Categorize components/ui into primitives, overlay, media, forms and layout

Splits the flat 38-component ui/ folder into primitives/ (generic
controls), overlay/ (menus/modals), media/ (music-domain display
components), forms/ (composite entity forms) and layout/ (page
scaffolding), and updates every import path accordingly.

web-player/src/lib/components/ui/media/ArtistLink.svelte

@@ -0,0 +1,23 @@
+<script lang="ts">
+	interface Props {
+		name?: string | null;
+		ownerUserId?: string | number | null;
+		class?: string;
+	}
+
+	let { name, ownerUserId, class: klass = '' }: Props = $props();
+</script>
+
+{#if name}
+	{#if ownerUserId}
+		<a
+			href="/u/{ownerUserId}"
+			onclick={(e) => e.stopPropagation()}
+			class="block max-w-full truncate hover:text-fg-2 hover:underline {klass}"
+		>
+			{name}
+		</a>
+	{:else}
+		<span class="block truncate {klass}">{name}</span>
+	{/if}
+{/if}