add InputGroup component

src/lib/InputGroup.svelte

@@ -0,0 +1,12 @@
+<script lang="ts">
+	import type { ClassValue } from 'svelte/elements';
+
+	interface Props {
+		class?: ClassValue | undefined | null;
+		children?: import('svelte').Snippet;
+	}
+
+	let { class: classList, children }: Props = $props();
+</script>
+
+<div class={['mt-4 flex min-w-80 items-end gap-2', classList]}>{@render children?.()}</div>