Phase 1: scaffold, types, schema, layout shell

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/routes/+layout.svelte

@@ -0,0 +1,26 @@
+<script lang="ts">
+  import '@picocss/pico/css/pico.min.css';
+
+  let { children } = $props();
+</script>
+
+<header>
+  <nav class="container">
+    <ul>
+      <li><strong>Humor Units</strong></li>
+    </ul>
+    <ul>
+      <li><a href="/">Converter</a></li>
+      <li><a href="/about">About</a></li>
+      <li><a href="/contact">Contact</a></li>
+    </ul>
+  </nav>
+</header>
+
+<main class="container">
+  {@render children()}
+</main>
+
+<footer class="container">
+  <small>Humor Units — invented conversions for invented purposes</small>
+</footer>