feat(ui): refactor global layout with immersive glassmorphism (Spotify/Discord-like)
- Palette: Discord-like deep cold grays (background 0.12, sidebar 0.09, card 0.16)
- Transitions: --duration-immersive 200ms ease-in-out for micro-interactions
- Sidebar: bg from var(--sidebar), rounded-xl, backdrop-blur-md; icons
text-muted-foreground/60 → text-primary on hover/active; 2px teal active bar
- Header: backdrop-blur-md, 200ms transitions
- MiniPlayer: h-20, backdrop-blur-md, bg-background/80, border-white/5 (no harsh border)
- Play button: teal pill with diffuse glow (shadow primary/0.4)
- Card: new 'surface' variant (border white/5, hover lighter + diffuse shadow)
Co-authored-by: Cursor <cursoragent@cursor.com>
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