chore: upgrade to react@19 (#9182)

packages/excalidraw/hooks/useOutsideClick.ts

@@ -2,7 +2,7 @@ import { useEffect } from "react";
 import { EVENT } from "../constants";
 
 export function useOutsideClick<T extends HTMLElement>(
-  ref: React.RefObject<T>,
+  ref: React.RefObject<T | null>,
   /** if performance is of concern, memoize the callback */
   callback: (event: Event) => void,
   /**

packages/excalidraw/hooks/useScrollPosition.ts

@@ -5,7 +5,7 @@ import throttle from "lodash.throttle";
 const scrollPositionAtom = atom<number>(0);
 
 export const useScrollPosition = <T extends HTMLElement>(
-  elementRef: React.RefObject<T>,
+  elementRef: React.RefObject<T | null>,
 ) => {
   const [scrollPosition, setScrollPosition] = useAtom(scrollPositionAtom);