Chats: show which order a provider writes about, or that there is no order

- Provider messages store the order that was current when they wrote: a started
  order first, otherwise the nearest assigned one within -4h..+12h; none — "no order".
- Admin chat: order tag above each provider message, "now / next" order strip in
  the conversation header, order number (or "no order") in the thread list.
- Telegram notification to the team gets an order line or "no current order".
- Test for the order-picking rule; demo shows both cases.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

packages/i18n/locales/es.json

@@ -869,7 +869,9 @@
       "channelSupport": "Soporte",
       "channelConcierge": "Conserje",
       "file": "archivo",
-      "chatAssigned": "{{by}} te ha pasado una conversación: {{name}}"
+      "chatAssigned": "{{by}} te ha pasado una conversación: {{name}}",
+      "order": "Pedido n.º {{number}}",
+      "noOrder": "Sin pedido en curso"
     },
     "partner": {
       "valid": "{{name}} — {{level}}, tarjeta válida",