test(breadcrumb): improve test coverage

[aioya]

Checklist

List of tasks you have already done and plan to do.

• Fix linting errors
• Tests have been added / updated (or snapshots)

Change information

Improve unit test coverage for the breadcrumb component. Pure test additions, no behavior changes.

Issues

N/A

Related Links

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commit: 00affbd

[Copilot]

Pull request overview

This PR improves unit test coverage for the breadcrumb component by adding a minimal sanity test that verifies the component’s plugin installation registers the component with a Vue app.

Changes:

• Add breadcrumb plugin unit test to ensure app.use(Breadcrumb) registers Breadcrumb.name via Vue’s component registry.

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