Add HAOS scene preset buttons and smooth tutorial scrolling

Expose scene presets as button entities in the HA integration under a
dedicated "Scenes" device. Each button activates its scene via the API.
The coordinator now fetches scene presets alongside other data, and the
integration reloads when the scene list changes.

Also animate tutorial autoscroll with smooth behavior and wait for
scrollend before positioning the spotlight overlay.

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

custom_components/wled_screen_controller/__init__.py

@@ -28,6 +28,7 @@ from .ws_manager import KeyColorsWebSocketManager
 _LOGGER = logging.getLogger(__name__)
 
 PLATFORMS: list[Platform] = [
+    Platform.BUTTON,
     Platform.SWITCH,
     Platform.SENSOR,
     Platform.NUMBER,
@@ -79,6 +80,20 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
             )
             current_identifiers.add((DOMAIN, target_id))
 
+    # Create a single "Scenes" device for scene preset buttons
+    scenes_identifier = (DOMAIN, f"{entry.entry_id}_scenes")
+    scene_presets = coordinator.data.get("scene_presets", []) if coordinator.data else []
+    if scene_presets:
+        device_registry.async_get_or_create(
+            config_entry_id=entry.entry_id,
+            identifiers={scenes_identifier},
+            name=f"{server_name} Scenes",
+            manufacturer=server_name,
+            model="Scene Presets",
+            configuration_url=server_url,
+        )
+    current_identifiers.add(scenes_identifier)
+
     # Remove devices for targets that no longer exist
     for device_entry in dr.async_entries_for_config_entry(
         device_registry, entry.entry_id
@@ -95,10 +110,13 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
         DATA_EVENT_LISTENER: event_listener,
     }
 
-    # Track target IDs to detect changes
+    # Track target and scene IDs to detect changes
     initial_target_ids = set(
         coordinator.data.get("targets", {}).keys() if coordinator.data else []
     )
+    initial_scene_ids = set(
+        p["id"] for p in (coordinator.data.get("scene_presets", []) if coordinator.data else [])
+    )
 
     def _on_coordinator_update() -> None:
         """Manage WS connections and detect target list changes."""
@@ -117,10 +135,13 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
                 else:
                     hass.async_create_task(ws_manager.stop_listening(target_id))
 
-        # Reload if target list changed
+        # Reload if target or scene list changed
         current_ids = set(targets.keys())
-        if current_ids != initial_target_ids:
-            _LOGGER.info("Target list changed, reloading integration")
+        current_scene_ids = set(
+            p["id"] for p in coordinator.data.get("scene_presets", [])
+        )
+        if current_ids != initial_target_ids or current_scene_ids != initial_scene_ids:
+            _LOGGER.info("Target or scene list changed, reloading integration")
             hass.async_create_task(
                 hass.config_entries.async_reload(entry.entry_id)
             )