Add WebSocket device type, capability-driven settings, hide filter on collapse

- New WS device type: broadcaster singleton + LEDClient that sends binary
  frames to connected WebSocket clients during processing
- FastAPI WS endpoint at /api/v1/devices/{device_id}/ws with token auth
- Frontend: add/edit WS devices, connection URL with copy button in settings
- Add health_check and auto_restore capabilities to WLED and Serial providers;
  hide health interval and auto-restore toggle for devices without them
- Skip health check loop for virtual devices (Mock, MQTT, WS) — set always-online
- Copy buttons and labels for API CSS push endpoints (REST POST / WebSocket)
- Hide mock:// and ws:// URLs in target device dropdown
- Hide filter textbox when card section is collapsed (cs-collapsed CSS class)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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

@@ -285,5 +285,8 @@ def _register_builtin_providers():
     from wled_controller.core.devices.mqtt_provider import MQTTDeviceProvider
     register_provider(MQTTDeviceProvider())
 
+    from wled_controller.core.devices.ws_provider import WSDeviceProvider
+    register_provider(WSDeviceProvider())
+
 
 _register_builtin_providers()

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

@@ -28,7 +28,9 @@ class SerialDeviceProvider(LEDDeviceProvider):
         # manual_led_count: user must specify LED count (can't auto-detect)
         # power_control: can blank LEDs by sending all-black pixels
         # brightness_control: software brightness (multiplies pixel values before sending)
-        return {"manual_led_count", "power_control", "brightness_control"}
+        # health_check: serial port availability probe
+        # auto_restore: blank LEDs when targets stop
+        return {"manual_led_count", "power_control", "brightness_control", "health_check", "auto_restore"}
 
     async def check_health(self, url: str, http_client, prev_health=None) -> DeviceHealth:
         # Generic serial port health check — enumerate COM ports

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

@@ -49,7 +49,7 @@ class WLEDDeviceProvider(LEDDeviceProvider):
 
     @property
     def capabilities(self) -> set:
-        return {"brightness_control", "power_control", "standby_required", "static_color"}
+        return {"brightness_control", "power_control", "standby_required", "static_color", "health_check", "auto_restore"}
 
     def create_client(self, url: str, **kwargs) -> LEDClient:
         from wled_controller.core.devices.wled_client import WLEDClient

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

@@ -0,0 +1,130 @@
+"""WebSocket LED client — broadcasts pixel data to connected WebSocket clients."""
+
+import asyncio
+from datetime import datetime
+from typing import Dict, List, Optional, Tuple, Union
+
+import numpy as np
+
+from wled_controller.core.devices.led_client import DeviceHealth, LEDClient
+from wled_controller.utils import get_logger
+
+logger = get_logger(__name__)
+
+
+class WSDeviceBroadcaster:
+    """Global registry of WebSocket clients subscribed to WS device streams.
+
+    Each WS device (identified by device_id) can have zero or more connected
+    WebSocket clients.  The WSLEDClient.send_pixels() method uses this to
+    broadcast frames.
+    """
+
+    def __init__(self):
+        self._clients: Dict[str, List] = {}
+
+    def add_client(self, device_id: str, ws) -> None:
+        self._clients.setdefault(device_id, []).append(ws)
+        logger.info(
+            "WS device %s: client connected (%d total)",
+            device_id, len(self._clients[device_id]),
+        )
+
+    def remove_client(self, device_id: str, ws) -> None:
+        clients = self._clients.get(device_id)
+        if clients and ws in clients:
+            clients.remove(ws)
+            logger.info(
+                "WS device %s: client disconnected (%d remaining)",
+                device_id, len(clients),
+            )
+
+    def get_clients(self, device_id: str) -> List:
+        return self._clients.get(device_id, [])
+
+
+_broadcaster = WSDeviceBroadcaster()
+
+
+def get_ws_broadcaster() -> WSDeviceBroadcaster:
+    return _broadcaster
+
+
+def parse_ws_url(url: str) -> str:
+    """Extract device_id from a ws:// URL.
+
+    Format: ws://device-id
+    """
+    if url.startswith("ws://"):
+        return url[5:]
+    return url
+
+
+class WSLEDClient(LEDClient):
+    """Broadcasts binary pixel data to WebSocket clients via the global broadcaster."""
+
+    def __init__(self, url: str, led_count: int = 0, **kwargs):
+        self._device_id = parse_ws_url(url)
+        self._led_count = led_count
+        self._connected = False
+
+    async def connect(self) -> bool:
+        self._connected = True
+        logger.info("WS device client connected for device %s", self._device_id)
+        return True
+
+    async def close(self) -> None:
+        self._connected = False
+        logger.info("WS device client closed for device %s", self._device_id)
+
+    @property
+    def is_connected(self) -> bool:
+        return self._connected
+
+    async def send_pixels(
+        self,
+        pixels: Union[List[Tuple[int, int, int]], np.ndarray],
+        brightness: int = 255,
+    ) -> bool:
+        if not self._connected:
+            return False
+
+        clients = _broadcaster.get_clients(self._device_id)
+        if not clients:
+            return True
+
+        # Build binary frame: [brightness_byte][R G B R G B ...]
+        if isinstance(pixels, np.ndarray):
+            pixel_bytes = pixels.astype(np.uint8).tobytes()
+        else:
+            pixel_bytes = bytes(c for rgb in pixels for c in rgb)
+
+        data = bytes([brightness]) + pixel_bytes
+
+        async def _send_safe(ws):
+            try:
+                await ws.send_bytes(data)
+                return True
+            except Exception:
+                return False
+
+        results = await asyncio.gather(*[_send_safe(ws) for ws in clients])
+
+        disconnected = [ws for ws, ok in zip(clients, results) if not ok]
+        for ws in disconnected:
+            _broadcaster.remove_client(self._device_id, ws)
+
+        return True
+
+    @classmethod
+    async def check_health(
+        cls,
+        url: str,
+        http_client,
+        prev_health: Optional[DeviceHealth] = None,
+    ) -> DeviceHealth:
+        return DeviceHealth(
+            online=True,
+            latency_ms=0.0,
+            last_checked=datetime.utcnow(),
+        )

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

@@ -0,0 +1,44 @@
+"""WebSocket device provider — factory, validation, health checks."""
+
+from datetime import datetime
+from typing import List
+
+from wled_controller.core.devices.led_client import (
+    DeviceHealth,
+    DiscoveredDevice,
+    LEDClient,
+    LEDDeviceProvider,
+)
+from wled_controller.core.devices.ws_client import WSLEDClient, parse_ws_url
+from wled_controller.utils import get_logger
+
+logger = get_logger(__name__)
+
+
+class WSDeviceProvider(LEDDeviceProvider):
+    """Provider for WebSocket-based virtual LED devices."""
+
+    @property
+    def device_type(self) -> str:
+        return "ws"
+
+    @property
+    def capabilities(self) -> set:
+        return {"manual_led_count"}
+
+    def create_client(self, url: str, **kwargs) -> LEDClient:
+        return WSLEDClient(url, **kwargs)
+
+    async def check_health(
+        self, url: str, http_client, prev_health=None,
+    ) -> DeviceHealth:
+        return DeviceHealth(
+            online=True, latency_ms=0.0, last_checked=datetime.utcnow(),
+        )
+
+    async def validate_device(self, url: str) -> dict:
+        """Validate WS device URL — accepts any URL since it will be auto-set."""
+        return {}
+
+    async def discover(self, timeout: float = 3.0) -> List[DiscoveredDevice]:
+        return []