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/components/state/Empty.tsx

@@ -1,18 +1,20 @@
 import { CSSProperties } from 'react';
 
 import EmptyImage from '../../../assets/images/empty.svg?react';
+import { cx } from '../../utils/styleUtils';
 
 import style from './Empty.module.scss';
 
 interface EmptyProps {
   text?: string;
   style?: CSSProperties;
+  className?: string;
 }
 
 export default function Empty(props: EmptyProps) {
-  const { text, ...rest } = props;
+  const { text, className, ...rest } = props;
   return (
-    <div className={style.emptyContainer} {...rest}>
+    <div className={cx([style.emptyContainer, className])} {...rest}>
       <EmptyImage className={style.empty} />
       {text && <span className={style.text}>{text}</span>}
     </div>