Add LED type detection, improve device card layout

- Detect LED chip type (WS2812B, SK6812, etc.) from WLED /json/cfg
- Show RGBW/RGB channel indicator with colored squares on device card
- Move version, display index, LED count to subtitle row under device name
- Add remove button as × icon in top-right corner of card
- Hide latency from card display (still visible in health dot tooltip)
- Fix display layout overflow on narrow viewports
- Add wled_rgbw and wled_led_type to ProcessingState API schema

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

server/src/wled_controller/api/schemas.py

@@ -172,6 +172,8 @@ class ProcessingState(BaseModel):
     wled_name: Optional[str] = Field(None, description="WLED device name")
     wled_version: Optional[str] = Field(None, description="WLED firmware version")
     wled_led_count: Optional[int] = Field(None, description="LED count reported by WLED device")
+    wled_rgbw: Optional[bool] = Field(None, description="Whether WLED device uses RGBW LEDs")
+    wled_led_type: Optional[str] = Field(None, description="LED chip type (e.g. WS2812B, SK6812 RGBW)")
     wled_last_checked: Optional[datetime] = Field(None, description="Last health check time")
     wled_error: Optional[str] = Field(None, description="Last health check error")