style(ui): center content vertically in popup tab buttons (#373)

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
Co-authored-by: Lucenx9 <185146821+Lucenx9@users.noreply.github.com>
0d13448069Simone committed on 9/25/2026, 2:27:47 PM· committed by GitHubparent96cb5d5
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