The TypeSelector on existing properties used a colored pill with no
border, while the add-property form used a bordered muted-bg control.
Align both to the add-property style: 26px height, visible border,
muted background, 4px radius.
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>