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 45.60%. Comparing base (d5bc8b7) to head (8e345fe).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5232      +/-   ##
============================================
- Coverage     48.72%   45.60%   -3.12%     
+ Complexity     2375     2216     -159     
============================================
  Files          1044     1045       +1     
  Lines         40096    40457     +361     
  Branches       4252     4311      +59     
============================================
- Hits          19538    18452    -1086     
- Misses        19411    20888    +1477     
+ Partials       1147     1117      -30     

Flag	Coverage Δ		*Carryforward flag
access-control-service	39.53% <ø> (ø)		Carriedforward from bf2f92c
agent-service	33.74% <ø> (-0.03%)	⬇️	Carriedforward from bf2f92c
amber	43.88% <ø> (-7.68%)	⬇️	Carriedforward from bf2f92c
computing-unit-managing-service	0.00% <ø> (ø)		Carriedforward from bf2f92c
config-service	0.00% <ø> (ø)		Carriedforward from bf2f92c
file-service	32.09% <ø> (-5.90%)	⬇️	Carriedforward from bf2f92c
frontend	40.10% <ø> (+0.07%)	⬆️
python	90.50% <ø> (-0.30%)	⬇️	Carriedforward from bf2f92c
workflow-compiling-service	56.81% <ø> (ø)		Carriedforward from bf2f92c

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

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[Ma77Ball]

/request-review @Yicong-Huang