Add refusals tab to the order dashboard

Orders whose Nova Poshta status is a refusal (102/103/105/108) now show
only under «Отказы», whether or not they have a receipt. GET /orders takes
tab=no_receipt|has_receipt|refused instead of has_receipt. NP statuses are
also polled for orders that already have a receipt, until NP reports a
final status.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

backend/tests/test_orders_service.py

@@ -7,10 +7,18 @@ from datetime import UTC, datetime
 from typing import Any
 
 import pytest
+from sqlalchemy.dialects import postgresql
 
 from app.db.models.order import Order
 from app.schemas.orders import OrderUpdateIn
-from app.services.orders import OrderEditError, _parse_crm_datetime, _to_kopecks, update_order
+from app.services.orders import (
+    OrderEditError,
+    OrderTab,
+    _parse_crm_datetime,
+    _to_kopecks,
+    list_orders,
+    update_order,
+)
 
 
 class TestToKopecks:
@@ -148,3 +156,37 @@ class TestUpdateOrder:
         assert asyncio.run(update_order(_FakeSession(None), "1", payload)) is None  # type: ignore[arg-type]
         deleted = _FakeSession(_order(is_deleted=True))
         assert asyncio.run(update_order(deleted, "1", payload)) is None  # type: ignore[arg-type]
+
+
+class _CapturingSession:
+    def __init__(self) -> None:
+        self.statement: Any = None
+
+    async def scalars(self, statement: Any) -> list[Order]:
+        self.statement = statement
+        return []
+
+
+def _list_where(tab: OrderTab) -> str:
+    """WHERE-часть запроса вкладки (SELECT перечисляет все колонки, в т.ч. receipt_created_at)."""
+    session = _CapturingSession()
+    asyncio.run(list_orders(session, tab=tab))  # type: ignore[arg-type]
+    sql = str(
+        session.statement.compile(
+            dialect=postgresql.dialect(), compile_kwargs={"literal_binds": True}
+        )
+    )
+    return sql.split("WHERE", 1)[1]
+
+
+class TestListOrders:
+    def test_refused_tab_filters_by_refusal_codes_only(self) -> None:
+        sql = _list_where(OrderTab.REFUSED)
+        assert "orders.np_status_code IN ('102', '103', '105', '108')" in sql
+        assert "receipt_created_at" not in sql
+
+    @pytest.mark.parametrize("tab", [OrderTab.NO_RECEIPT, OrderTab.HAS_RECEIPT])
+    def test_other_tabs_exclude_refusals(self, tab: OrderTab) -> None:
+        sql = _list_where(tab)
+        assert "NOT IN ('102', '103', '105', '108')" in sql
+        assert "receipt_created_at" in sql