Add OpenRGB per-zone LED control with separate/combined modes and zone preview

- Zone picker UI in device add/settings modals with per-zone checkbox selection
- Combined mode: pixels distributed sequentially across zones
- Separate mode: full effect resampled independently to each zone via linear interpolation
- Per-zone LED preview in target cards: one canvas strip per zone with hover overlay labels
- Zone badges on device cards enriched with actual LED counts from OpenRGB API
- Fix stale led_count by using device_led_count discovered at connect time

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

server/src/wled_controller/storage/device_store.py

@@ -32,6 +32,7 @@ class Device:
         auto_shutdown: bool = False,
         send_latency_ms: int = 0,
         rgbw: bool = False,
+        zone_mode: str = "combined",
         created_at: Optional[datetime] = None,
         updated_at: Optional[datetime] = None,
     ):
@@ -46,6 +47,7 @@ class Device:
         self.auto_shutdown = auto_shutdown
         self.send_latency_ms = send_latency_ms
         self.rgbw = rgbw
+        self.zone_mode = zone_mode
         self.created_at = created_at or datetime.utcnow()
         self.updated_at = updated_at or datetime.utcnow()
 
@@ -71,6 +73,8 @@ class Device:
             d["send_latency_ms"] = self.send_latency_ms
         if self.rgbw:
             d["rgbw"] = True
+        if self.zone_mode != "combined":
+            d["zone_mode"] = self.zone_mode
         return d
 
     @classmethod
@@ -88,6 +92,7 @@ class Device:
             auto_shutdown=data.get("auto_shutdown", False),
             send_latency_ms=data.get("send_latency_ms", 0),
             rgbw=data.get("rgbw", False),
+            zone_mode=data.get("zone_mode", "combined"),
             created_at=datetime.fromisoformat(data.get("created_at", datetime.utcnow().isoformat())),
             updated_at=datetime.fromisoformat(data.get("updated_at", datetime.utcnow().isoformat())),
         )
@@ -175,6 +180,7 @@ class DeviceStore:
         auto_shutdown: bool = False,
         send_latency_ms: int = 0,
         rgbw: bool = False,
+        zone_mode: str = "combined",
     ) -> Device:
         """Create a new device."""
         device_id = f"device_{uuid.uuid4().hex[:8]}"
@@ -193,6 +199,7 @@ class DeviceStore:
             auto_shutdown=auto_shutdown,
             send_latency_ms=send_latency_ms,
             rgbw=rgbw,
+            zone_mode=zone_mode,
         )
 
         self._devices[device_id] = device
@@ -220,6 +227,7 @@ class DeviceStore:
         auto_shutdown: Optional[bool] = None,
         send_latency_ms: Optional[int] = None,
         rgbw: Optional[bool] = None,
+        zone_mode: Optional[str] = None,
     ) -> Device:
         """Update device."""
         device = self._devices.get(device_id)
@@ -242,6 +250,8 @@ class DeviceStore:
             device.send_latency_ms = send_latency_ms
         if rgbw is not None:
             device.rgbw = rgbw
+        if zone_mode is not None:
+            device.zone_mode = zone_mode
 
         device.updated_at = datetime.utcnow()
         self.save()