hoverpanel: add max height with flickable scrolling when content overflows

shell/modules/HoverPanel.qml

@@ -373,12 +373,23 @@ PanelWindow {
                 }
             }
 
+            Flickable {
+                id: _flickable
+                width: parent.width
+                height: Math.min(panelContent.height, _maxContentHeight)
+                contentHeight: panelContent.height
+                clip: contentHeight > height
+                boundsBehavior: Flickable.StopAtBounds
+
+                readonly property real _maxContentHeight: (root.screen?.height ?? 1080) * 0.6 - (_headerItem.visible ? _headerItem.height : 0)
+
                 Column {
                     id: panelContent
                     width: parent.width
                 }
             }
         }
+    }
 
     // Border overlay — on top of content so full-bleed items don't cover it
     Rectangle {