fix: wrap scrollToIndex in requestAnimationFrame

[mxschll]

Description

Fixes incorrect scroll positioning in virtual lists by deferring scrollToIndex calls with requestAnimationFrame. This ensures virtual items are measured before scrolling occurs.

Related links, issue #, if available: n/a

How has this been tested?

Verified changes manually and in pipeline. Visual changes in scroll positions are expected.

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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