Improve thumbnails and live player (#9828)

* Don't show gif until event is over and fix aspect

* Be more efficient about updating events

* ensure previews are sorted

* Don't show live view when window is not visible

* Move debug camera to separate view

* Improve jpg loading

* Ensure still is updated on player live finish

* Don't reload when window not visible

* Only disconnect instead of full remove

* Use start time instead of event over to determine gif

frigate/http.py

@@ -2294,9 +2294,9 @@ def preview_thumbnail(camera_name, frame_time):
     file_check = f"{file_start}-{frame_time}.jpg"
     selected_preview = None
 
-    for file in os.listdir(preview_dir):
+    for file in sorted(os.listdir(preview_dir)):
         if file.startswith(file_start):
-            if file < file_check:
+            if file > file_check:
                 selected_preview = file
                 break