add slide-in applet dock with collapsible cards, edge trigger, and bar module toggle

shell/modules/Bar.qml

@@ -216,10 +216,13 @@ PanelWindow {
                 }
             }
 
-            // Power
+            // Power + Dock
             M.BarGroup {
                 rightEdge: true
                 M.BatteryModule {}
+                M.DockModule {
+                    visible: S.Modules.dock.enable
+                }
                 M.PowerModule {
                     visible: S.Modules.power.enable
                 }