feat: navbar + split list/catalog into separate pages

- Navbar component with List, Catalog, Categories tabs
- / = shopping list (unchecked items with add form)
- /catalog = full catalog with toggle
- /categories = category management
- Removed page titles (navbar indicates context)

1 files changed, 4 insertions, 0 deletions

diff --git a/src/routes/+layout.svelte b/src/routes/+layout.svelte
index db5327e..8ba4f8f 100644
--- a/src/routes/+layout.svelte
+++ b/src/routes/+layout.svelte
@@ -1,4 +1,7 @@
 <script>
+	import '../app.css';
+	import Nav from '$lib/components/Nav.svelte';
+
 	let { children } = $props();
 </script>
 
@@ -7,6 +10,7 @@
 </svelte:head>
 
 <div class="app">
+	<Nav />
 	{@render children()}
 </div>