fix(storybook): hide the SW Viewer Responsive 1920 row on narrow pages

src/sw/sw-stories.css

@@ -6,7 +6,9 @@
 .sw-story-responsive { container-type: inline-size; }
 .sb-page:has(.sw-story-responsive) { container: sw-story-page / inline-size; }
 .sw-story-responsive-wide { width: 1920px; max-width: none; margin-inline: calc((100% - 1920px) / 2); }
-@container sw-story-page (max-width: 1999.98px) { .sw-story-responsive-wide { display: none; } }
+/* sw-story-responsive-hidden (2026-10-23, SW Viewer Responsive): the same hiding for a 1920 row that stays inside the
+   Story column (no reach-out). */
+@container sw-story-page (max-width: 1999.98px) { :is(.sw-story-responsive-wide, .sw-story-responsive-hidden) { display: none; } }
 .sw-story-frame { background: #060606; }
 /* Shared drawing-area canvas of the SW Stories (2026-10-19): the SW/Viewer black grid — 40px cells, 1px lines of
    HM green #266651 at 18%, on #0A0A0B. Used behind the SW Header work area and dropdown room and the viewer frames. */

src/sw/sw-viewer.stories.tsx

@@ -331,8 +331,9 @@ export const Responsive: Story = {
         <div className="sw-story-stack sw-story-responsive">
           {[1920, 1440, 1280, 950, 860, 760, 520].map(width => (
             // 2026-10-22 (user request): the 1920 row no longer reaches out of the content area (no sw-story-responsive-wide);
-            // like the other rows it is a maximum inside the Story column.
-            <div key={width}><StorySection title={`${width}px`}>
+            // like the other rows it is a maximum inside the Story column. 2026-10-23: it is hidden on the same narrow pages
+            // as the SW Header / Footer 1920 rows (sw-story-responsive-hidden, sw-stories.css), e.g. a 1920px screen.
+            <div key={width} className={width === 1920 ? "sw-story-responsive-hidden" : undefined}><StorySection title={`${width}px`}>
               {/* The row width is a maximum (2026-10-22): on a narrower screen the header shrinks with it instead of scrolling. */}
               <div className="sw-story-scroller sw-viewer-story-menu-row"><div style={{ width: "100%", maxWidth: width }} data-width={width}><SWViewerHeader {...VIEWER_STORY_LOGO} documentTitle={demo.documentName} {...demo.fileProps} groups={demo.groups} trailing={demo.trailing} onCommand={demo.onCommand} /></div></div>
             </StorySection></div>