refactor(shopping): listShoppingList - Pipe-safe name/family lookup

Liest nameKey und familyKey direkt von members[0] statt den
Composite-Key am Pipe-Zeichen zu splitten. Verhindert falsche
Dekodierung bei Zutaten wie "Fleisch- | Wurstwaren".

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

src/lib/server/shopping/repository.ts

@@ -128,8 +128,9 @@ export function listShoppingList(
   }
 
   const rows: ShoppingListRow[] = [];
-  for (const [key, members] of grouped) {
-    const [nameKey, familyKey] = key.split('|');
+  for (const members of grouped.values()) {
+    const nameKey = members[0].name_key;
+    const familyKey = unitFamily(members[0].unit_key);
     const consolidated = consolidate(
       members.map((m) => ({ quantity: m.total_quantity, unit: m.display_unit }))
     );