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/src/components/Player.tsx

@@ -167,15 +167,6 @@ export default function Player({ clip, isPlaying, onTogglePlay, onStop, onClose
 
   return (
     <>
-      <style>{`
-        @keyframes marquee-scroll {
-          0% { transform: translateX(0); }
-          100% { transform: translateX(-50%); }
-        }
-        .animate-marquee {
-          animation: marquee-scroll linear infinite;
-        }
-      `}</style>
       <div className="fixed bottom-0 left-0 right-0 bg-lyria-panel border-t border-white/10 px-4 py-3 z-40">
         <div className="max-w-6xl mx-auto flex items-center gap-3">
           {/* Play/Pause */}

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: [],