fix: get balance from websocket instead of separate api call

app/src/main/java/com/bitcointxoko/gudariwallet/api/Models.kt

@@ -259,6 +259,7 @@ data class PaymentDetailResponse(
 
 // ── WebSocket payment message ─────────────────────────────────────────────────
 data class WsPaymentMessage(
+    @SerializedName("wallet_balance") val walletBalance: Long?,
     val payment: WsPayment?
 )
 

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,

app/src/main/java/com/bitcointxoko/gudariwallet/ui/balance/BalanceViewModel.kt

@@ -25,7 +25,7 @@ class BalanceViewModel(
     val balanceState: StateFlow<BalanceState> = _balanceState
 
     // Emits after every successful balance refresh so other ViewModels
-    // (e.g. FiatViewModel) can react without polling.
+    // can react without polling.
     private val _balanceRefreshed = MutableSharedFlow<Long>(extraBufferCapacity = 1)
 
     // Emits incoming payment events so ReceiveViewModel can update its state.
@@ -117,25 +117,38 @@ class BalanceViewModel(
             WalletNotificationService.paymentEvents.collect { event ->
                 Log.d(TAG, "BALANCE [WS EVENT  ] ${if (event.isOutgoing) "SENT" else "RECEIVED"} ${event.amountSats} sats")
 
-                val current = _balanceState.value
-                if (current is BalanceState.Success) {
-                    val delta   = if (event.isOutgoing) -event.amountSats else event.amountSats
-                    val newSats = (current.sats + delta).coerceAtLeast(0L)
-                    Log.d(TAG, "BALANCE [WS DELTA  ] ${current.sats} ${if (delta >= 0) "+" else ""}$delta = $newSats sats (optimistic)")
-                    _balanceState.value = current.copy(sats = newSats, isRefreshing = true)
-                    persistBalance(newSats)
+                val newSats = if (event.walletBalance != null) {
+                    // Authoritative balance from the server — no delta math needed
+                    Log.d(TAG, "BALANCE [WS BALANCE] ${event.walletBalance} sats (from server)")
+                    event.walletBalance
                 } else {
-                    Log.w(TAG, "BALANCE [WS EVENT  ] Received event but balance state is ${current::class.simpleName} — skipping delta")
+                    // Fallback: server didn't send balance, apply delta optimistically
+                    val current = _balanceState.value
+                    if (current is BalanceState.Success) {
+                        val delta = if (event.isOutgoing) -event.amountSats else event.amountSats
+                        val sats  = (current.sats + delta).coerceAtLeast(0L)
+                        Log.d(TAG, "BALANCE [WS DELTA  ] ${current.sats} ${if (delta >= 0) "+" else ""}$delta = $sats sats (optimistic fallback)")
+                        sats
+                    } else null
                 }
 
-                refreshBalance()
+                if (newSats != null) {
+                    val now = System.currentTimeMillis()
+                    _balanceState.value = BalanceState.Success(
+                        sats         = newSats,
+                        isRefreshing = false,
+                        lastUpdated  = now
+                    )
+                    persistBalance(newSats)
+                    _balanceRefreshed.tryEmit(newSats)
+                    onBalanceRefreshed?.invoke()
+                }
+
+                // refreshBalance() call removed — balance is authoritative from WS
 
                 if (!event.isOutgoing) {
                     _incomingPayment.tryEmit(
-                        IncomingPaymentEvent(
-                            amountSats = event.amountSats,
-                            memo       = event.memo
-                        )
+                        IncomingPaymentEvent(amountSats = event.amountSats, memo = event.memo)
                     )
                 }
             }