MSAL browser migration changes

src/redirectBridge.ts

@@ -0,0 +1,16 @@
+/**
+ * MSAL COOP Redirect Bridge
+ *
+ * This page handles the authentication response from the Identity Provider (IdP)
+ * and broadcasts it to the main application frame. Required for msal-browser v5+
+ * to securely handle auth responses when the IdP sets Cross-Origin-Opener-Policy headers.
+ *
+ * Security Note: This file must be bundled with your application, NOT loaded from a CDN.
+ *
+ * CG Alert: MVS-2026-vmmw-f85q
+ */
+import { broadcastResponseToMainFrame } from "@azure/msal-browser/redirect-bridge";
+
+broadcastResponseToMainFrame().catch((error: unknown) => {
+  console.error("MSAL redirect bridge error:", error);
+});