qml: add Technical properties header for TxDetails and LightningPaymentDetails

electrum/gui/qml/components/LightningPaymentDetails.qml

@@ -132,6 +132,11 @@ Pane {
                 }
             }
 
+            Heading {
+                Layout.columnSpan: 2
+                text: qsTr('Technical properties')
+            }
+
             Label {
                 Layout.columnSpan: 2
                 Layout.topMargin: constants.paddingSmall

electrum/gui/qml/components/TxDetails.qml

@@ -151,17 +151,6 @@ Pane {
                         text: txdetails.date
                     }
 
-                    Label {
-                        visible: txdetails.isMined
-                        text: qsTr('Mined at')
-                        color: Material.accentColor
-                    }
-
-                    Label {
-                        visible: txdetails.isMined
-                        text: txdetails.shortId
-                    }
-
                     Label {
                         Layout.columnSpan: 2
                         Layout.topMargin: constants.paddingSmall
@@ -224,6 +213,22 @@ Pane {
                         }
                     }
 
+                    Heading {
+                        Layout.columnSpan: 2
+                        text: qsTr('Technical properties')
+                    }
+
+                    Label {
+                        visible: txdetails.isMined
+                        text: qsTr('Mined at')
+                        color: Material.accentColor
+                    }
+
+                    Label {
+                        visible: txdetails.isMined
+                        text: txdetails.shortId
+                    }
+
                     Label {
                         Layout.columnSpan: 2
                         Layout.topMargin: constants.paddingSmall