add shadcn-svelte, add custom titlebar

src/routes/+layout.svelte

@@ -0,0 +1,10 @@
+<script lang="ts">
+  import Titlebar from "@/components/ui/titlebar/titlebar.svelte";
+  import "../app.css";
+  let { children } = $props();
+</script>
+
+<Titlebar />
+<main class="pt-7">
+  {@render children()}
+</main>