PR #16688 CI follow-up at c5ff6bc20d28b372ca36c93c086f62f95d417695

CI run 39214942350, initial attempt: 8046 passed / 2 failed.
Failures: WorkflowOpeningBlock highlighting; AttachmentFilePreview source view.
Failed-job retry: 8047 passed / 1 failed.
Remaining: src/components/chat/WorkflowOpeningBlock.browser.test.tsx:
shows a short script as highlighted code with nothing to open
Assertion: expected .chat-markdown-shiki query result not to be null (line 103).

Focused local browser run from apps/web:
../../node_modules/.bin/vp test run --project browser src/components/chat/WorkflowOpeningBlock.browser.test.tsx
PR head c5ff6bc20d: 3 passed.
Pinned main 1451e7cb23: 3 passed.

No web/client-runtime code differs between the PR and pinned main. The only
new shared export is used by the server scanner. This supports treating the
remaining CI result as outside the scanner change; it does not make CI green.
The CI failure remains a readiness blocker. No unrelated code or test changed.