BottomBar 구현

src/routes/(main)/+layout.svelte

@@ -0,0 +1,12 @@
+<script lang="ts">
+  import BottomBar from "./BottomBar.svelte";
+
+  let { children } = $props();
+</script>
+
+<div class="flex h-full w-full flex-col justify-between">
+  <div>
+    {@render children?.()}
+  </div>
+  <BottomBar />
+</div>