sessions: add chevrons to new session pills - #333608

PR classified as team-member.

✅ Head commit ae55ad7 is signed by meganrogge with trusted key SHA256:sTk/MTtZax7u8fNcBa9j0VIvNI5icLy4ClObz63IioI — approval requirement reduced from 2 to 1.

✅ Collaborator approvals: 1/1 (hediet).

✅ No newly added runnable binary files.

✅ No protected engineering system files changed.