Improve motion review and add motion search (#22253)

* implement motion search and motion previews

* tweaks

* fix merge issue

* fix copilot instructions

frigate/app.py

@@ -51,6 +51,7 @@ from frigate.embeddings import EmbeddingProcess, EmbeddingsContext
 from frigate.events.audio import AudioProcessor
 from frigate.events.cleanup import EventCleanup
 from frigate.events.maintainer import EventProcessor
+from frigate.jobs.motion_search import stop_all_motion_search_jobs
 from frigate.log import _stop_logging
 from frigate.models import (
     Event,
@@ -599,6 +600,9 @@ class FrigateApp:
         # used by the docker healthcheck
         Path("/dev/shm/.frigate-is-stopping").touch()
 
+        # Cancel any running motion search jobs before setting stop_event
+        stop_all_motion_search_jobs()
+
         self.stop_event.set()
 
         # set an end_time on entries without an end_time before exiting