feat: Implement leaderboard modal with player rankings

[portdeveloper]

Create a popup leaderboard showing top players and scores.

Technical Requirements:

• Implement modal container with:
  • Backdrop blur effect
  • Close button
• Display player rankings:
  • Position numbers
  • Player names
  • Scores
  • Highlight current player

Design Notes:

• Match main game's purple theme
• Ensure readable text contrast
• Mobile-friendly layout
• Proper spacing between entries

[aslanw3b]

Leaderboard

test it live; https://www.figma.com/proto/3rGiuOYd1jtnrLyNSGuYw9/Slot-Machine?node-id=3-692&t=Vpjd0pFq4RkyeNyP-1

[caginagirdemir]

Hi, I'd like to work on this issue. Could you assign it to me?