Static assets did not load. The page HTML arrived but /static/styles.css?v=e1e6a812dc44 and /static/app.js?v=e1e6a812dc44 did not, so there is no styling and navigation will not work. Usual causes: the page was opened from a file:// path instead of http://127.0.0.1:8080, a stale cache (hard-reload with Ctrl+Shift+R), or a proxy/extension blocking them. Check by opening /static/app.js?v=e1e6a812dc44 directly — it should show JavaScript.