device: use full live name for direct-USB codename

When a receiver-paired mouse/keyboard is plugged in directly over USB,
it has no receiver to supply a codename. If it also lacks the
DEVICE_FRIENDLY_NAME feature (0x0007), the codename property fell back
to name.split(" ")[0] — truncating a good name like "G502 X PLUS" to
"G502" at the first space.

Use the full live device name instead, only dropping a leading
"Logitech" word. The live name is always accurate to the current
connection — unlike a persisted copy, which can go stale for devices
that report mode-variant names (e.g. a headset's "- Wireless Mode" vs
"- Wired Mode"). This matches what the centurion branch already does.

lib/logitech_receiver/device.py

@@ -252,11 +252,14 @@ class Device:
                 if not self.centurion:
                     self._codename = _hidpp20.get_friendly_name(self)
                 if not self._codename and self.name:
-                    if self.centurion:
-                        self._codename = self.name
+                    # Use the full live name; only drop a leading "Logitech".
+                    # Truncating at the first space mangled good names like
+                    # "G502 X PLUS" (direct USB connection, no friendly name).
+                    names = self.name.split(" ")
+                    if not self.centurion and len(names) > 1 and names[0] == "Logitech":
+                        self._codename = " ".join(names[1:])
                     else:
-                        names = self.name.split(" ")
-                        self._codename = names[1 if len(names) > 1 and names[0] == "Logitech" else 0]
+                        self._codename = self.name
             if not self._codename and self.receiver:
                 codename = self.receiver.device_codename(self.number)
                 if codename:

tests/logitech_receiver/test_device.py

@@ -130,6 +130,23 @@ def test_device_name(device_info, responses, expected_codename, expected_name, e
     assert test_device.kind == expected_kind
 
 
+def test_codename_uses_full_name():
+    """A direct-connected HID++ 2.0 device with no friendly name uses its full
+    live name as the codename instead of truncating it at the first space."""
+    test_device = device.create_device(LowLevelInterfaceFake(fake_hidpp.r_empty), di_CCCC)
+    test_device._protocol = 2.0
+    test_device.online = True
+
+    test_device._codename = None
+    test_device._name = "G502 X PLUS"
+    assert test_device.codename == "G502 X PLUS"
+
+    # a leading "Logitech" is still dropped
+    test_device._codename = None
+    test_device._name = "Logitech MX Master 3"
+    assert test_device.codename == "MX Master 3"
+
+
 @pytest.mark.parametrize(
     "device_info, responses, handle, _name, _codename, number, protocol, registers",
     zip(