See Library scan status in frontend

[Serph91P]

Feature description

For the most time using it it somehow stopped after it scaned my series folder. Then I was about to write a bug report because it would not find an of my movies. Even rebooted the docker stack. After a night has passed, I let it running. I t startet to show more, so I checked the log again and suddenly a whole lot of errors matching stuff and so one appeared. So I checked the frontned again and saw that Some movies appeared.

So far like the app but this is kinda bad for me to not be able to know what is going on. A simple "Scann in Progress" or something would be great. If you want it fancy show some kind of progress bar how far it has preoceeded or something.

Continue the great work :)