Enable keyboard control in convergence dock

Make the convergence dock fully usable from the keyboard.

Tab now reaches Home, favorites, running tasks, and Overview.
Left and right move across section boundaries, and Enter/Space
triggers the same actions as mouse clicks.

Also add accessible role/name/press actions for these controls
so screen readers expose meaningful button semantics.

containments/homescreens/folio/qml/FavouritesBar.qml

@@ -125,6 +125,7 @@ MouseArea {
     Rectangle {
         id: homeButton
         visible: root.convergenceMode
+        activeFocusOnTab: root.convergenceMode
         anchors.left: parent.left
         anchors.top: parent.top
         anchors.bottom: parent.bottom
@@ -134,6 +135,26 @@ MouseArea {
             : (homeMouseArea.containsMouse ? Qt.rgba(Kirigami.Theme.textColor.r, Kirigami.Theme.textColor.g, Kirigami.Theme.textColor.b, 0.1) : "transparent")
         radius: Kirigami.Units.cornerRadius
 
+        Accessible.role: Accessible.Button
+        Accessible.name: i18n("Home")
+        Accessible.onPressAction: MobileShellState.ShellDBusClient.openHomeScreen()
+
+        Keys.onReturnPressed: MobileShellState.ShellDBusClient.openHomeScreen()
+        Keys.onEnterPressed: MobileShellState.ShellDBusClient.openHomeScreen()
+        Keys.onSpacePressed: MobileShellState.ShellDBusClient.openHomeScreen()
+        Keys.onRightPressed: {
+            let first = repeater.itemAt(0)
+            if (first) { first.keyboardFocus(); return }
+            let firstTask = taskRepeater.itemAt(0)
+            if (firstTask) { firstTask.forceActiveFocus(); return }
+            overviewButton.forceActiveFocus()
+        }
+
+        KeyboardHighlight {
+            anchors.fill: parent
+            visible: homeButton.activeFocus
+        }
+
         Kirigami.Icon {
             anchors.centerIn: parent
             width: Math.min(parent.width, parent.height) * 0.75
@@ -155,6 +176,7 @@ MouseArea {
     Rectangle {
         id: overviewButton
         visible: root.convergenceMode
+        activeFocusOnTab: root.convergenceMode
         anchors.right: parent.right
         anchors.top: parent.top
         anchors.bottom: parent.bottom
@@ -164,6 +186,26 @@ MouseArea {
             : (overviewMouseArea.containsMouse ? Qt.rgba(Kirigami.Theme.textColor.r, Kirigami.Theme.textColor.g, Kirigami.Theme.textColor.b, 0.1) : "transparent")
         radius: Kirigami.Units.cornerRadius
 
+        Accessible.role: Accessible.Button
+        Accessible.name: i18n("Overview")
+        Accessible.onPressAction: root.folio.triggerOverview()
+
+        Keys.onReturnPressed: root.folio.triggerOverview()
+        Keys.onEnterPressed: root.folio.triggerOverview()
+        Keys.onSpacePressed: root.folio.triggerOverview()
+        Keys.onLeftPressed: {
+            let lastTask = taskRepeater.itemAt(taskRepeater.count - 1)
+            if (lastTask) { lastTask.forceActiveFocus(); return }
+            let lastFav = repeater.itemAt(repeater.count - 1)
+            if (lastFav) { lastFav.keyboardFocus(); return }
+            homeButton.forceActiveFocus()
+        }
+
+        KeyboardHighlight {
+            anchors.fill: parent
+            visible: overviewButton.activeFocus
+        }
+
         Kirigami.Icon {
             anchors.centerIn: parent
             width: Math.min(parent.width, parent.height) * 0.75
@@ -320,9 +362,12 @@ MouseArea {
                     break;
                 case Qt.Key_Left:
                     if (isLocationBottom) {
-                        let nextDelegate = repeater.itemAt(delegate.index - 1);
+                        let prevDelegate = repeater.itemAt(delegate.index - 1);
-                        if (nextDelegate) {
+                        if (prevDelegate) {
-                            nextDelegate.keyboardFocus();
+                            prevDelegate.keyboardFocus();
+                            event.accepted = true;
+                        } else if (root.convergenceMode) {
+                            homeButton.forceActiveFocus();
                             event.accepted = true;
                         }
                     }
@@ -333,6 +378,14 @@ MouseArea {
                         if (nextDelegate) {
                             nextDelegate.keyboardFocus();
                             event.accepted = true;
+                        } else if (root.convergenceMode) {
+                            let firstTask = taskRepeater.itemAt(0);
+                            if (firstTask) {
+                                firstTask.forceActiveFocus();
+                            } else {
+                                overviewButton.forceActiveFocus();
+                            }
+                            event.accepted = true;
                         }
                     }
                     break;
@@ -852,9 +905,49 @@ MouseArea {
             required property int index
             required property var model
 
+            activeFocusOnTab: root.convergenceMode
+
             readonly property bool isLocationBottom: folio.HomeScreenState.favouritesBarLocation === Folio.HomeScreenState.Bottom
             readonly property string taskStorageId: root.runningTaskStorageId(taskDelegate.model)
 
+            Accessible.role: Accessible.Button
+            Accessible.name: taskDelegate.model.display || ""
+            Accessible.onPressAction: taskDelegate.activateTask()
+
+            function activateTask() {
+                var winIds = taskDelegate.model.WinIdList
+                if (winIds && winIds.length > 1) {
+                    if (thumbnailPopup.opened && thumbnailPopup.taskIndex === taskDelegate.index) {
+                        thumbnailPopup.close()
+                    } else {
+                        thumbnailPopup.targetDelegate = taskDelegate
+                        thumbnailPopup.taskIndex = taskDelegate.index
+                        thumbnailPopup.windowIds = winIds
+                        thumbnailPopup.isGroup = taskDelegate.model.IsGroupParent === true
+                        thumbnailPopup.open()
+                    }
+                } else {
+                    thumbnailPopup.close()
+                    tasksModel.requestActivate(tasksModel.makeModelIndex(taskDelegate.index))
+                }
+            }
+
+            Keys.onReturnPressed: taskDelegate.activateTask()
+            Keys.onEnterPressed: taskDelegate.activateTask()
+            Keys.onSpacePressed: taskDelegate.activateTask()
+            Keys.onLeftPressed: {
+                let prev = taskRepeater.itemAt(taskDelegate.index - 1)
+                if (prev) { prev.forceActiveFocus(); return }
+                let lastFav = repeater.itemAt(repeater.count - 1)
+                if (lastFav) { lastFav.keyboardFocus(); return }
+                homeButton.forceActiveFocus()
+            }
+            Keys.onRightPressed: {
+                let next = taskRepeater.itemAt(taskDelegate.index + 1)
+                if (next) { next.forceActiveFocus(); return }
+                overviewButton.forceActiveFocus()
+            }
+
             // Position after all favourites
             property double fromCenterValue: (repeater.count + taskDelegate.index) - (root.totalItemCount / 2)
             Behavior on fromCenterValue {
@@ -881,6 +974,11 @@ MouseArea {
                     : (taskMouseArea.containsMouse ? Qt.rgba(Kirigami.Theme.textColor.r, Kirigami.Theme.textColor.g, Kirigami.Theme.textColor.b, 0.1) : "transparent")
             }
 
+            KeyboardHighlight {
+                anchors.fill: parent
+                visible: taskDelegate.activeFocus
+            }
+
             // Task icon
             Kirigami.Icon {
                 anchors.centerIn: parent
@@ -970,22 +1068,7 @@ MouseArea {
                         thumbnailShowTimer.stop()
                         taskContextMenu.open();
                     } else {
-                        var winIds = taskDelegate.model.WinIdList
+                        taskDelegate.activateTask()
-                        if (winIds && winIds.length > 1) {
-                            // Multiple windows: toggle thumbnail popup
-                            if (thumbnailPopup.opened && thumbnailPopup.taskIndex === taskDelegate.index) {
-                                thumbnailPopup.close()
-                            } else {
-                                thumbnailPopup.targetDelegate = taskDelegate
-                                thumbnailPopup.taskIndex = taskDelegate.index
-                                thumbnailPopup.windowIds = winIds
-                                thumbnailPopup.isGroup = taskDelegate.model.IsGroupParent === true
-                                thumbnailPopup.open()
-                            }
-                        } else {
-                            thumbnailPopup.close()
-                            tasksModel.requestActivate(tasksModel.makeModelIndex(taskDelegate.index));
-                        }
                     }
                 }
                 onContainsMouseChanged: {