fix: get balance from websocket instead of separate api call

app/src/main/java/com/bitcointxoko/gudariwallet/service/WalletNotificationService.kt

@@ -81,6 +81,7 @@ class WalletNotificationService : Service() {
      * Emitted to [paymentEvents] for in-process UI updates.
      */
     data class PaymentEvent(
+        val walletBalance: Long?,
         val amountSats: Long,
         val memo: String?,
         val isOutgoing: Boolean,
@@ -229,6 +230,7 @@ class WalletNotificationService : Service() {
         serviceScope.launch {
             _paymentEvents.emit(
                 PaymentEvent(
+                    walletBalance = msg.walletBalance,
                     amountSats = amountSats,
                     memo       = payment.memo,
                     isOutgoing = isOutgoing,
@@ -245,7 +247,7 @@ class WalletNotificationService : Service() {
                     checkingId = payment.checkingId,
                     paymentHash = payment.paymentHash,
                     amountMsat = payment.amount,
-                    feeMsat = 0L,           // WsPaymentMessage doesn't carry fee
+                    feeMsat = payment.fee,
                     memo = payment.memo,
                     time = payment.time,
                     status = payment.status,