fix(tree-view): nested folder children not stretching to full width (#360)

Author: braden-w

src/lib/components/ui/tree-view/tree-view-folder.svelte

@@ -28,7 +28,7 @@
 	<Collapsible.Content class="mx-2 border-l">
 		<div class="relative flex place-items-start">
 			<div class="bg-border mx-2 h-full w-px"></div>
-			<div class="flex flex-col">
+			<div class="flex flex-1 flex-col">
 				{@render children?.()}
 			</div>
 		</div>