Fix email display logic in WinnerBadge component

Replaced the conditional display of the winner's email with a more robust logic to show either the trimmed display name or the email. This ensures better handling of cases where the display name is unavailable or matches the email.

frontend/src/components/WinnerBadge.jsx

@@ -22,6 +22,8 @@ export default function WinnerBadge({ winner, winnerEmail }) {
     (winner?.display_name || "").trim() &&
     winner.email.trim().toLowerCase() !== winner.display_name.trim().toLowerCase();
 
+  const displayName = me ? ((me.display_name || "").trim() || me.email) : "";
+
   return (
     <div
       style={{
@@ -49,7 +51,7 @@ export default function WinnerBadge({ winner, winnerEmail }) {
 
           {showEmail && (
             <div style={{ fontSize: 12, opacity: 0.8, color: stylesTokens.textDim }}>
-              {winner.email}
+              {displayName}
             </div>
           )}
         </div>