[Linux] Add Qr-Code to sync irk and enc key (#142)

linux/KeysQRDialog.qml

@@ -0,0 +1,69 @@
+import QtQuick 2.15
+import QtQuick.Controls 2.15
+import QtQuick.Layouts 1.15
+import QtQuick.Window 2.15
+
+Window {
+    id: root
+    title: "Magic Cloud Keys QR Code"
+    flags: Qt.Dialog
+    modality: Qt.WindowModal
+
+    // Use system palette for dynamic theming
+    SystemPalette { id: systemPalette }
+    color: systemPalette.window // Background adapts to theme
+
+    width: Math.min(Screen.width * 0.8, 300)
+    height: Math.min(Screen.height * 0.7, 350)
+
+    property string irk: ""
+    property string encKey: ""
+
+    ColumnLayout {
+        anchors.fill: parent
+        anchors.margins: 20
+        spacing: 20
+
+        // QR Code Container
+        Rectangle {
+            id: qrContainer
+            Layout.fillWidth: true
+            Layout.fillHeight: true
+            Layout.minimumHeight: width
+            radius: 4
+            color: systemPalette.base
+            border.color: systemPalette.mid
+
+            Image {
+                id: qrCodeImage
+                anchors.centerIn: parent
+                width: Math.min(parent.width * 0.9, parent.height * 0.9)
+                height: width
+                fillMode: Image.PreserveAspectFit
+                source: "image://qrcode/" + root.encKey + ";" + root.irk
+
+                BusyIndicator {
+                    anchors.centerIn: parent
+                    running: qrCodeImage.status === Image.Loading
+                }
+
+                Label {
+                    anchors.centerIn: parent
+                    visible: qrCodeImage.status === Image.Error
+                    text: "Failed to generate QR code"
+                    color: systemPalette.text // Dynamic text color
+                }
+            }
+        }
+
+        // Instruction text
+        Label {
+            Layout.fillWidth: true
+            text: "Scan this QR code to transfer\nthe Magic Cloud Keys to another device"
+            horizontalAlignment: Text.AlignHCenter
+            wrapMode: Text.WordWrap
+            color: systemPalette.text // Adapts to dark/light mode
+            font.pixelSize: 14
+        }
+    }
+}