fix: Register marquee animation in Tailwind config

The marquee scroll effect wasn't working because 'animate-marquee'
was defined as an inline CSS class, not a Tailwind utility. Tailwind's
JIT compiler strips unknown classes, so group-hover:animate-marquee
was being removed at build time.

Fix: Added 'marquee-scroll' keyframes and 'marquee' animation to
tailwind.config.js theme.extend. Now 'animate-marquee' is a proper
Tailwind utility that works with group-hover and responsive variants.

Also removed the inline <style> block from Player.tsx since the
animation is now handled by Tailwind.

frontend/tailwind.config.js

@@ -12,7 +12,16 @@ export default {
         'lyria-accent': '#ff6b35',
         'lyria-text': '#e0e0e0',
         'lyria-muted': '#6b6b7b',
-      }
+      },
+      keyframes: {
+        'marquee-scroll': {
+          '0%': { transform: 'translateX(0)' },
+          '100%': { transform: 'translateX(-50%)' },
+        },
+      },
+      animation: {
+        'marquee': 'marquee-scroll linear infinite',
+      },
     },
   },
   plugins: [],