feat: add double down feature to blackjack game

frontend/src/app/feature/game/blackjack/blackjack.component.ts

@@ -60,10 +60,13 @@ export default class BlackjackComponent {
     this.gameInProgress.set(game.state === 'IN_PROGRESS');
     this.gameState.set(game.state);
 
+    // When game ends, make sure all dealer cards are visible
+    const isGameOver = game.state !== 'IN_PROGRESS';
+    
     this.dealerCards.set(
       game.dealerCards.map((card, index) => ({
         ...card,
-        hidden: index === 1 && game.state === 'IN_PROGRESS',
+        hidden: !isGameOver && index === 1 && game.state === 'IN_PROGRESS',
       }))
     );
 
@@ -74,11 +77,14 @@ export default class BlackjackComponent {
       }))
     );
 
-    if (game.state !== 'IN_PROGRESS') {
+    // Only refresh and show game result if the game has ended
+    if (isGameOver) {
+      console.log('Game is over, state:', game.state);
       this.refreshUserBalance();
-      setTimeout(() => {
-        this.showGameResult.set(true);
-      }, 1000);
+      
+      // Show result immediately without resetting first
+      this.showGameResult.set(true);
+      console.log('Game result dialog should be shown now');
     }
   }
 
@@ -127,7 +133,26 @@ export default class BlackjackComponent {
     });
   }
 
+  onDoubleDown(): void {
+    if (!this.currentGameId()) return;
+    
+    if (this.gameState() !== 'IN_PROGRESS' || this.playerCards().length !== 2) {
+      return;
+    }
+
+    this.blackjackService.doubleDown(this.currentGameId()!).subscribe({
+      next: (game) => {
+        this.updateGameState(game);
+      },
+      error: (error) => {
+        console.error('Failed to double down:', error);
+        this.handleGameError(error);
+      },
+    });
+  }
+
   onCloseGameResult(): void {
+    console.log('Closing game result dialog');
     this.showGameResult.set(false);
   }