fix(azure-ad): use PKCE instead of state cookie to fix proxy issues

src/lib/auth.ts

@@ -39,6 +39,7 @@ export const authOptions: NextAuthOptions = {
           scope: "openid profile email offline_access user.read Calendars.ReadWrite Tasks.ReadWrite"
         }
       },
+      checks: ["pkce"],
     }),
     CredentialsProvider({
       name: "credentials",