test(collapse): 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 collapse component. Pure test additions, no behavior changes.

Issues

N/A

Related Links

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commit: 2315dac

[Copilot]

Pull request overview

This PR improves unit test coverage for the Collapse / CollapseItem components, focusing on edge cases around accordion mode behavior and how unnamed items are matched by index. It is a test-only change intended to validate existing runtime behavior without altering component logic.

Changes:

• Added assertions that accordion mode can collapse an expanded item back to undefined.
• Added coverage for null accordion model values (no items should expand).
• Added coverage for unnamed item behavior (index-based matching) in both normal mode and toggleAll, plus verifying toggleAll is a no-op in accordion mode.

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