Modal, AdaptiveDiv, BottomDiv 컴포넌트를 molecules 디렉터리로 이동 및 리팩토링

src/lib/components/atoms/divs/AdaptiveDiv.svelte

@@ -0,0 +1,15 @@
+<script lang="ts">
+  import type { Snippet } from "svelte";
+  import type { ClassValue } from "svelte/elements";
+
+  interface Props {
+    children?: Snippet;
+    class?: ClassValue;
+  }
+
+  let { children, ...props }: Props = $props();
+</script>
+
+<div class={["mx-auto w-full max-w-screen-md", props.class]}>
+  {@render children?.()}
+</div>