refactor: resize and reposition mini bingo card background

- Reduce mini card dimensions from 125x125 to 90x90 pixels
- Adjust positioning coordinates from (px+54.5, py+34.5) to (px+28, py+8)
- Improves visual alignment and spacing of opponent's bingo card in the UI

public/src/games/bingo/BingoGame.js

@@ -309,8 +309,8 @@ export default class BingoGame extends Phaser.Scene {
       this.add.rectangle(px, py, PW, PH, 0x000000, 0.6).setStrokeStyle(1, 0x8a7050).setDepth(D.panel);
 
       // Cream white background behind the mini bingo card
-      const miniW = 125, miniH = 125;
-      this.add.rectangle(px + 54.5, py + 34.5, miniW, miniH, 0xe4e2b3, 0.95)
+      const miniW = 90, miniH = 90;
+      this.add.rectangle(px + 28, py + 8, miniW, miniH, 0xe4e2b3, 0.95)
         .setDepth(D.panel + 1);
 
       this.add.text(px, py - PH / 2 + 16, opp.name ?? `Player ${i + 1}`, {