test(sw): approve the f26ec7c SW viewer header merge baseline

Test-only approval commit after the f26ec7c main merge (sw-test-regression-
baseline section 9); no protected path changes, no Story change.
- approvedMainCommit 21fe7a2 -> f26ec7c.
- public-api.approved.json kept: the public .d.ts files are byte-identical.
- docs/sw/sw-viewer-header-strip-2026-10-21.md: changes and verification.

packages/sw/tests/storybook-inventory.mjs

@@ -64,7 +64,10 @@ export const integratedChangedFiles = [
 // SWRecentFiles / home-menu types / viewer types for the preview and collapseBelow / iconOnlyBelow JSDoc).
 // -> 21fe7a2 (2026-10-21, Merge fix/sw-property-counts-hover: user-approved property popup count Hover only on the
 // object list, 17170d2; no Story change, public .d.ts unchanged so public-api.approved.json is kept).
-export const approvedMainCommit = '21fe7a29c7c3350e0981ebf594ad6001c4f2bfd2'
+// -> f26ec7c (2026-10-21, Merge docs/sw-viewer-layer-eye: user-approved viewer layer eye-icon rule, header hover,
+// trailing strip, file-name width and open icon outline, caf4c32; no Story change, public .d.ts unchanged so
+// public-api.approved.json is kept).
+export const approvedMainCommit = 'f26ec7c696c596ad01dfa01f47fa8c6e207797bd'
 // 170a5c2: the SW/Header sidebar page of the home menu (the moved verification Stories are movedHomeMenuIds).
 export const homeMenuSidebarIds = ['sw-header--home-menu']
 // 6cf8854 SW Footer (current IDs after retiredFooterIds), 7f42923 viewer mode, 41e963a theme inheritance.