fix(web): timeline divider pill shows a pointer, visible hover and focus ring (#15188)

Co-authored-by: Fionn Jones <264670603+jonesfionn101-dotcom@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
e08c31e1a1jonesfionn101-dotcom committed on 10/10/2026, 2:39:40 AM· committed by GitHubparentc1f21e5
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