feat: send from contact details

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

@@ -547,9 +547,20 @@ fun WalletScreen(
                     )
                     ContactDetailScreen(
                         viewModel = detailVm,
-                        onBack    = { navController.popBackStack() }
+                        onBack = { navController.popBackStack() },
+                        onPayAddress = { address ->
+                            vm.prefillSend(address)
+                            navController.navigate(TabItem.Send.route) {
+                                popUpTo(navController.graph.findStartDestination().id) {
+                                    saveState = true
+                                }
+                                launchSingleTop = true
+                                restoreState = false  // don't restore stale SendScreen state
+                            }
+                        }
                     )
                 }
+
             }
 
             // ── Clipboard banner — floats over content, slides in from top ────

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

@@ -23,6 +23,7 @@ import com.bitcointxoko.gudariwallet.ui.receive.ReceiveViewModel
 import com.bitcointxoko.gudariwallet.ui.send.SendEvent
 import com.bitcointxoko.gudariwallet.ui.send.SendStrings
 import com.bitcointxoko.gudariwallet.ui.send.SendViewModel
+import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
@@ -116,6 +117,16 @@ class WalletViewModel(
 
     val sendEvents: SharedFlow<SendEvent> = sendVm.events
 
+    // ── Contact tap-to-pay prefill ────────────────────────────────────────────
+    private val _pendingSend = MutableStateFlow<String?>(null)
+    val pendingSend: StateFlow<String?> get() = _pendingSend
+
+    /** Called by ContactDetailScreen before navigating to the Send tab. */
+    fun prefillSend(address: String) { _pendingSend.value = address }
+
+    /** Called by SendScreen once it has consumed the prefilled address. */
+    fun consumePendingSend() { _pendingSend.value = null }
+
     fun handleWithdrawScanned(raw: LnurlScanResponse, lnurl: String) {
         receiveVm.handleWithdrawResponse(raw, lnurl)
     }

app/src/main/java/com/bitcointxoko/gudariwallet/ui/contacts/ContactDetailScreen.kt

@@ -1,6 +1,7 @@
 package com.bitcointxoko.gudariwallet.ui.contacts
 
 import androidx.compose.foundation.BorderStroke
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
@@ -37,7 +38,8 @@ import com.bitcointxoko.gudariwallet.ui.common.DetailSection
 @Composable
 fun ContactDetailScreen(
     viewModel: ContactDetailViewModel,
-    onBack: () -> Unit
+    onBack: () -> Unit,
+    onPayAddress: (address: String) -> Unit = {}
 ) {
     val strings = LocalAppStrings.current
     val uiState by viewModel.uiState.collectAsStateWithLifecycle()
@@ -127,6 +129,7 @@ fun ContactDetailScreen(
                     isEditing = isEditing,
                     onRemoveAddress = { addressId -> pendingAddressDelete = addressId },
                     onSetDefault = { viewModel.setDefaultAddress(it) },
+                    onPayAddress = onPayAddress,
                     onEditAlias = { viewModel.openEditAliasSheet() },
                     onDeleteContact = { viewModel.requestDelete() },
                     modifier = Modifier.padding(innerPadding)
@@ -209,6 +212,7 @@ private fun ContactDetailContent(
     isEditing: Boolean,
     onRemoveAddress: (addressId: String) -> Unit,
     onSetDefault: (PaymentAddressEntity) -> Unit,
+    onPayAddress: (address: String) -> Unit,
     onEditAlias: () -> Unit,
     onDeleteContact: () -> Unit,
     modifier: Modifier = Modifier
@@ -276,6 +280,7 @@ private fun ContactDetailContent(
                             AddressRow(
                                 address = addr,
                                 isEditing = isEditing,
+                                onPay = { onPayAddress(addr.address) },
                                 onRemove = { onRemoveAddress(addr.id) },
                                 onSetDefault = { onSetDefault(addr) }
                             )
@@ -349,6 +354,7 @@ private fun ContactDetailContent(
 private fun AddressRow(
     address: PaymentAddressEntity,
     isEditing: Boolean,
+    onPay: () -> Unit,
     onRemove: () -> Unit,
     onSetDefault: () -> Unit,
 ) {
@@ -365,6 +371,10 @@ private fun AddressRow(
     Row(
         modifier = Modifier
             .fillMaxWidth()
+            .clickable(
+                enabled = !isEditing,
+                onClickLabel = "Pay with this address"
+            ) { onPay() }
             .padding(vertical = 12.dp),
         verticalAlignment = Alignment.CenterVertically
     ) {

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

@@ -59,6 +59,17 @@ fun SendScreen(
     }
     val fiatCurrency  = (balanceState as? BalanceState.Success)?.fiatCurrency
 
+    // ── Consume address prefilled from Contacts tap-to-pay ───────────────────
+    val pendingSend by vm.pendingSend.collectAsStateWithLifecycle()
+    LaunchedEffect(pendingSend) {
+        val address = pendingSend
+        if (!address.isNullOrBlank() && sendState is SendState.Idle) {
+            input = SendInputDetector.normalize(address)
+            vm.scan(address, sendStrings)
+            vm.consumePendingSend()
+        }
+    }
+
     // ── Collect NFC offer at top level — never inside a conditional ───────────
     val nfcOffer by nfcVm.nfcOfferState.collectAsStateWithLifecycle()