fix(auth): unify imported sessions with account gating

tests/login-status.test.ts

@@ -27,6 +27,10 @@ function appWithBrowser(state: 'authenticated' | 'login-required' | 'unreachable
   app.use(
     createLoginRouter({
       services: {
+        accountAuth: {
+          ensureFullyAuthenticated: async () => state === 'authenticated',
+          getSnapshot: () => ({ redditUsername: state === 'authenticated' ? 'example-account' : null }),
+        },
         browser: {
           isSessionValid: async () => state === 'authenticated',
           getAuthenticatedUsername: async () => state === 'authenticated' ? 'example-account' : null,