Add class prop

Author: terrakuh

src/lib/components/SortableList.svelte

@@ -596,7 +596,7 @@
 <!-- svelte-ignore a11y-role-supports-aria-props -->
 <ul
 	bind:this={rootRef}
-	class="ssl-list"
+	class="ssl-list {$$props.class ?? ''}"
 	style:--ssl-gap="{gap}px"
 	style:--ssl-wrap={hasWrapping ? 'wrap' : 'nowrap'}
 	style:--ssl-transition-duration="{transitionDuration}ms"

src/lib/components/SortableListItem.svelte

@@ -245,7 +245,7 @@ Serves as an individual item within `<SortableList.Root>`. Holds the data and co
 <li
 	bind:this={itemRef}
 	{id}
-	class="ssl-item"
+	class="ssl-item {$$props.class ?? ''}"
 	style:cursor={styleCursor}
 	style:width={styleWidth}
 	style:height={styleHeight}