Two root causes for the remaining 6 E2E failures after PR #50:
1. AppBarScoreBadge: Router.createRouteURL('polaris') was called without
the cluster parameter, producing '/polaris' instead of '/c/main/polaris'.
Now uses K8s.useCluster() to pass the active cluster. (appbar.spec.ts:18)
2. Plugin settings: registerPluginSettings was called with 'polaris' but
the package.json name is 'headlamp-polaris'. Headlamp matches settings
registrations to the package name, so the component never rendered.
(settings.spec.ts — all 5 tests)
Co-Authored-By: Paperclip <noreply@paperclip.ing>