fix: route Account Pending sign out through backend signout flow (#25681)

The Sign Out button on the Account Pending overlay only cleared the
local token and redirected to /auth, skipping the backend signout. This
left the OAuth/OIDC session alive at the IdP, so re-login bounced the
user straight back into pending and never re-fetched updated role/group
claims. Call userSignOut() and honor the returned redirect_url, matching
the sidebar logout flow.


Fixes #25644

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/lib/components/layout/Overlay/AccountPending.svelte

@@ -2,7 +2,7 @@
 	import DOMPurify from 'dompurify';
 	import { marked } from 'marked';
 
-	import { getAdminDetails } from '$lib/apis/auths';
+	import { getAdminDetails, userSignOut } from '$lib/apis/auths';
 	import { onMount, tick, getContext } from 'svelte';
 	import { config } from '$lib/stores';
 
@@ -70,8 +70,12 @@
 					<button
 						class="text-xs text-center w-full mt-2 text-gray-400 underline"
 						on:click={async () => {
+							const res = await userSignOut().catch((err) => {
+								console.error(err);
+								return null;
+							});
 							localStorage.removeItem('token');
-							location.href = '/auth';
+							location.href = res?.redirect_url ?? '/auth';
 						}}>{$i18n.t('Sign Out')}</button
 					>
 				</div>