파일 페이지와 카테고리 페이지에서 파일 목록을 표시할 때도 가상 리스트를 사용하여 효율적으로 랜더링하도록 개선

src/lib/components/atoms/RowVirtualizer.svelte

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+<script lang="ts">
+  import { createWindowVirtualizer } from "@tanstack/svelte-virtual";
+  import { untrack, type Snippet } from "svelte";
+  import type { ClassValue } from "svelte/elements";
+
+  interface Props {
+    class?: ClassValue;
+    count: number;
+    item: Snippet<[index: number]>;
+    itemHeight: (index: number) => number;
+    placeholder?: Snippet;
+  }
+
+  let { class: className, count, item, itemHeight, placeholder }: Props = $props();
+
+  const virtualizer = $derived(
+    createWindowVirtualizer({
+      count: untrack(() => count),
+      estimateSize: itemHeight,
+    }),
+  );
+
+  const measureItem = (node: HTMLElement) => {
+    $effect(() => $virtualizer.measureElement(node));
+  };
+
+  $effect(() => $virtualizer.setOptions({ count }));
+</script>
+
+<div class={["relative", className]}>
+  <div style:height="{$virtualizer.getTotalSize()}px">
+    {#each $virtualizer.getVirtualItems() as virtualItem (virtualItem.key)}
+      <div
+        class="absolute left-0 top-0 w-full"
+        style:transform="translateY({virtualItem.start}px)"
+        data-index={virtualItem.index}
+        use:measureItem
+      >
+        {@render item(virtualItem.index)}
+      </div>
+    {/each}
+  </div>
+  {#if placeholder && $virtualizer.getVirtualItems().length === 0}
+    {@render placeholder()}
+  {/if}
+</div>