OpenRGB dedup fix, device card URL badge overflow fix

- Replace threshold-based dedup with exact equality check in OpenRGB client;
  threshold dedup caused animation stutter at low software brightness
- Add brightness_control capability to OpenRGB provider (software simulated)
- Fix device card URL/COM badge overlapping close button: badge stays inside
  card-title flex container, both name and badge truncate with ellipsis

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/src/wled_controller/core/devices/openrgb_client.py

@@ -96,7 +96,7 @@ class OpenRGBLEDClient(LEDClient):
         self._send_pending: Optional[Tuple[np.ndarray, int]] = None  # (pixels, brightness)
         self._send_thread: Optional[threading.Thread] = None
         self._send_stop = threading.Event()
-        self._last_sent_pixels: Optional[np.ndarray] = None  # for change-threshold dedup
+        self._last_sent_pixels: Optional[np.ndarray] = None
 
     async def connect(self) -> bool:
         """Connect to OpenRGB server and access the target device."""
@@ -295,10 +295,10 @@ class OpenRGBLEDClient(LEDClient):
 
         # Change-threshold dedup — compare RAW pixels before brightness scaling
         # so low brightness doesn't crush differences below the threshold.
-        # GPU I2C/SMBus writes cause system-wide stalls; minimizing writes is critical.
+        # Exact-match dedup — skip only if pixels are identical to last sent frame.
+        # Threshold-based dedup caused stutter at low brightness.
         if self._last_sent_pixels is not None and self._last_sent_pixels.shape == pixel_array.shape:
-            diff = np.mean(np.abs(pixel_array.astype(np.int16) - self._last_sent_pixels.astype(np.int16)))
-            if diff < 2.0:
+            if np.array_equal(pixel_array, self._last_sent_pixels):
                 return
         self._last_sent_pixels = pixel_array.copy()