Test-only approval commit after the f340a26 main merge (sw-test-regression-
baseline section 9); no protected path changes, no Story change.
- approvedMainCommit 6b6f17c -> f340a26.
- public-api.approved.json kept: the public .d.ts files are byte-identical.
- docs/sw/sw-viewer-open-icon-2026-10-21.md: changes and verification.
