extract PinnableSection base component from 12 bar modules

shell/modules/NotificationsModule.qml

@@ -5,30 +5,13 @@ import "." as M
 import "../services" as S
 import "../applets" as C
 
-M.BarSection {
+M.PinnableSection {
     id: root
     spacing: S.Theme.moduleSpacing
-    tooltip: ""
+    _panelHovered: hoverPanel.panelHovered
 
     readonly property bool hasUrgent: S.NotifService.list.some(n => n.urgency === NotificationUrgency.Critical && n.state !== "dismissed")
 
-    property bool _pinned: false
-    readonly property bool _anyHover: root._hovered || hoverPanel.panelHovered
-    readonly property bool _showPanel: _anyHover || _pinned
-
-    on_AnyHoverChanged: {
-        if (_anyHover)
-            _unpinTimer.stop();
-        else if (_pinned)
-            _unpinTimer.start();
-    }
-
-    Timer {
-        id: _unpinTimer
-        interval: 500
-        onTriggered: root._pinned = false
-    }
-
     M.BarIcon {
         icon: {
             if (S.NotifService.dnd)