ui: Use $lib in imports

ui/src/components/DateFormat.svelte

@@ -1,17 +0,0 @@
-<script>
- export let date;
- export let dateStyle = "long";
- export let timeStyle = "long";
-
- function formatDate(input, dateStyle, timeStyle) {
-     if (typeof input === 'string') {
-         input = new Date(input);
-     }
-     return new Intl.DateTimeFormat(undefined, {
-         dateStyle,
-         timeStyle,
-     }).format(input);
- }
-</script>
-
-{formatDate(date, dateStyle, timeStyle)}