test: unit tests for LocalLoginComponent

[Ma77Ball]

What changes were proposed in this PR?

• Add local-login.component.spec.ts to cover form construction, validators, default-user prefill, and the login/register flows that were previously untested.
• Tests assert that allForms exposes the five expected controls with required, minLength(6), and the custom confirmationValidator, that confirmationValidator returns { confirm: true } on mismatch and {} on match, and that updateConfirmValidator schedules updateValueAndValidity on the confirmation control via setTimeout.
• Tests assert that ngOnInit patches loginUsername/loginPassword only when GuiConfigService.env.defaultLocalUser is populated, that login short-circuits via loginErrorMessage on validation failure and otherwise calls UserService.login with the trimmed username and navigates to queryParams.returnUrl or DASHBOARD_USER_WORKFLOW, and that error paths surface the error's message (or the fallback "Incorrect username or password") through NotificationService.error.
• Tests assert that register enforces password length, password match, and UserService.validateUsername, calls UserService.register with the trimmed username on success and surfaces the account-created notification, and on error notifies with the error's message (or the fallback "Registration failed").

Any related issues, documentation, or discussions?

Closes: #5226

How was this PR tested?

• yarn test --include="src/app/hub/component/about/local-login/local-login.component.spec.ts", 22 tests passing.
• 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

[Ma77Ball]

/request-review @Yicong-Huang

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 45.95%. Comparing base (d8c254c) to head (3617679).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5235      +/-   ##
============================================
- Coverage     48.93%   45.95%   -2.99%     
+ Complexity     2373     2214     -159     
============================================
  Files          1048     1049       +1     
  Lines         40270    40655     +385     
  Branches       4272     4332      +60     
============================================
- Hits          19708    18684    -1024     
- Misses        19405    20841    +1436     
+ Partials       1157     1130      -27     

Flag	Coverage Δ		*Carryforward flag
access-control-service	39.53% <ø> (ø)		Carriedforward from 0bce181
agent-service	33.74% <ø> (-0.03%)	⬇️	Carriedforward from 0bce181
amber	44.07% <ø> (-7.46%)	⬇️	Carriedforward from 0bce181
computing-unit-managing-service	0.00% <ø> (ø)		Carriedforward from 0bce181
config-service	0.00% <ø> (ø)		Carriedforward from 0bce181
file-service	32.09% <ø> (-5.90%)	⬇️	Carriedforward from 0bce181
frontend	40.85% <ø> (+0.20%)	⬆️
python	90.45% <ø> (-0.35%)	⬇️	Carriedforward from 0bce181
workflow-compiling-service	56.81% <ø> (ø)		Carriedforward from 0bce181

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[chenlica]

@Xiao-zhen-Liu Please review this PR.