 type CheckoutStep = "address" | "delivery" | "payment";
@@ -384,7 +376,7 @@
       );
       return result.address;
     }
     throw new Error(result.error || "Failed to update address");
   };
 
   // Navigate back to a previous step

src/app/[country]/[locale]/(checkout)/layout.tsx

@@ -5,14 +5,7 @@ import { usePathname } from "next/navigation";
 import { useState } from "react";
 import { CheckoutProvider, CheckoutSummary } from "@/contexts/CheckoutContext";
 import { useStore } from "@/contexts/StoreContext";
-
-function extractBasePath(pathname: string): string {
-  const match = pathname.match(/^\/([a-z]{2})\/([a-z]{2})(\/|$)/i);
-  if (match) {
-    return `/${match[1]}/${match[2]}`;
-  }
-  return "";
-}
+import { extractBasePath } from "@/lib/utils/path";
 
 function CheckoutHeader() {
   const pathname = usePathname();