fix(apollo): logout on stale Auth0 token errors

When getAccessTokenSilently fails with login_required, invalid_grant,
missing_refresh_token, consent_required or interaction_required, log
the user out (without redirect) so the UI reflects reality instead of
appearing logged in while every authenticated query silently fails.

app/plugins/apollo.ts

@@ -18,10 +18,22 @@ const cache = new InMemoryCache({
   },
 })
 
+const STALE_AUTH_ERRORS = new Set([
+  'login_required',
+  'consent_required',
+  'interaction_required',
+  'invalid_grant',
+  'missing_refresh_token',
+])
+
 const getToken = async (options: GetTokenSilentlyOptions) => {
   const nuxtApp = useNuxtApp()
   const auth0: Auth0VueClient = nuxtApp.$auth0 as Auth0VueClient
-  return await auth0.getAccessTokenSilently(options).catch(() => {
+  return await auth0.getAccessTokenSilently(options).catch((err) => {
+    const code = err && typeof err === 'object' && 'error' in err ? (err as { error?: string }).error : undefined
+    if (code && STALE_AUTH_ERRORS.has(code)) {
+      auth0.logout({ openUrl: false }).catch(() => {})
+    }
     return undefined
   })
 }