test: cover hub.component sidebar gating and routerLinks

[Ma77Ball]

What changes were proposed in this PR?

• Replace the hub.component.spec.ts smoke test with nine tests covering default-input render, GuiConfigService injection, per-flag sidebarTabs.*_enabled gating, all-enabled rendering, exclusion of disabled tabs, routerLink bindings to the three routing constants, and isLogin input passthrough.
• Wrap HubComponent in a test host <ul nz-menu> so nz-menu-item directives resolve their DI tokens the same way they do under the dashboard at runtime.
• Read routerLink via the directive's routerLinkInput signal since the routerLink input is a write-only setter and ng-reflect-router-link is not populated in the Vitest environment.

Any related issues, documentation, or discussions?

Closes: #5224

How was this PR tested?

• yarn test --include='src/app/hub/component/hub.component.spec.ts': 9 passed, 0 failed.
• yarn format:fix: 506 files unchanged.

Was this PR authored or co-authored using generative AI tooling?

Co-authored with Claude Opus 4.7 in compliance with ASF

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.55%. Comparing base (24f7702) to head (c43afaf).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5231      +/-   ##
============================================
- Coverage     48.55%   48.55%   -0.01%     
  Complexity     2372     2372              
============================================
  Files          1042     1042              
  Lines         39971    39971              
  Branches       4252     4252              
============================================
- Hits          19408    19407       -1     
- Misses        19414    19416       +2     
+ Partials       1149     1148       -1     

Flag	Coverage Δ		*Carryforward flag
access-control-service	39.53% <ø> (ø)
agent-service	33.76% <ø> (ø)		Carriedforward from 9079dbe
amber	51.51% <100.00%> (-0.01%)	⬇️
computing-unit-managing-service	0.00% <ø> (ø)
config-service	0.00% <ø> (ø)
file-service	37.99% <ø> (ø)
frontend	40.02% <ø> (ø)		Carriedforward from 9079dbe
python	90.51% <ø> (ø)		Carriedforward from 9079dbe
workflow-compiling-service	56.81% <ø> (ø)

*This pull request uses carry forward flags. Click here to find out more.

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