fix(tests): use secure token generation for access token in navigation client

tests/routes/test_navigation_routes.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import secrets
 from datetime import datetime
 from typing import Tuple, cast
 
@@ -70,7 +71,7 @@ def navigation_client() -> Tuple[TestClient, StubNavigationService, AuthSession]
 
     user = cast(User, object())
     session = AuthSession(
-        tokens=SessionTokens(access_token="token", refresh_token=None),
+        tokens=SessionTokens(access_token=secrets.token_urlsafe(16), refresh_token=None),
         user=user,
         role_slugs=("viewer",),
     )