Backport commerce-sdk-isomorphic to v4.0.1

Author: shethj

packages/commerce-sdk-react/CHANGELOG.md

@@ -1,6 +1,6 @@
 ## v4.2.0-preview.1 (Nov 04, 2025)
 
-- Upgrade to commerce-sdk-isomorphic v4.1.0 [#2879](https://github.com/SalesforceCommerceCloud/pwa-kit/pull/2879)
+- Upgrade to commerce-sdk-isomorphic v4.0.1 [#3449](https://github.com/SalesforceCommerceCloud/pwa-kit/pull/3449)
 - Prevent headers from being overriden in `generateCustomEndpointOptions` [#3405](https://github.com/SalesforceCommerceCloud/pwa-kit/pull/3405/)
 
 ## v4.1.0 (Sep 25, 2025)

packages/commerce-sdk-react/package-lock.json

@@ -40,7 +40,7 @@
     "version": "node ./scripts/version.js"
   },
   "dependencies": {
-    "commerce-sdk-isomorphic": "^4.1.0",
+    "commerce-sdk-isomorphic": "^4.0.1",
     "js-cookie": "^3.0.1",
     "jwt-decode": "^4.0.0"
   },