fix(core/menu-category): Fix unit test race condition

[lzeiml]

Currently this unit test sometimes fails due to a race condition. categoryButton.focus() was called without ensuring tabindex initialization for the categoryButton was complete.
This change prevents this by waiting for aria-posinset to be intialized, signaling that roving-tabindex intialization is complete.

Summary by CodeRabbit

• Tests
  • Added a regression assertion verifying the category button’s accessible position before keyboard navigation checks.

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📥 Commits

Reviewing files that changed from the base of the PR and between ff4ef03 and 59c2169.

📒 Files selected for processing (1)

• packages/core/src/components/menu-category/test/menu-category.ct.ts

📝 Walkthrough

Walkthrough

The menu-category keyboard navigation regression test now asserts that the category button has aria-posinset="1" before continuing with focus and ArrowDown checks.

Changes

Menu category accessibility

Layer / File(s)	Summary
Validate category button position packages/core/src/components/menu-category/test/menu-category.ct.ts	The regression test verifies aria-posinset="1" on the category button before keyboard navigation assertions.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• siemens/ix#2573: Updates menubar ARIA position attributes during focus and keyboard navigation.

Suggested reviewers: benjgil

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main change: fixing a unit test race condition in core/menu-category.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/menu-category-unit-test-race-condition

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[lzeiml]

already addressed with #2666