qml: restore Send/ScanDialog for desktop/dev, keeping qr scan Activity for android only.

Also use stable R package, regardless of APP_PACKAGE_DOMAIN used in build.

electrum/gui/qml/components/SendDialog.qml

@@ -0,0 +1,83 @@
+import QtQuick
+import QtQuick.Controls
+import QtQuick.Layouts
+import QtQuick.Controls.Material
+
+import org.electrum 1.0
+
+import "controls"
+
+// currently not used on android, kept for future use when qt6 camera stops crashing
+ElDialog {
+    id: dialog
+
+    property InvoiceParser invoiceParser
+
+    signal txFound(data: string)
+    signal channelBackupFound(data: string)
+
+    header: null
+    padding: 0
+    topPadding: 0
+
+    onAboutToHide: {
+        console.log('about to hide')
+        qrscan.stop()
+    }
+
+    function restart() {
+        qrscan.restart()
+    }
+
+    function dispatch(data) {
+        data = data.trim()
+        if (bitcoin.isRawTx(data)) {
+            txFound(data)
+        } else if (Daemon.currentWallet.isValidChannelBackup(data)) {
+            channelBackupFound(data)
+        } else {
+            invoiceParser.recipient = data
+        }
+    }
+
+    // override
+    function doClose() {
+        console.log('SendDialog doClose override') // doesn't trigger when going back??
+        qrscan.stop()
+        Qt.callLater(doReject)
+    }
+
+    ColumnLayout {
+        anchors.fill: parent
+        spacing: 0
+
+        QRScan {
+            id: qrscan
+            Layout.fillWidth: true
+            Layout.fillHeight: true
+
+            hint: qsTr('Scan an Invoice, an Address, an LNURL-pay, a PSBT or a Channel backup')
+            onFound: dialog.dispatch(scanData)
+        }
+
+        ButtonContainer {
+            Layout.fillWidth: true
+
+            FlatButton {
+                Layout.fillWidth: true
+                Layout.preferredWidth: 1
+                icon.source: '../../icons/copy_bw.png'
+                text: qsTr('Paste')
+                onClicked: {
+                    qrscan.stop()
+                    dialog.dispatch(AppController.clipboardToText())
+                }
+            }
+        }
+
+    }
+
+    Bitcoin {
+        id: bitcoin
+    }
+}