Fix SMARTCAM Time module and update tests (#1659)

Update SmartCam time handling to apply timezone-only changes with explicit warnings, while keeping common time and CLI tests focused on devices that support setting clock time and adding SmartCam-specific coverage for the special behavior.

tests/test_cli.py

@@ -481,6 +481,7 @@ async def test_time_sync(dev, mocker, runner):
     assert "New time: " in res.output
 
 
+@parametrize_combine([device_smart, device_iot])
 async def test_time_set(dev: Device, mocker, runner):
     """Test time set command."""
     time_mod = dev.modules[Module.Time]