Fix trigger to use event-based state monitoring

Replaces unsupported domain/device_class trigger with event-based approach that listens to state_changed events and filters for selected occupancy sensors.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

occupancy_controlled_lights.yaml

@@ -80,13 +80,16 @@ variables:
     {% endif %}
 
 trigger:
-  - trigger: state
+  - platform: event
+    event_type: state_changed
+    event_data:
       domain: binary_sensor
-    device_class: occupancy
 
 condition:
   - condition: template
-    value_template: "{{ trigger.entity_id in sensors }}"
+    value_template: "{{ trigger.event.data.entity_id in sensors }}"
+  - condition: template
+    value_template: "{{ state_attr(trigger.event.data.entity_id, 'device_class') == 'occupancy' }}"
 
 action:
   - choose: