Remove idle color feature, simplify power to turn-off only, fix settings serial port bug

- Remove static/idle color from entire stack (storage, API, processing, UI, CSS, locales)
- Simplify device power button to turn-off only (send black frame, no toggle)
- Send black frame on serial port close (AdalightClient.close)
- Fix settings modal serial port dropdown showing WLED devices due to stale deviceType

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

server/src/wled_controller/storage/device_store.py

@@ -4,7 +4,7 @@ import json
 import uuid
 from datetime import datetime
 from pathlib import Path
-from typing import Dict, List, Optional, Tuple
+from typing import Dict, List, Optional
 
 from wled_controller.utils import get_logger
 
@@ -30,7 +30,6 @@ class Device:
         baud_rate: Optional[int] = None,
         software_brightness: int = 255,
         auto_shutdown: bool = False,
-        static_color: Optional[Tuple[int, int, int]] = None,
         created_at: Optional[datetime] = None,
         updated_at: Optional[datetime] = None,
     ):
@@ -43,7 +42,6 @@ class Device:
         self.baud_rate = baud_rate
         self.software_brightness = software_brightness
         self.auto_shutdown = auto_shutdown
-        self.static_color = static_color
         self.created_at = created_at or datetime.utcnow()
         self.updated_at = updated_at or datetime.utcnow()
         # Preserved from old JSON for migration — not written back
@@ -67,8 +65,6 @@ class Device:
             d["software_brightness"] = self.software_brightness
         if self.auto_shutdown:
             d["auto_shutdown"] = True
-        if self.static_color is not None:
-            d["static_color"] = list(self.static_color)
         return d
 
     @classmethod
@@ -78,9 +74,6 @@ class Device:
         Backward-compatible: reads legacy 'calibration' field and stores it
         in _legacy_calibration for migration use only.
         """
-        static_color_raw = data.get("static_color")
-        static_color = tuple(static_color_raw) if static_color_raw else None
-
         device = cls(
             device_id=data["id"],
             name=data["name"],
@@ -91,7 +84,6 @@ class Device:
             baud_rate=data.get("baud_rate"),
             software_brightness=data.get("software_brightness", 255),
             auto_shutdown=data.get("auto_shutdown", False),
-            static_color=static_color,
             created_at=datetime.fromisoformat(data.get("created_at", datetime.utcnow().isoformat())),
             updated_at=datetime.fromisoformat(data.get("updated_at", datetime.utcnow().isoformat())),
         )
@@ -250,18 +242,6 @@ class DeviceStore:
         logger.info(f"Updated device {device_id}")
         return device
 
-    def set_static_color(
-        self, device_id: str, color: Optional[Tuple[int, int, int]]
-    ) -> "Device":
-        """Set or clear the static idle color for a device."""
-        device = self._devices.get(device_id)
-        if not device:
-            raise ValueError(f"Device {device_id} not found")
-        device.static_color = color
-        device.updated_at = datetime.utcnow()
-        self.save()
-        return device
-
     def delete_device(self, device_id: str):
         """Delete device."""
         if device_id not in self._devices: