User should be able to close player while loading

[kylepolich]

The "X" button should not be disabled ever.

Can we move away from this design entirely? It looks awkward. If the file cannot be played, let's have the Play button be disabled and have a spinner inside it, but the entire bar does not need to be disabled, especially when other elements like the title can be known immediately.

[hlib-lozhkovyi]

Following your needs, updated the loading animation: removed loading bar and disabled volume/track sliders, spinner in play button

[kylepolich]

Looking really good! Great improvements!!! I will wait for PR to be ready and then deploy.