Replace HAOS light entity with select entities, add zero-brightness optimization

- Remove light.py platform (static color control via HA light entity)
- Add select.py with CSS Source and Brightness Source dropdowns for LED targets
- Coordinator now fetches color-strip-sources and value-sources lists
- Add generic update_target() method for partial target updates
- Clean up stale device registry entries on integration reload
- Skip frame sends when effective brightness is ~0 (suppresses unnecessary
  UDP/HTTP traffic while LEDs are dark)

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

custom_components/wled_screen_controller/__init__.py

@@ -31,7 +31,7 @@ PLATFORMS: list[Platform] = [
     Platform.SWITCH,
     Platform.SENSOR,
     Platform.NUMBER,
-    Platform.LIGHT,
+    Platform.SELECT,
 ]
 
 
@@ -57,8 +57,9 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     event_listener = EventStreamListener(hass, server_url, api_key, coordinator)
     await event_listener.start()
 
-    # Create device entries for each target
+    # Create device entries for each target and remove stale ones
     device_registry = dr.async_get(hass)
+    current_identifiers: set[tuple[str, str]] = set()
     if coordinator.data and "targets" in coordinator.data:
         for target_id, target_data in coordinator.data["targets"].items():
             info = target_data["info"]
@@ -76,6 +77,15 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
                 model=model,
                 configuration_url=server_url,
             )
+            current_identifiers.add((DOMAIN, target_id))
+
+    # Remove devices for targets that no longer exist
+    for device_entry in dr.async_entries_for_config_entry(
+        device_registry, entry.entry_id
+    ):
+        if not device_entry.identifiers & current_identifiers:
+            _LOGGER.info("Removing stale device: %s", device_entry.name)
+            device_registry.async_remove_device(device_entry.id)
 
     # Store data
     hass.data.setdefault(DOMAIN, {})