feat: global error fallback and e2e (#91)

* fix(ui): add global route fallback with error toast and retry

* test(e2e): cover cloud accounts error fallback UI

package.json

@@ -139,6 +139,7 @@
     "lucide-react": "^0.553.0",
     "react": "^19.2.0",
     "react-dom": "^19.2.0",
+    "react-error-boundary": "^6.1.0",
     "react-i18next": "^16.2.4",
     "reflect-metadata": "^0.2.2",
     "rxjs": "^7.8.2",