fix: clear session storage before login

sib-auth-provider.js

@@ -33,6 +33,9 @@ class SIBAuthProvider extends HTMLElement {
     if ('localStorage' in window) {
       window.localStorage.clear();
     }
+    if ('sessionStorage' in window) {
+      window.sessionStorage.clear();
+    }
     auth.login(this.dataset.authority, { clientName: this.dataset.clientName });
   }