fix(SendModal): hide the Custom network mode in `production`

- manage the lifetime of the Custom tab button dynamically; setting the
tab button to `visible: false` doesn't unfortunately remove it from the
tab bar

Fixes #16052

storybook/pages/SendModalPage.qml

@@ -210,6 +210,7 @@ SplitView {
                 preSelectedSendType: loader.preSelectedSendType
                 preSelectedHoldingID: loader.preSelectedHoldingID
                 preSelectedHoldingType: loader.preSelectedHoldingType
+                showCustomRoutingMode: ctrlShowCustomMode.checked
             }
             Component.onCompleted: loader.active = true
         }
@@ -222,7 +223,7 @@ SplitView {
 
         ColumnLayout {
             width: parent.width
-            spacing: 20
+            spacing: 10
 
             ColumnLayout {
                 spacing: 0
@@ -346,6 +347,12 @@ SplitView {
                 }
             }
 
+            CheckBox {
+                id: ctrlShowCustomMode
+                text: "Show custom network routing panel"
+                checked: true
+            }
+
             CheckBox {
                 id: showCommunityAssetsCheckBox
                 text: "Show community assets when sending tokens"

ui/app/mainui/AppMain.qml

@@ -1,10 +1,10 @@
 import QtQuick 2.15
-import QtQuick.Controls 2.13
-import QtQuick.Layouts 1.13
-import QtMultimedia 5.13
+import QtQuick.Controls 2.15
+import QtQuick.Layouts 1.15
+import QtMultimedia 5.15
 import Qt.labs.platform 1.1
 import Qt.labs.settings 1.1
-import QtQml.Models 2.14
+import QtQml.Models 2.15
 import QtQml 2.15
 
 import AppLayouts.Wallet 1.0
@@ -1595,6 +1595,8 @@ Item {
                 store: appMain.transactionStore
                 collectiblesStore: appMain.walletCollectiblesStore
 
+                showCustomRoutingMode: !production
+
                 onClosed: {
                     sendModal.closed()
                     sendModal.preSelectedSendType = Constants.SendType.Unknown

ui/imports/shared/popups/send/SendModal.qml

@@ -58,6 +58,7 @@ StatusDialog {
     property var bestRoutes
     property bool isLoading: false
     property int loginType
+    property bool showCustomRoutingMode
 
     property MessageDialog sendingError: MessageDialog {
         id: sendingError
@@ -657,6 +658,7 @@ StatusDialog {
                 totalFeesInFiat: d.totalFeesInFiat
                 fromNetworksList: fromNetworksRouteModel
                 toNetworksList: toNetworksRouteModel
+                showCustomRoutingMode: popup.showCustomRoutingMode
 
                 routerError: d.routerError
                 routerErrorDetails: d.routerErrorDetails

ui/imports/shared/popups/send/views/NetworkSelector.qml

@@ -36,6 +36,7 @@ Item {
     property int errorType: Constants.NoError
     property var bestRoutes
     property double totalFeesInFiat
+    property bool showCustomRoutingMode
 
     property string routerError: ""
     property string routerErrorDetails: ""
@@ -46,6 +47,9 @@ Item {
 
     QtObject {
         id: d
+
+        property var customButton
+
         readonly property int backgroundRectRadius: 13
         readonly property color backgroundRectColor: Theme.palette.indirectColor1
     }
@@ -62,9 +66,24 @@ Item {
             text: qsTr("Advanced")
             showBetaTag: true
         }
+    }
+
+    // not visible in `production` for now, see https://github.com/status-im/status-desktop/issues/16052
+    Component {
+        id: customButtonComponent
         StatusSwitchTabButton {
             text: qsTr("Custom")
-            enabled: false
+        }
+    }
+
+    onShowCustomRoutingModeChanged: {
+        if (root.showCustomRoutingMode) {
+            if (!!d.customButton)
+                d.customButton.destroy()
+            d.customButton = customButtonComponent.createObject(tabBar)
+            tabBar.addItem(d.customButton)
+        } else if (!!d.customButton) {
+            d.customButton.destroy()
         }
     }