Add Music Player UI for Mobile Devices

[anshg1214]

This PR adds a Music Player UI for Mobile Devices

[MonkeyDo]

Looks awesome already! Much, much better UI on mobile, and I think the desktop version is also going to be jealous :P

Early feedback based on this:

• I added a padding-bottom of the height of the brainzplayer bar (@brainzplayer-height + @progress-bar-height variables), otherwise the bottom buttons are all hidden behind it:
  
• You can't really read the track duration text; you might need a tool to decide which color is most readable, and we have tinycolor2 installed. You can generate complementary colors for example, and use this utility to automatically choose one with default to black/white if it's not readable: https://github.com/bgrins/TinyColor?tab=readme-ov-file#mostreadable I was just looking at that for LB-1102, LB-1610, LB-945: Revamp Top Entity stats pages #2937
• I think the top header might be a bit too tall; it looks quite roomy, and (it's hard to see) the cover art is cropped at the bottom, suggesting there is not enough space available (because of the bottom padding I added)
• Regarding the sizing of everything I would recommend the following:
  • Have a padding all around the player of 1em that will serve to align all the elements inside left and right
  • Remove the padding from .cover-art-scroll-wrapper and add the following to make sure the cover art stays at max dimensions: flex-shrink: 0; aspect-ratio: 1;
  • Remove horizontal padding for the other elements
  • Don't constrain the height of the .info and .header classes. Basically, we set a full size for the cover art and let the rest automatically take up the available space
• I think the cover-art-wrapper class doesn't need to be flexbox (or maybe you do for swiping??).
• The feedback icons stroke looks too thick next to the rest of the UI. stroke-width: 20px; (or maybe 1em) (down from 50px) should work:
  
• Finally, for .player-buttons you can remove the padding and the font-size, and set margin-top: auto; margin-bottom: auto; to automatically center it vertically in the available space. Each button inside can have the class .btn-icon added to have a larger button target for my fat fingers :P

The result is this, with flexbox highlighted for convenience

[MonkeyDo]

A few more little pieces of feedback as I've been testing on my phone.
The new player UI is looking sick !

[MonkeyDo]

I have been looking at how we can improve this color detection stuff, not for right now but more generally.
I found a nice library that will extract multiple prominent colors of an image rather than just the average color:
https://jariz.github.io/vibrant.js/ (deprecated, but see the repo below taking over)
https://github.com/Vibrant-Colors/node-vibrant

That will allow us to use multiple colors from the image for the background and the text and be closer to the look and feel of the image, and preventing "issues" like this one, where the color isn't quite right and the white text is barely legible:

Instead, it would be ideal if we could use the yellow from the image as background and the red color for text and maybe even the green for other elements of the UI.

Something for another day in any case, but could really improve the look

[MonkeyDo]

Looks like after I finish my queue, the player starts playing from the top despite the loop/repeat option being off

EDIT: Sorry I wrote this comment on the wrong PR ! :P

[MonkeyDo]

I will let you resolve the conflict if you don't mind, and I'm ready for finalizing the PR (sorry I took so long coming back to this!).
Will do extensive testing locally and deploy on test as well to get aerozol's feedback (and maybe wider community after that?)