fix(sw): align header trailing border gradients

packages/sw/src/components/sw-viewer/SWViewerHeader.tsx

@@ -435,7 +435,9 @@ export const SWViewerHeader = forwardRef<HTMLElement, SWViewerHeaderProps>(funct
               if (owner) command({ id: entry.id, itemId: owner, value: entry.type === "checkbox" ? !entry.checked : undefined })
             }} />
         </>}
-        {(end.length > 0 || trailing) && <div className="hm-sw-viewer-header__actions">{end.map(renderGroup)}{trailing}</div>}
+        {/* The empty strip-start mark (2026-10-23) holds the rounded object end drawn before the trailing strip
+            (sw-viewer.css), so the strip cells keep their own pseudo-elements for the strip outline. */}
+        {(end.length > 0 || trailing) && <div className="hm-sw-viewer-header__actions">{end.map(renderGroup)}{trailing && <span className="hm-sw-viewer-header__strip-start" aria-hidden="true" />}{trailing}</div>}
       </div>
     </header>
   )