feat(shopping): Einkaufslisten-Seite mit Empty-State

src/routes/shopping-list/+page.svelte

@@ -0,0 +1,49 @@
+<script lang="ts">
+  import { onMount } from 'svelte';
+  import { ShoppingCart } from 'lucide-svelte';
+  import type { ShoppingListSnapshot } from '$lib/server/shopping/repository';
+
+  let snapshot = $state<ShoppingListSnapshot>({ recipes: [], rows: [], uncheckedCount: 0 });
+  let loading = $state(true);
+
+  async function load() {
+    loading = true;
+    try {
+      const res = await fetch('/api/shopping-list');
+      snapshot = await res.json();
+    } finally {
+      loading = false;
+    }
+  }
+
+  onMount(load);
+</script>
+
+<header class="head">
+  <h1>Einkaufsliste</h1>
+  {#if snapshot.recipes.length > 0}
+    <p class="sub">
+      {snapshot.uncheckedCount} noch zu besorgen · {snapshot.recipes.length} Rezept{snapshot.recipes.length === 1 ? '' : 'e'} im Wagen
+    </p>
+  {/if}
+</header>
+
+{#if loading}
+  <p class="muted">Lädt …</p>
+{:else if snapshot.recipes.length === 0}
+  <section class="empty">
+    <div class="big"><ShoppingCart size={48} strokeWidth={1.5} /></div>
+    <p>Einkaufswagen ist leer.</p>
+    <p class="hint">Lege Rezepte auf der Wunschliste in den Wagen, um sie hier zu sehen.</p>
+  </section>
+{/if}
+
+<style>
+  .head { padding: 1.25rem 0 0.5rem; }
+  .head h1 { margin: 0; font-size: 1.6rem; color: #2b6a3d; }
+  .sub { margin: 0.2rem 0 0; color: #666; }
+  .muted { color: #888; text-align: center; padding: 2rem 0; }
+  .empty { text-align: center; padding: 3rem 1rem; }
+  .big { color: #8fb097; display: inline-flex; margin: 0 0 0.5rem; }
+  .hint { color: #888; font-size: 0.9rem; }
+</style>