fix: HA light target — brightness source, transition=0, dashboard type label

- Add brightness_value_source_id to HALightOutputTarget model, to_dict,
  from_dict, update_fields, register_with_manager, API response
- Wire value stream in HALightTargetProcessor: acquire/release on
  start/stop, multiply brightness in _update_lights loop
- Fix transition=0 not saving (parseFloat("0") || 0.5 was falsy)
- Fix dashboard showing "Key Colors" for HA targets — now "Home Assistant"
- Fix dashboard FPS showing 0/2 — HA targets show target/target
- Add CSS source subtitle to HA target dashboard cards

custom_components/wled_screen_controller/const.py

@@ -15,9 +15,8 @@ WS_MAX_RECONNECT_DELAY = 60  # seconds
 
 # Target types
 TARGET_TYPE_LED = "led"
-TARGET_TYPE_KEY_COLORS = "key_colors"
+TARGET_TYPE_HA_LIGHT = "ha_light"
 
 # Data keys stored in hass.data[DOMAIN][entry_id]
 DATA_COORDINATOR = "coordinator"
-DATA_WS_MANAGER = "ws_manager"
 DATA_EVENT_LISTENER = "event_listener"