feat: add grid level suggestions

tests/test_ui.py

@@ -35,6 +35,26 @@ def test_main_window_can_be_constructed_offscreen(tmp_path, monkeypatch):
     app.processEvents()
 
 
+def test_main_window_contains_grid_level_table(tmp_path, monkeypatch):
+    monkeypatch.setenv("QT_QPA_PLATFORM", "offscreen")
+
+    from PySide6.QtWidgets import QApplication, QGroupBox
+
+    from grid_trading.services.trading_service import TradingService
+    from grid_trading.ui.main_window import MainWindow
+
+    app = QApplication.instance() or QApplication([])
+    service = TradingService(tmp_path / "grid.db")
+    window = MainWindow(service)
+
+    assert window.grid_levels_table.columnCount() == 7
+    assert any(group.title() == "网格档位" for group in window.findChildren(QGroupBox))
+
+    window.close()
+    service.close()
+    app.processEvents()
+
+
 def test_instrument_dialog_does_not_collect_manual_current_price(monkeypatch):
     monkeypatch.setenv("QT_QPA_PLATFORM", "offscreen")