feat(ui): scaffold SvelteKit app with Tailwind v4, adapter-node, zinc/amber theme

ui/src/routes/+layout.svelte

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+<script lang="ts">
+	import '../app.css';
+
+	let { children } = $props();
+</script>
+
+<svelte:head>
+	<meta charset="utf-8" />
+	<meta name="viewport" content="width=device-width, initial-scale=1" />
+	<title>libnovel</title>
+</svelte:head>
+
+<div class="min-h-screen flex flex-col">
+	<header class="border-b border-zinc-700 bg-zinc-900 sticky top-0 z-50">
+		<nav class="max-w-6xl mx-auto px-4 h-14 flex items-center gap-6">
+			<a href="/" class="text-amber-400 font-bold text-lg tracking-tight hover:text-amber-300">
+				libnovel
+			</a>
+			<a href="/books" class="text-zinc-400 hover:text-zinc-100 text-sm transition-colors">
+				Library
+			</a>
+		</nav>
+	</header>
+
+	<main class="flex-1 max-w-6xl mx-auto w-full px-4 py-8">
+		{@render children()}
+	</main>
+
+	<footer class="border-t border-zinc-800 text-zinc-600 text-xs text-center py-4">
+		libnovel
+	</footer>
+</div>

ui/src/routes/+page.svelte

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+<a href="/books" class="inline-block mt-4 px-6 py-3 bg-amber-400 text-zinc-900 font-semibold rounded hover:bg-amber-300 transition-colors">
+	Browse Library
+</a>