device: seed Centurion device kind=headset at construction

Centurion-transport devices have no static descriptor and are not
receiver-paired, so their kind was only resolved by an online feature
scan. A headset powered off when Solaar started showed no kind, hence
no headphone icon in the tray/window — unlike receiver-paired mice and
keyboards, whose kind comes from the receiver's persistent pairing
registers.

Every Centurion-transport device seen so far is a headset, and the
centurion flag is known at construction time. Seed _kind=headset there
so the icon is correct offline and on first run. Drop the now-dead
online _infer_kind_centurion() feature scan and its Centurion branch
in the kind property.

lib/logitech_receiver/device.py

@@ -146,6 +146,8 @@ class Device:
         self.status_callback = None  # for changes to other potentially visible aspects
         self.wpid = pairing_info["wpid"] if pairing_info else None  # the Wireless PID is unique per device model
         self._kind = pairing_info["kind"] if pairing_info else None  # mouse, keyboard, etc (see hidpp10.DEVICE_KIND)
+        if self._kind is None and self.centurion:
+            self._kind = hidpp10_constants.DEVICE_KIND.headset  # every Centurion-transport device so far is a headset
         self._serial = pairing_info["serial"] if pairing_info else None  # serial number (an 8-char hex string)
         self._polling_rate = pairing_info["polling"] if pairing_info else None
         self._power_switch = pairing_info["power_switch"] if pairing_info else None
@@ -322,27 +324,12 @@ class Device:
 
     @property
     def kind(self):
+        # Centurion devices are seeded with kind=headset at construction, so
+        # this online lookup only runs for descriptor-less HID++ 2.0 devices.
         if not self._kind and self.online and self.protocol >= 2.0:
-            if self.centurion:
-                self._kind = self._infer_kind_centurion()
-            else:
-                self._kind = _hidpp20.get_kind(self)
+            self._kind = _hidpp20.get_kind(self)
         return self._kind or "?"
 
-    def _infer_kind_centurion(self):
-        """Infer device kind from Centurion features (sub-device or top-level)."""
-        # Check sub-device features (wireless via bridge)
-        for feature in getattr(self, "_centurion_sub_features", ()):
-            if isinstance(feature, int) and 0x0600 <= feature <= 0x06FF:
-                return hidpp10_constants.DEVICE_KIND.headset
-        # Check top-level features (direct USB connection, no bridge)
-        if self.features:
-            for feature, _index in self.features.enumerate():
-                feat_int = int(feature) if isinstance(feature, int) else 0
-                if 0x0600 <= feat_int <= 0x06FF:
-                    return hidpp10_constants.DEVICE_KIND.headset
-        return None
-
     @property
     def firmware(self) -> tuple[common.FirmwareInfo]:
         if self._firmware is None and self.online:

tests/logitech_receiver/fake_hidpp.py

@@ -403,7 +403,6 @@ class Device:
     gestures = device.Device.gestures
     __hash__ = device.Device.__hash__
     feature_request = device.Device.feature_request
-    _infer_kind_centurion = device.Device._infer_kind_centurion
 
     def __post_init__(self):
         self._name = self.name

tests/logitech_receiver/test_device.py

@@ -108,6 +108,10 @@ def test_create_centurion_device():
     assert test_device.hidpp_long is True
     assert int(test_device.handle) in base._centurion_handles
 
+    # kind is seeded at construction, so the headset icon shows even offline
+    test_device.online = False
+    assert test_device.kind == "headset"
+
     # Clean up
     base._centurion_handles.discard(int(test_device.handle))
 

tests/logitech_receiver/test_hidpp20_complex.py

@@ -1116,21 +1116,6 @@ def test_centurion_sub_device_hardware_info():
     assert product_id == 0x0AF7
 
 
-def test_centurion_kind_inference():
-    """Centurion device with 0x06xx audio features infers kind=headset."""
-    dev = fake_hidpp.Device("CENT_KIND", True, 2.6, fake_hidpp.r_centurion_headset, centurion=True)
-    dev._centurion_sub_features = {
-        hidpp20_constants.SupportedFeature.HEADSET_AUDIO_SIDETONE,
-        hidpp20_constants.SupportedFeature.HEADSET_MIC_MUTE,
-    }
-
-    kind = dev._infer_kind_centurion()
-
-    from logitech_receiver import hidpp10_constants
-
-    assert kind == hidpp10_constants.DEVICE_KIND.headset
-
-
 # --- CenturionReceiver tests ---