test(client): tighten polling test synchronization

client/tests/polling/test_coordinator.py

@@ -134,8 +134,10 @@ class FakeConsumer:
 def wait_until(predicate, timeout_ms: int = 2000) -> None:
     elapsed = 0
     while not predicate() and elapsed < timeout_ms:
-        QTest.qWait(10)
-        elapsed += 10
+        # worker 仍通过真实 Qt 队列信号推进，因此测试必须持续处理事件；
+        # 1 ms 量子既会让出 QThread，又不会把每次状态转换放大成 10 ms 等待。
+        QTest.qWait(1)
+        elapsed += 1
     if not predicate():
         raise AssertionError("condition_not_reached")
 
@@ -199,7 +201,6 @@ class PollingCoordinatorTests(unittest.TestCase):
         gateway = FakeGateway()
         coordinator, frozen = self.make_coordinator(store, gateway, None)
         coordinator.start()
-        QTest.qWait(20)
         self.assertEqual(coordinator.state, PollingState.BLOCKED)
         self.assertIn("尚未接入", coordinator.reason)
         self.assertEqual(store.start_calls, 0)
@@ -316,8 +317,9 @@ class PollingCoordinatorTests(unittest.TestCase):
                 coordinator.configuration_freeze_changed.connect(freeze_events.append)
                 coordinator.start()
                 wait_until(lambda: coordinator.state == PollingState.BLOCKED and not coordinator.operation_in_flight)
-                QTest.qWait(30)
                 self.assertEqual(gateway.calls, 1)
+                self.assertFalse(coordinator._timer.isActive())
+                self.assertIsNone(coordinator._scheduled_epoch)
                 self.assertFalse(store.current.session.accept_new)
                 self.assertEqual(freeze_events[-1], expected_frozen)