Add initial departure board table 'skeleton', very basic at present

src/lib/components/ui/TrainService.svelte

@@ -7,6 +7,7 @@
 	import TocStyle from '$lib/components/ui/TocStyle.svelte';
 	import TiplocConverter from '$lib/components/ui/TiplocConverter.svelte';
 	import { IconChevronDownFilled } from '@tabler/icons-svelte';
+	import { estClass } from '$lib/utils/time';
 	let { service }: { service: ApiTrainsTrainByHeadcode.TrainByHeadcodeResponse } = $props();
 	let isExpanded = $state(false);
 	let loadingDetails = $state(false);
@@ -45,8 +46,6 @@
 		loadingDetails = false;
 	}
 
-	const estClass = (act, est) => (!act && est ? 'est' : 'act');
-
 	const activityMap: Record<string, string> = {
 		'-D': 'Vehicles detatched',
 		'-T': 'Vehicles attached & detached',