Extract shared data grid, selection bar, file dropzone and genre picker components

Track lists and the upload queue now render through a declarative DataGrid, the album editor reuses AlbumForm with a split layout and a track picker, and genre labels and types are shared helpers.

web-player/src/lib/components/music/TrackStatusBadge.svelte

@@ -0,0 +1,16 @@
+<script lang="ts">
+	import type { TrackStatus } from '$lib/types';
+	import { TRACK_STATUS } from '$lib/data/libraryTracks';
+	import StatusBadge from '$lib/components/ui/media/StatusBadge.svelte';
+
+	interface Props {
+		status: TrackStatus;
+		class?: string;
+	}
+
+	let { status, class: klass = '' }: Props = $props();
+
+	const info = $derived(TRACK_STATUS[status]);
+</script>
+
+<StatusBadge label={info.label} tone={info.tone} class={klass} />