feat(q7): add set_button_lights trait method (#843)

* feat(q7): add set_button_light trait method

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* refactor(q7): rename set_button_light to set_button_lights

The setting toggles multiple button lights, so the plural name matches
what the app calls it ("Button Lights"), as agreed in review.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-authored-by: Allen Porter <allen.porter@gmail.com>
Co-authored-by: Luke Lashley <conway220@gmail.com>

Author: 4 people

roborock/devices/traits/b01/q7/__init__.py

@@ -164,6 +164,10 @@ async def set_do_not_disturb(self, enabled: bool, begin_time: int, end_time: int
             },
         )
 
+    async def set_button_lights(self, enabled: bool) -> None:
+        """Enable or disable the button/panel lights."""
+        await self.set_prop(RoborockB01Props.LIGHT_MODE, int(enabled))
+
     async def start_clean(self) -> None:
         """Start cleaning."""
         await self.send(

tests/devices/traits/b01/q7/test_init.py

@@ -236,6 +236,26 @@ async def test_q7_api_set_do_not_disturb_invalid_time(
     assert len(fake_channel.published_commands) == 0
 
 
+@pytest.mark.parametrize(
+    ("enabled", "expected_code"),
+    [(True, 1), (False, 0)],
+)
+async def test_q7_api_set_button_lights(
+    enabled: bool,
+    expected_code: int,
+    q7_api: Q7PropertiesApi,
+    fake_channel: FakeQ7Channel,
+):
+    """Test toggling the button/panel lights."""
+    fake_channel.response_queue.append({"result": "ok"})
+    await q7_api.set_button_lights(enabled)
+
+    assert len(fake_channel.published_commands) == 1
+    command, params = fake_channel.published_commands[0]
+    assert command == RoborockB01Q7Methods.SET_PROP
+    assert params == {RoborockB01Props.LIGHT_MODE: expected_code}
+
+
 @pytest.mark.parametrize(
     ("mode", "expected_code"),
     [