feat(queue): add scroll to currently playing button

Adds a scrollToIndex method to VirtualList and a locate button in the
Queue header that scrolls to center the currently playing track.

src/lib/components/player/Queue.svelte

@@ -1,5 +1,5 @@
 <script lang="ts">
-	import { GripVertical, Play, X } from "@lucide/svelte";
+	import { GripVertical, LocateFixed, Play, X } from "@lucide/svelte";
 	import * as AlertDialog from "$lib/components/ui/alert-dialog";
 	import { Button } from "$lib/components/ui/button";
 	import VirtualList from "$lib/components/ui/VirtualList.svelte";
@@ -7,6 +7,16 @@
 	import type { Track } from "$lib/player/types";
 	import { songTypeNumberLabel } from "$lib/utils/amq";
 
+	let virtualList: ReturnType<typeof VirtualList>;
+
+	function scrollToCurrentlyPlaying() {
+		if (player.currentId == null) return;
+		const index = player.displayQueue.findIndex(
+			(t) => t.id === player.currentId,
+		);
+		if (index !== -1) virtualList?.scrollToIndex(index);
+	}
+
 	const ITEM_HEIGHT = 64;
 
 	function onRemove(id: number) {
@@ -45,21 +55,31 @@
 <div
 	class="flex flex-col h-full w-full bg-background/50 backdrop-blur rounded-lg border overflow-hidden"
 >
-	<div class="px-4 py-3 border-b flex justify-between items-center bg-muted/20">
-		<h3 class="font-semibold text-sm">
-			Up Next
+	<div
+		class="px-4 py-3 border-b flex text-sm items-center justify-between bg-muted/20"
+	>
+		<div class="flex items-center gap-1">
+			<h3 class="font-semibold">Up Next</h3>
 			{#if player.displayQueue.length > 0}
 				<span class="text-muted-foreground font-normal ml-1"
 					>({player.displayQueue.length})</span
 				>
+				<Button
+					variant="ghost"
+					size="sm"
+					class="h-6 w-6 p-0"
+					aria-label="Scroll to currently playing"
+					onclick={scrollToCurrentlyPlaying}
+				>
+					<LocateFixed class="h-3 w-3" />
+				</Button>
 			{/if}
-		</h3>
+		</div>
 		<AlertDialog.Root>
 			<AlertDialog.Trigger>
 				{#snippet child({ props })}
 					<Button variant="ghost" size="sm" class="h-6 w-6 p-0" {...props}>
-						<span class="sr-only">Clear</span>
-						<X class="h-3 w-3" />
+						<X class="h-3 w-3" aria-label="Clear" />
 					</Button>
 				{/snippet}
 			</AlertDialog.Trigger>
@@ -81,6 +101,7 @@
 	</div>
 
 	<VirtualList
+		bind:this={virtualList}
 		items={player.displayQueue}
 		itemHeight={ITEM_HEIGHT}
 		overscan={5}