refactor: backstage design review

refactor: improve empty state

refactor: review schedule design

- fit as many elements as possible
- expose cycle interval as an option
- stabilise rundown reference
- style tweaks

apps/client/src/common/hooks/useInterval.js

@@ -1,27 +0,0 @@
-import { useEffect, useRef } from 'react';
-
-/**
- * @description utility hook to around setInterval
- * @param callback
- * @param delay
- */
-export const useInterval = (callback, delay) => {
-  const savedCallback = useRef();
-
-  useEffect(() => {
-    savedCallback.current = callback;
-  }, [callback]);
-
-  useEffect(() => {
-    /**
-     * @description function to be called
-     */
-    function tick() {
-      savedCallback.current();
-    }
-    if (delay !== null) {
-      const id = setInterval(tick, delay);
-      return () => clearInterval(id);
-    }
-  }, [delay]);
-};