UI/LoadingBar: allow injecting props

pkgs/clan-app/ui/src/components/LoadingBar/LoadingBar.tsx

@@ -1,3 +1,8 @@
+import { JSX } from "solid-js";
 import styles from "./LoadingBar.module.css";
+import cx from "classnames";
 
-export const LoadingBar = () => <div class={styles.loading_bar} />;
+export type LoadingBarProps = JSX.HTMLAttributes<HTMLDivElement> & {};
+export const LoadingBar = (props: LoadingBarProps) => (
+  <div {...props} class={cx(styles.loading_bar, props.class)} />
+);