Add spec coverage for hub.component.ts

[Ma77Ball]

Task Summary

Create hub.component.spec.ts for frontend/src/app/hub/component/hub.component.ts.

The component is a thin sidebar/menu shell — it exposes @input() isLogin, @input() sidebarTabs: SidebarTabs, and the routing constants DASHBOARD_HOME, DASHBOARD_HUB_WORKFLOW_RESULT, DASHBOARD_HUB_DATASET_RESULT. It injects GuiConfigService as config.

Behavior to cover:

• Component created with default isLogin = false and empty sidebarTabs.
• RouterLink directives bind to the correct constants for each menu item.
• Menu items render conditionally based on isLogin and sidebarTabs flags (verify NgIf branches for each tab the template gates on).
• config (GuiConfigService) is exposed as protected, and the template uses it for gating — verify gated items render/hide correctly per config.

Task Type

• Refactor / Cleanup
• DevOps / Deployment / CI
• Testing / QA
• Documentation
• Performance
• Other

[Ma77Ball]

/take