Manage Account & Manage Track Modal is cut off on vertically small screens

[peterklingelhofer]

You can get to it by expanding the screen or zooming out, but we should maybe make this modal scrollable so users don't have to resort to that.

Definitely need overflow-y: auto; in src/components/common/Modal.tsx and src/components/ManageArtist/AlbumForm.tsx, but have to handle height so that it's always higher than the bottom player bar.

The same is true for artists trying to manage a track at /manage