Add task strip and Overview to navigation panel

In convergence mode, show a running-app icon strip in the navigation
panel using the existing TaskManager.TasksModel. Each icon activates
its window on click, with an indicator dot for the active window.

Replace the mobile task switcher button with a KWin Overview trigger:
add triggerOverview() to TaskPanel (D-Bus call to kglobalaccel), swap
the button icon to view-grid-symbolic, and enable the Overview effect
in the envmanager KWin config when convergence mode is active.

Wire convergenceMode and taskModel properties from
NavigationPanelComponent through to NavigationPanel so the task strip
populates from the existing TasksModel instance.

components/mobileshell/qml/navigationpanel/NavigationPanel.qml

@@ -9,6 +9,7 @@ import QtQuick
 import QtQuick.Layouts
 import QtQuick.Window
 import QtQuick.Effects
+import QtQuick.Controls as Controls
 
 import org.kde.kirigami as Kirigami
 import org.kde.taskmanager 0.1 as TaskManager
@@ -34,6 +35,10 @@ Item {
 
     property bool isVertical: false
 
+    // Convergence mode: show running-app task strip
+    property bool convergenceMode: false
+    property var taskModel: null
+
     // drop shadow for icons
     MultiEffect {
         anchors.fill: icons
@@ -133,6 +138,63 @@ Item {
                 }
             }
         }
+
+        // Running-app task strip for convergence (desktop) mode
+        ListView {
+            id: taskStrip
+            visible: root.convergenceMode && root.taskModel !== null && root.taskModel.count > 0
+            orientation: root.isVertical ? ListView.Vertical : ListView.Horizontal
+            spacing: Kirigami.Units.smallSpacing
+            clip: true
+            interactive: contentWidth > width
+            model: root.taskModel
+
+            delegate: NavigationPanelButton {
+                id: taskDelegate
+                required property int index
+                required property var model
+                width: taskStrip.orientation === ListView.Horizontal ? height : taskStrip.width
+                height: taskStrip.orientation === ListView.Horizontal ? taskStrip.height : taskStrip.width
+
+                Kirigami.Theme.colorSet: root.foregroundColorGroup
+                Kirigami.Theme.inherit: false
+                iconSource: taskDelegate.model.decoration
+                enabled: true
+                shrinkSize: 0
+
+                onClicked: {
+                    root.taskModel.requestActivate(root.taskModel.makeModelIndex(taskDelegate.index));
+                }
+
+                // Right-click context menu
+                MouseArea {
+                    anchors.fill: parent
+                    acceptedButtons: Qt.RightButton
+                    onClicked: taskContextMenu.popup()
+                }
+
+                Controls.Menu {
+                    id: taskContextMenu
+                    Controls.MenuItem {
+                        text: i18n("Close")
+                        icon.name: "window-close"
+                        onTriggered: root.taskModel.requestClose(root.taskModel.makeModelIndex(taskDelegate.index))
+                    }
+                }
+
+                // Active-window indicator dot
+                Rectangle {
+                    anchors.bottom: parent.bottom
+                    anchors.horizontalCenter: parent.horizontalCenter
+                    anchors.bottomMargin: Kirigami.Units.smallSpacing / 2
+                    width: Kirigami.Units.smallSpacing * 2
+                    height: width
+                    radius: width / 2
+                    color: Kirigami.Theme.highlightColor
+                    visible: taskDelegate.model.IsActive === true
+                }
+            }
+        }
     }
 
     states: [
@@ -200,6 +262,21 @@ Item {
                 height: Kirigami.Units.gridUnit * 2
                 width: icons.width
             }
+            // Task strip: vertical layout — positioned between leftCornerButton (bottom) and leftButton (above middle)
+            AnchorChanges {
+                target: taskStrip
+                anchors {
+                    horizontalCenter: parent.horizontalCenter
+                    bottom: leftButton.top
+                    top: undefined
+                }
+            }
+            PropertyChanges {
+                target: taskStrip
+                width: parent.width
+                // Fill space between leftCorner (bottom) and the nav button group
+                height: taskStrip.visible ? (leftButton.y - leftCornerButton.y - leftCornerButton.height - Kirigami.Units.smallSpacing * 2) : 0
+            }
         }, State {
             name: "horizontal"
             when: !root.isVertical
@@ -264,6 +341,19 @@ Item {
                 height: parent.height
                 width: Kirigami.Units.gridUnit * 2
             }
+            // Task strip: horizontal layout — positioned between leftCornerButton (left) and leftButton (near center)
+            AnchorChanges {
+                target: taskStrip
+                anchors {
+                    verticalCenter: parent.verticalCenter
+                    left: leftCornerButton.right
+                    right: leftButton.left
+                }
+            }
+            PropertyChanges {
+                target: taskStrip
+                height: parent.height
+            }
         }
     ]
 }

containments/taskpanel/qml/NavigationPanelComponent.qml

@@ -35,6 +35,10 @@ MobileShell.NavigationPanel {
     foregroundColorGroup: forcedComplementary ? Kirigami.Theme.Complementary : Kirigami.Theme.Window
     shadow: forcedComplementary
 
+    // Convergence mode: expose running-app task strip
+    convergenceMode: ShellSettings.Settings.convergenceModeEnabled
+    taskModel: tasksModel
+
     MobileShellState.PanelSettingsDBusClient {
         id: panelSettings
         screenName: Screen.name
@@ -68,16 +72,20 @@ MobileShell.NavigationPanel {
     // ~~~~
     // navigation panel actions
 
-    // toggle task switcher button
+    // toggle task switcher button (KWin Overview in convergence mode, mobile task switcher otherwise)
     leftAction: MobileShell.NavigationPanelAction {
         id: taskSwitcherAction
 
         enabled: true
-        iconSource: "mobile-task-switcher"
+        iconSource: ShellSettings.Settings.convergenceModeEnabled ? "view-grid-symbolic" : "mobile-task-switcher"
-        shrinkSize: 4
+        shrinkSize: ShellSettings.Settings.convergenceModeEnabled ? 0 : 4
 
         onTriggered: {
-            Plasmoid.triggerTaskSwitcher();
+            if (ShellSettings.Settings.convergenceModeEnabled) {
+                Plasmoid.triggerOverview();
+            } else {
+                Plasmoid.triggerTaskSwitcher();
+            }
         }
     }
 

containments/taskpanel/taskpanel.cpp

@@ -31,4 +31,11 @@ void TaskPanel::triggerTaskSwitcher() const
     QDBusConnection::sessionBus().send(message);
 }
 
+void TaskPanel::triggerOverview() const
+{
+    QDBusMessage message = QDBusMessage::createMethodCall("org.kde.kglobalaccel", "/component/kwin", "org.kde.kglobalaccel.Component", "invokeShortcut");
+    message.setArguments({QStringLiteral("Overview")});
+    QDBusConnection::sessionBus().send(message);
+}
+
 #include "taskpanel.moc"

containments/taskpanel/taskpanel.h

@@ -15,4 +15,5 @@ class TaskPanel : public Plasma::Containment
 public:
     TaskPanel(QObject *parent, const KPluginMetaData &data, const QVariantList &args);
     Q_INVOKABLE void triggerTaskSwitcher() const;
+    Q_INVOKABLE void triggerOverview() const;
 };

envmanager/config.h

@@ -56,6 +56,7 @@ QMap<QString, QMap<QString, QVariant>> getKwinrcSettings(KSharedConfig::Ptr m_mo
                  {"blurEnabled", false}, // disable blur for performance reasons, we could reconsider in the future for more powerful devices
                  {"convergentwindowsEnabled", true}, // enable our convergent window plugin
                  {"mobiletaskswitcherEnabled", true}, // ensure the mobile task switcher plugin is enabled
+                 {"overviewEnabled", convergenceModeEnabled}, // enable KWin Overview effect in convergence mode for desktop-style task switching
                  {"screenedgeEnabled", false} // disable the blue highlighting of screen edge effects. TODO would be nice if we could only deactivate it on
                                               // touchscreen gestures and not mouse as well
              }},
@@ -76,7 +77,7 @@ QMap<QString, QMap<QString, QVariant>> getKwinrcSettings(KSharedConfig::Ptr m_mo
 
 // Have a separate list here because we need to trigger DBus calls to load/unload each effect/script.
 // Make sure that the effect/script is added to the kwinrc "Plugins" section above!
-const QList<QString> KWIN_EFFECTS = {"blur", "mobiletaskswitcher", "screenedge"};
+const QList<QString> KWIN_EFFECTS = {"blur", "mobiletaskswitcher", "overview", "screenedge"};
 const QList<QString> KWIN_SCRIPTS = {"convergentwindows"};
 
 // .config/plasma-mobile/ksmserver - immutable settings: