Add "Enter" shortcut

[NeoCoderMatrix86]

Is your feature request related to a problem? Please describe.
Opening dialogs like "Download project" or "Download cuesheet" and entering a filename should open download when pressing "Enter".

Also during record adding a track should be able via "Enter".

[NeoCoderMatrix86]

Switch to mudblazors keyboard handler: https://mudblazor.com/components/hotkey