fix: correct blackjack PnL calculation and enhance UI

- Fix incorrect PnL calculations where multipliers were treated as amounts
- Add proper net profit calculation: (multiplier × bet) - bet
- Update UI with gradient backgrounds, icons, and improved animations
- Add slide-in and pulse-slow keyframe animations
- Enhance dealer area with status-based styling
- Improve action buttons with colored gradients and hover effects
- Revise round result banner with better visual hierarchy

shared/games/blackjack/blackjack.plugin.ts

@@ -194,12 +194,14 @@ function finishPlayerTurns(state: BlackjackState): BlackjackState {
         // First resolve the hands
         const resolvedHands = seat.hands.map(h => resolveHand(h, dealerHand));
         
-        // Then calculate PnL based on resolved hands
+        // Calculate round payouts as multipliers
         const roundPayout = calculateRoundPayouts({ [id]: { ...seat, hands: resolvedHands } });
-        const roundPayoutMoney = roundPayout[id] ?? 0;
-        // Subtract the total bet amount to get net profit/loss
+        const multiplier = roundPayout[id] ?? 0;
+        // Calculate total bet amount for this player
         const roundBetTotal = seat.hands.reduce((sum, h) => sum + (h.bet * state.betAmount), 0);
-        const roundNetPnl = roundPayoutMoney ? roundPayoutMoney - roundBetTotal : -roundBetTotal;
+        // Calculate actual payout amount and net profit
+        const roundPayoutAmount = Math.round(multiplier * state.betAmount);
+        const roundNetPnl = roundBetTotal > 0 ? roundPayoutAmount - roundBetTotal : 0;
         
         resolvedSeats[id] = {
             ...seat,