Add winner display name support in game metadata

Updated backend to include winner's display name in the game metadata API and frontend to display it alongside the email. This enhances clarity by showing a more user-friendly identifier.

backend/app/routes/games.py

@@ -123,9 +123,13 @@ def get_game_meta(req: Request, game_id: str, db: Session = Depends(get_db)):
     g = require_game_member(db, game_id, uid)
 
     winner_email = None
+    winner_display_name = None
+
     if g.winner_user_id:
         wu = db.query(User).filter(User.id == g.winner_user_id).first()
-        winner_email = wu.email if wu else None
+        if wu:
+            winner_email = wu.email
+            winner_display_name = wu.display_name
 
     return {
         "id": g.id,
@@ -134,6 +138,7 @@ def get_game_meta(req: Request, game_id: str, db: Session = Depends(get_db)):
         "host_user_id": g.host_user_id,
         "winner_user_id": g.winner_user_id,
         "winner_email": winner_email,
+        "winner_display_name": winner_display_name,
     }
 
 
@@ -150,7 +155,7 @@ def list_members(req: Request, game_id: str, db: Session = Depends(get_db)):
         .order_by(User.email.asc())
         .all()
     )
-    return [{"id": u.id, "email": u.email} for u in members]
+    return [{"id": u.id, "email": u.email, "display_name": u.display_name} for u in members]
 
 
 @router.patch("/{game_id}/winner")