[feat] Create "Add current track" button in playlist view

[will-hut]

I'm enjoying using Feishin as my music player for my library. I thought it would be nice to add a "Add current track" button to the playlist sidebar. That way, when a song is playing, I can quickly add it to as many playlists as I feel like it belongs in.

Currently, I have it hiding the button if the playlist has rules (ie, a smart playlist). You can add a song to a shared playlist, but if you don't have (admin) permission, it throws an error toast.

This also allows adding duplicates of a song to a playlist, so a toggle somewhere to disable duplicates could be a nice feature.

I'm not a React dev and haven't really contributed to open source, so if there's any issues please let me know! I think I did a decent job, but I'm always looking for ways to make my code better.

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Name	Status	Preview	Comments	Updated (UTC)
feishin	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 3, 2024 2:23am

[will-hut]

This adds a feature similar to what is mentioned in #556