refactor(views): consistent loading and empty states

apps/client/src/common/components/state/EmptyFill.tsx

@@ -0,0 +1,19 @@
+import { cx } from '../../utils/styleUtils';
+import Empty from './Empty';
+
+import style from './EmptyFill.module.scss';
+
+interface EmptyFillProps {
+  text?: string;
+  /** placed on the fill wrapper — e.g. to assign a grid-area in a grid parent */
+  className?: string;
+}
+
+/** Container-filling empty/loading state for panels and grid/flex cells. */
+export default function EmptyFill({ text, className }: EmptyFillProps) {
+  return (
+    <div className={cx([style.fill, className])}>
+      <Empty text={text} />
+    </div>
+  );
+}