feat: refresh Tencent quotes from GUI

tests/test_ui.py

@@ -14,7 +14,7 @@ def test_formatters_render_money_percent_and_empty_values():
 def test_main_window_can_be_constructed_offscreen(tmp_path, monkeypatch):
     monkeypatch.setenv("QT_QPA_PLATFORM", "offscreen")
 
-    from PySide6.QtWidgets import QApplication
+    from PySide6.QtWidgets import QApplication, QPushButton
 
     from grid_trading.services.trading_service import TradingService
     from grid_trading.ui.main_window import MainWindow
@@ -25,6 +25,7 @@ def test_main_window_can_be_constructed_offscreen(tmp_path, monkeypatch):
 
     assert window.windowTitle() == "Grid Trading Manager"
     assert window.holdings_table.columnCount() > 0
+    assert any(button.text() == "刷新行情" for button in window.findChildren(QPushButton))
 
     window.close()
     service.close()