GS_PH_VERSION command, per-printhead demo UI with --printheads CLI arg

Add getPhVersion(printheadId) to Xpl2Client with phVersionReceived signal
carrying all 8 response fields. Mock server echoes canned version data for
any requested printhead ID.

Demo app accepts --printheads N (default 10) to simulate N printheads.
The UI shows a scrollable per-PH list with individual and bulk version
query buttons, updating each row's version info on response.

1 files changed, 111 insertions, 21 deletions

diff --git a/demo/Main.qml b/demo/Main.qml
index db015e3..07e42b1 100644
--- a/demo/Main.qml
+++ b/demo/Main.qml
@@ -8,10 +8,26 @@ import Xpl2
 ApplicationWindow {
     id: root
 
-    height: 600
+    // Set from C++ via setInitialProperties (--printheads CLI arg, default 10).
+    required property int demoPhCount
+
+    height: 700
     title: "XPL2 Demo"
     visible: true
-    width: 800
+    width: 900
+
+    Component.onCompleted: {
+        for (let i = 1; i <= root.demoPhCount; ++i)
+        phModel.append({
+                           "phId": i,
+                           "versionInfo": ""
+                       });
+    }
+
+    ListModel {
+        id: phModel
+
+    }
 
     Connections {
         function onConnectedChanged() {
@@ -23,6 +39,28 @@ ApplicationWindow {
             debugConsole.appendLog("ERROR: " + error);
         }
 
+        function onPhVersionReceived(controllerId: int, printheadId: int,
+                                     mcuFirmwareVersion: string,
+                                     mcuHardwareVersion: string,
+                                     mcuFirmwareVariant: string,
+                                     fpgaFirmwareVersion: string,
+                                     fpgaHardwareVersion: string,
+                                     bootloaderVersion: string) {
+            for (let i = 0; i < phModel.count; ++i) {
+                if (phModel.get(i).phId === printheadId) {
+                    phModel.setProperty(i, "versionInfo",
+                                        "MCU %1/%2 (%3) | FPGA %4/%5 | Boot %6".arg(
+                                            mcuFirmwareVersion).arg(
+                                            mcuHardwareVersion).arg(
+                                            mcuFirmwareVariant).arg(
+                                            fpgaFirmwareVersion).arg(
+                                            fpgaHardwareVersion).arg(
+                                            bootloaderVersion));
+                    break;
+                }
+            }
+        }
+
         function onStatusMessage(message: string) {
             debugConsole.appendLog(message);
         }
@@ -74,38 +112,90 @@ ApplicationWindow {
                 }
             }
 
-            // --- Protocol Commands ---
+            // --- JC Version ---
             GroupBox {
                 Layout.fillWidth: true
                 enabled: Xpl2Client.connected
-                title: "Protocol Commands"
+                title: "Jetting Controller"
 
-                ColumnLayout {
+                RowLayout {
                     anchors.fill: parent
 
-                    RowLayout {
-                        Button {
-                            text: "Get JC Version"
+                    Button {
+                        text: "Get JC Version"
 
-                            onClicked: Xpl2Client.getJcVersion()
-                        }
+                        onClicked: Xpl2Client.getJcVersion()
+                    }
 
-                        Label {
-                            text: Xpl2Client.controllerId > 0
-                                  ? "Controller: %1 | FW: %2 | HW: %3 | PHs: %4".arg(
-                                        Xpl2Client.controllerId).arg(
-                                        Xpl2Client.firmwareVersion).arg(
-                                        Xpl2Client.hardwareVersion).arg(
-                                        Xpl2Client.printheadCount) :
-                                    "No version data"
-                        }
+                    Label {
+                        text: Xpl2Client.controllerId > 0
+                              ? "Controller: %1 | FW: %2 | HW: %3 | PHs: %4".arg(
+                                    Xpl2Client.controllerId).arg(
+                                    Xpl2Client.firmwareVersion).arg(
+                                    Xpl2Client.hardwareVersion).arg(
+                                    Xpl2Client.printheadCount) :
+                                "No version data"
                     }
                 }
             }
 
-            // --- Spacer ---
-            Item {
+            // --- Printheads ---
+            GroupBox {
                 Layout.fillHeight: true
+                Layout.fillWidth: true
+                enabled: Xpl2Client.connected
+                title: "Printheads (%1)".arg(root.demoPhCount)
+
+                ColumnLayout {
+                    anchors.fill: parent
+
+                    Button {
+                        text: "Get All PH Versions"
+
+                        onClicked: {
+                            for (let i = 0; i < phModel.count; ++i)
+                            Xpl2Client.getPhVersion(phModel.get(i).phId);
+                        }
+                    }
+
+                    ScrollView {
+                        Layout.fillHeight: true
+                        Layout.fillWidth: true
+
+                        ListView {
+                            model: phModel
+                            spacing: 4
+
+                            delegate: RowLayout {
+                                id: phDelegate
+
+                                required property int phId
+                                required property string versionInfo
+
+                                width: ListView.view.width
+
+                                Label {
+                                    Layout.preferredWidth: 50
+                                    font.bold: true
+                                    text: "PH %1".arg(phDelegate.phId)
+                                }
+
+                                Button {
+                                    text: "Version"
+
+                                    onClicked: Xpl2Client.getPhVersion(
+                                                   phDelegate.phId)
+                                }
+
+                                Label {
+                                    Layout.fillWidth: true
+                                    elide: Text.ElideRight
+                                    text: phDelegate.versionInfo || "—"
+                                }
+                            }
+                        }
+                    }
+                }
             }
         }