/** * Returns true when keyboard focus belongs to the tabbed right-panel chrome * or its active surface. This deliberately excludes other preview-panel * shells so right-panel shortcuts do not affect standalone preview layouts. */export function isRightPanelFocused({  rightPanelOpen,  activePreviewTabId,}: {  readonly rightPanelOpen: boolean;  readonly activePreviewTabId: string | null;}): boolean {  if (!rightPanelOpen) return false;  const activeElement = document.activeElement;  if (!(activeElement instanceof HTMLElement)) return false;  if (!activeElement.isConnected) return false;  const previewViewport = activeElement.closest<HTMLElement>("[data-preview-viewport]");  const focusedPreviewTabId =    activeElement.tagName.toLowerCase() === "webview"      ? activeElement.getAttribute("data-preview-tab")      : (previewViewport?.getAttribute("data-preview-viewport") ?? null);  if (focusedPreviewTabId !== null) {    return focusedPreviewTabId === activePreviewTabId;  }  return (    activeElement.closest(      "[data-right-panel-tabbar], [data-right-panel-content], [data-right-panel-control]",    ) !== null  );}