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/static/css/cards.css

@@ -451,6 +451,15 @@ body.cs-drag-active .card-drag-handle {
     font-family: monospace;
     text-decoration: none;
     transition: background 0.2s;
+    white-space: nowrap;
+    flex-shrink: 1;
+    overflow: hidden;
+    min-width: 0;
+}
+
+.device-url-text {
+    overflow: hidden;
+    text-overflow: ellipsis;
 }
 
 .device-url-badge:hover {