fix: restore glassmorphism card effects on new components

Apply global .card class to Dashboard, Profile, ConfettiReveal, and
Toast components for consistent glossy card appearance.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/components/ConfettiReveal.tsx

@@ -25,7 +25,7 @@ export default function ConfettiReveal({ match, onDismiss }: Props) {
 
   return (
     <div className={styles.overlay} onClick={onDismiss}>
-      <div className={styles.card} onClick={e => e.stopPropagation()}>
+      <div className={`card ${styles.card}`} onClick={e => e.stopPropagation()}>
         <div className={styles.result}>
           {match.homeTeam.shortName} {match.score.home}:{match.score.away} {match.awayTeam.shortName}
         </div>