Revert "MSAL browser migration changes"

This reverts commit b855094fb1.

src/redirectBridge.ts

@@ -1,16 +0,0 @@
-/**
- * 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);
-});