add polling hook used for upcoming meetings notifications

src/redux/hooks.tsx

@@ -1,6 +1,30 @@
+import { useLayoutEffect, useEffect, useRef } from "react";
 import { TypedUseSelectorHook, useDispatch, useSelector } from "react-redux";
 import type { RootState, AppDispatch } from "./store";
 
 // Use throughout your app instead of plain `useDispatch` and `useSelector`
 export const useAppDispatch = () => useDispatch<AppDispatch>();
 export const useAppSelector: TypedUseSelectorHook<RootState> = useSelector;
+
+const useIsomorphicLayoutEffect = typeof window !== "undefined" ? useLayoutEffect : useEffect;
+export function useInterval(callback: () => void, delay: number | null) {
+  const savedCallback = useRef(callback);
+  
+  // Remember the latest callback if it changes.
+  useIsomorphicLayoutEffect(() => {
+    savedCallback.current = callback;
+  }, [callback]);
+  
+  // Set up the interval.
+  useEffect(() => {
+    // Don't schedule if no delay is specified.
+    // Note: 0 is a valid value for delay.
+    if (!delay && delay !== 0) {
+      return;
+    }
+  
+    const id = setInterval(() => savedCallback.current(), delay);
+  
+    return () => clearInterval(id);
+  }, [delay]);
+}