Improve SSO auth flow

Use replaceState instead of a redirect to strip the loginToken
Put user into the same post-auth flows of E2ESetup
Skip UIA prompt in this post-auth flow, happy path is a server grace period

src/Lifecycle.ts

@@ -366,7 +366,7 @@ async function abortLogin() {
 //      The plan is to gradually move the localStorage access done here into
 //      SessionStore to avoid bugs where the view becomes out-of-sync with
 //      localStorage (e.g. isGuest etc.)
-async function restoreFromLocalStorage(opts?: { ignoreGuest?: boolean }): Promise<boolean> {
+export async function restoreFromLocalStorage(opts?: { ignoreGuest?: boolean }): Promise<boolean> {
     const ignoreGuest = opts?.ignoreGuest;
 
     if (!localStorage) {