fix: UI refinements for NowPlayingBar and QualityBadge

- Artwork preview only triggers on hover over artwork, not entire song-card
- Double song-card min-width (320px → 640px, max 700px)
- Reduce all control icons by 2px (18→16, 20→18, 22→20)
- Reduce control button sizes (32→30px, play 36→34px)
- QualityBadge: reduce text 1pt (9→8px, 10→9px), alpha 90%

static/cd-music.svg

@@ -0,0 +1,14 @@
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+<g clip-path="url(#clip0_429_11112)">
+<circle cx="12" cy="12" r="2" stroke="#292929" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"/>
+<circle cx="18" cy="9" r="2" stroke="#292929" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"/>
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+<defs>
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+<rect width="24" height="24" fill="white"/>
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+</svg>