fix: show fiat conversion on paymentsent

app/src/main/java/com/bitcointxoko/gudariwallet/ui/SendScreen.kt

@@ -25,6 +25,8 @@ import com.bitcointxoko.gudariwallet.ui.send.LnurlInvoiceConfirmCard
 import com.bitcointxoko.gudariwallet.ui.send.LnurlPayForm
 import com.bitcointxoko.gudariwallet.util.SendInputDetector
 import com.bitcointxoko.gudariwallet.util.feePpm
+import com.bitcointxoko.gudariwallet.util.formatFiat
+import com.bitcointxoko.gudariwallet.util.satsToFiat
 import kotlinx.coroutines.launch
 
 @Composable
@@ -35,11 +37,11 @@ fun SendScreen(vm: WalletViewModel) {
     val activity = context as FragmentActivity
     val clipboard = LocalClipboard.current
     val scope     = rememberCoroutineScope()
-
-    // Read rate directly from VM cache — same source HomeTab uses.
-    // Both are null when no currency is selected; fiat display is suppressed.
-    val fiatRate     = vm.fiatRate       // Double?
-    val fiatCurrency = vm.fiatCurrency   // String?
+    val balanceState by vm.balanceState.collectAsStateWithLifecycle()
+    val fiatRate     = (balanceState as? BalanceState.Success)?.let { s ->
+        s.fiatAmount?.let { if (s.sats > 0) s.sats.toDouble() / it else null }
+    }
+    val fiatCurrency = (balanceState as? BalanceState.Success)?.fiatCurrency
 
     DisposableEffect(Unit) { onDispose { vm.resetSendState() } }
 
@@ -169,7 +171,16 @@ fun SendScreen(vm: WalletViewModel) {
                     text  = "${state.amountSats} sats",
                     color = MaterialTheme.colorScheme.onSurfaceVariant
                 )
-
+                val fiatAmount = if (fiatRate != null && fiatCurrency != null) {
+                    satsToFiat(state.amountSats, fiatRate)
+                } else null
+                if (fiatAmount != null && fiatCurrency != null) {
+                    Text(
+                        text  = "≈ ${formatFiat(fiatAmount, fiatCurrency)}",
+                        style = MaterialTheme.typography.bodyMedium,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                    )
+                }
                 Spacer(Modifier.height(4.dp))
                 val feeText = when {
                     state.feeSats == null || state.feeSats == 0L -> "No fees"