React 19: useRef<T>() -> useRef<T>(null) across 15 sites

React 19 dropped the no-arg useRef overload — the type-only useRef<T>()
form (no initial value) is gone, every call must pass an initial value.
The codebase had 15 occurrences of useRef<HTMLDivElement>() (DOM ref
pattern) all flagged by tsgo as 'Expected 1 arguments, but got 0'.

Mechanical sweep to useRef<HTMLDivElement>(null) — no behavior change,
React still hands out a ref object with .current set to null at mount.

Net tsgo error count: 57 -> 42.

src/components/catalog/views/page/widgets/CatalogBundleGridWidgetView.tsx

@@ -11,7 +11,7 @@ export const CatalogBundleGridWidgetView: FC<CatalogBundleGridWidgetViewProps> =
 {
     const { columnCount = 5, children = null, ...rest } = props;
     const { currentOffer = null } = useCatalog();
-    const elementRef = useRef<HTMLDivElement>();
+    const elementRef = useRef<HTMLDivElement>(null);
 
     useEffect(() =>
     {

src/components/catalog/views/page/widgets/CatalogItemGridWidgetView.tsx

@@ -16,7 +16,7 @@ export const CatalogItemGridWidgetView: FC<CatalogItemGridWidgetViewProps> = pro
     const { currentOffer = null, currentPage = null, selectCatalogOffer = null } = useCatalog();
     const catalogAdmin = useCatalogAdmin();
     const adminMode = catalogAdmin?.adminMode ?? false;
-    const elementRef = useRef<HTMLDivElement>();
+    const elementRef = useRef<HTMLDivElement>(null);
     const [ dragIndex, setDragIndex ] = useState<number | null>(null);
     const [ dropIndex, setDropIndex ] = useState<number | null>(null);
 

src/components/catalog/views/page/widgets/CatalogSpacesWidgetView.tsx

@@ -18,7 +18,7 @@ export const CatalogSpacesWidgetView: FC<CatalogSpacesWidgetViewProps> = props =
     const [ selectedGroupIndex, setSelectedGroupIndex ] = useState(-1);
     const [ selectedOfferForGroup, setSelectedOfferForGroup ] = useState<IPurchasableOffer[]>(null);
     const { currentPage = null, currentOffer = null, setCurrentOffer = null, setPurchaseOptions = null } = useCatalog();
-    const elementRef = useRef<HTMLDivElement>();
+    const elementRef = useRef<HTMLDivElement>(null);
 
     const setSelectedOffer = (offer: IPurchasableOffer) =>
     {