fix: prevent notification list overscrolling

Added boundsBehavior: Flickable.StopAtBounds to the notification
list view to prevent overscrolling beyond the content boundaries.
This improves the user experience by providing more natural scrolling
behavior and preventing the list from bouncing when reaching the edges.

Log: Improved notification list scrolling behavior

Influence:
1. Test scrolling to the top and bottom of the notification list
2. Verify that list stops at boundaries without overscrolling
3. Check that normal scrolling functionality remains intact
4. Test with various numbers of notifications (empty, few, many)
5. Verify behavior on different screen sizes and resolutions

PMS: BUG-324863

Author: caimc123456

panels/notification/center/NotifyView.qml

@@ -61,6 +61,7 @@ Control {
         snapMode: ListView.SnapToItem
         keyNavigationEnabled: false
         activeFocusOnTab: false
+        boundsBehavior: Flickable.StopAtBounds
         ScrollBar.vertical: ScrollBar { }
         topMargin: 20
         leftMargin: NotifyStyle.leftMargin