fix: show Preview as icon in turn changes summary - #328582

PR classified as community.

⚠️ Head commit is NOT signed by a trusted team member, so the full 3-approval requirement applies. (Clean GitHub merge b2e1af0 of base into PR branch, but PR-branch parent 15957d0 is not signed by a trusted team member: Head commit signature not verified (reason: unsigned).)

Tip: to earn the credit (−1 approval), the head commit must be signed by you with one of your own keys listed in security/trusted-signing-keys.csv. A "Verified" badge that GitHub adds to commits it creates on your behalf — web-editor edits, applied suggestions, Codespaces, API commits — does not count.

⚠️ Collaborator approvals: 0/3.

Needs 3 more collaborator approvals to merge.

✅ No newly added runnable binary files.

✅ No protected engineering system files changed.