[Feature] Add sleep/wake timer to slideshow

I have searched the existing feature requests, both open and closed, to make sure this is not a duplicate request. • Yes The feature Hi, I don't know if this has been asked before, but I have a feature request for the slideshow on Android. I made a custom photo frame using an older tablet and I run Immich on it most of the day. The only annoying thing is that I have to manually lock the tablet every evening, because there's no point in keeping the screen on all night. Would it be possible to add some kind of sleep/wake timer to the slideshow? For example, when starting the slideshow you could set it to go to sleep at 23:00 and start again at 07:00. I don't know if Immich can actually turn the screen off and back on, but even just showing a black screen during those hours and automatically continuing the slideshow afterwards would be enough for me. One other thing I noticed is that when I leave the slideshow open in the Android app for a longer ti…