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/en.json

@@ -70,6 +70,23 @@
 	"invite_email_label": "Email address",
 	"invite_send": "Send invitation",
 	"lists_title": "Shopping Lists",
+	"lists_new_list": "Create",
+	"lists_no_lists": "No lists yet",
+	"lists_create_first": "Create your first shopping list",
+	"lists_trash": "Trash",
+	"list_status_active": "Active List",
+	"list_status_completed": "Completed",
+	"list_status_archived": "Archived",
+	"list_name_placeholder": "e.g. Weekly shop",
+	"list_items_empty": "List is empty",
+	"list_items_empty_hint": "Add your first item below",
+	"list_reset": "Reset list",
+	"list_archive": "Archive",
+	"list_delete": "Move to trash",
+	"list_actions": "List actions",
+	"list_item_placeholder": "Add item (e.g. Yogurt 500g)",
+	"list_qty_label": "Qty",
+	"list_unit_label": "Unit",
 	"list_add_item": "Add item…",
 	"list_to_buy": "To buy",
 	"list_checked": "Checked",