dock: add bar strip with pin toggle when pinned, hide from main bar

shell/dock/AppletDock.qml

@@ -136,10 +136,55 @@ PanelWindow {
         }
     }
 
+    // Dock bar - mirrors main bar style, hosts dock toggle when pinned
+    Item {
+        id: _dockBar
+        anchors.top: parent.top
+        anchors.left: parent.left
+        anchors.right: parent.right
+        height: S.Theme.barHeight
+        visible: S.DockState.mode === "pinned"
+
+        transform: Translate {
+            x: root._slideX
+        }
+
+        Rectangle {
+            anchors.fill: parent
+            color: S.Theme.base00
+        }
+
+        // Bottom border - gradient matching bar style (base0C to base09, but just the right end)
+        Rectangle {
+            anchors.left: parent.left
+            anchors.right: parent.right
+            anchors.bottom: parent.bottom
+            height: 1
+            color: S.Theme.base09
+        }
+
+        // Dock toggle
+        M.BarGroup {
+            anchors.centerIn: parent
+            M.BarModule {
+                tooltip: "Unpin dock"
+                onTapped: S.DockState.toggle()
+
+                M.BarIcon {
+                    icon: "\uDB80\uDD8B"
+                    anchors.verticalCenter: parent.verticalCenter
+                }
+            }
+        }
+    }
+
     // Content - inset past the edge line + gap
     Flickable {
         id: _flickable
-        anchors.fill: parent
+        anchors.top: _dockBar.visible ? _dockBar.bottom : parent.top
+        anchors.left: parent.left
+        anchors.right: parent.right
+        anchors.bottom: parent.bottom
         anchors.leftMargin: S.Theme.groupSpacing + 1
         contentHeight: _column.height
         clip: true