Enhance routing and layout for site-specific pages. Added support for dynamic site routes, updated component imports, and improved layout styles for fullscreen display. Refactored navigation to utilize site data for dynamic button generation.

src/routes/[site]/+page.svelte

@@ -0,0 +1,32 @@
+<script lang="ts">
+  import { Button } from '$lib/components/ui/button';
+
+  let { data }: {
+    data: { slug: string; url: string; title: string };
+  } = $props();
+</script>
+
+<svelte:head>
+  <title>{data.title} — Base</title>
+</svelte:head>
+
+<main class="relative flex-1 min-h-0 min-w-0 flex flex-col">
+  <iframe
+    id="app-iframe"
+    title={data.title}
+    src={data.url}
+    class="absolute inset-0 w-full h-full border-0 rounded-none"
+  />
+  <div
+    class="absolute top-2 left-1/2 -translate-x-1/2 z-10 flex items-center justify-center pointer-events-none pt-[env(safe-area-inset-top)]"
+    aria-hidden="true"
+  >
+    <div class="pointer-events-auto">
+      <a href="/">
+        <Button type="button" variant="secondary" class="shadow-md">
+          Base
+        </Button>
+      </a>
+    </div>
+  </div>
+</main>