Improve the UX and UI when building the meta data from data sources (such as .json files in archives)

[nayumiDEV]

Just like Koromo Plugin ~~
https://github.com/Difegue/LANraragi/blob/dev/lib/LANraragi/Plugin/Metadata/Koromo.pm

[CrescentKohana]

This is already partially supported, but UI needs more work for sure though as it's currently only one button without any indication when the scanning is even completed 😅.