[Feature Request] Whitelist all library button

[novvux]

I absolutely love this app's design, but it misses one button.

Is your feature request related to a problem? Please describe.

I like to listen music. I have 99 artists on my phone and about 12k tracks from different folders. Aside from library's screen is lagging as hell do I really need to click on every folder to add it? Also there is no search field so I could easily find needed folders.

Describe the solution you'd like

Add button to whitelist all folders/scan all subfolders in selected folder

Describe alternatives you've considered

Click + button on every folder.

Additional context

And library optimisations for big collections, please. Phocid (https://github.com/tjysunset/phocid) handles my files about fine.