feat: redesign NowPlayingBar (88px) and update QualityBadge opacity

- Redesign NowPlayingBar with new layout: seekbar at top, controls/song card/volume below
- Increase NowPlayingBar height from 80px to 88px
- Update all height calculations to match (Sidebar, LyricsSidebar, main-content)
- Set QualityBadge text opacity to 85%
- Add static icons for quality badges (cd.svg, mp3.svg, logo-hires.png)

static/mp3.svg

@@ -0,0 +1,2 @@
+<?xml version="1.0" standalone="no"?>
+<svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" fill="#000000" width="128" height="128" viewBox="0 0 32 32" id="icon"><defs><style>.cls-1{fill:none;}</style></defs><title>MP3</title><path d="M28,9H22v2h6v4H24v2h4v4H22v2h6a2,2,0,0,0,2-2V11A2,2,0,0,0,28,9Z"/><path d="M14,23H12V9h6a2,2,0,0,1,2,2v5a2,2,0,0,1-2,2H14Zm0-7h4V11H14Z"/><polygon points="8 9 6.49 14 6 15.98 5.54 14 4 9 2 9 2 23 4 23 4 15 3.84 13 4.42 15 6 19.63 7.58 15 8.16 13 8 15 8 23 10 23 10 9 8 9"/><rect id="_Transparent_Rectangle_" data-name="&lt;Transparent Rectangle&gt;" class="cls-1" width="32" height="32"/></svg>