[Feature] View sprites in scene tagger

[Flashy78]

The scene tagger is also a very convenient place to add tags to videos without having to click through them one by one, go to edit and add tags.
There was recently a discussion on discord of a user who would hack the scene tagger by using it with the Auto Tag source, and just using it for quickly adding tags.

Quickly being able to see the sprite file generated for the video can help find lots of tags without having to watch the video, while providing more detail than just the preview video.

Add an icon to the scene tagger to show the sprite file in a lightbox, if the file has been generated.