feat: Fase 2a — shopping lists CRUD

DB: shopping_lists + shopping_items tables with full RLS, pg_cron jobs
(archive completed lists after 7 days, purge trash after 7 days).
item_frequency table with SECURITY DEFINER trigger that normalises and
upserts on every shopping_items INSERT.

Frontend: /lists overview (featured card + 2-col grid + trash toggle),
/lists/[id] detail (qty stepper, inline edit, swipe-to-reveal-delete,
drag & drop reorder via svelte-dnd-action, ItemSuggestions chips).

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

apps/web/messages/es.json

@@ -70,6 +70,23 @@
 	"invite_email_label": "Correo electrónico",
 	"invite_send": "Enviar invitación",
 	"lists_title": "Listas de la compra",
+	"lists_new_list": "Crear",
+	"lists_no_lists": "Sin listas",
+	"lists_create_first": "Crea tu primera lista de la compra",
+	"lists_trash": "Papelera",
+	"list_status_active": "Lista activa",
+	"list_status_completed": "Completada",
+	"list_status_archived": "Archivada",
+	"list_name_placeholder": "p. ej. Compra semanal",
+	"list_items_empty": "Lista vacía",
+	"list_items_empty_hint": "Añade tu primer producto abajo",
+	"list_reset": "Reiniciar lista",
+	"list_archive": "Archivar",
+	"list_delete": "Mover a papelera",
+	"list_actions": "Acciones de lista",
+	"list_item_placeholder": "Añadir producto…",
+	"list_qty_label": "Cant.",
+	"list_unit_label": "Unidad",
 	"list_add_item": "Añadir producto…",
 	"list_to_buy": "Por comprar",
 	"list_checked": "Marcado",