Fix false manual override detection and brightness threshold guard in Motion Light

- Add configurable grace period (default 10s) to prevent false manual
  override detection from delayed device state reports (e.g., Zigbee)
- Fix any_device_on guard to respect brightness_threshold so lights
  below the threshold don't block the automation from triggering

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

manifest.json

@@ -1,3 +1,3 @@
 {
-  "version": "2.0.0"
+  "version": "2.2.3"
 }