fix multi-monitor: use ShellScreen type instead of var to avoid shadowing C++ screen property

shell/dock/AppletDock.qml

@@ -11,7 +11,7 @@ import "../modules" as M
 PanelWindow {
     id: root
 
-    required property var screen
+    required property ShellScreen screen
 
     visible: _winVisible
     color: "transparent"

shell/dock/DockEdgeTrigger.qml

@@ -8,7 +8,7 @@ import "../services" as S
 PanelWindow {
     id: root
 
-    required property var screen
+    required property ShellScreen screen
 
     visible: !S.DockState.open
     color: "transparent"

shell/modules/BackgroundOverlay.qml

@@ -8,7 +8,7 @@ import "../services" as S
 PanelWindow {
     id: root
 
-    required property var screen
+    required property ShellScreen screen
 
     color: "transparent"
 

shell/modules/Bar.qml

@@ -8,7 +8,7 @@ import "../services" as S
 PanelWindow {
     id: bar
 
-    required property var screen
+    required property ShellScreen screen
 
     color: "transparent"
     WlrLayershell.layer: WlrLayer.Bottom

shell/modules/NotifPopup.qml

@@ -8,7 +8,7 @@ import "../services" as S
 PanelWindow {
     id: root
 
-    required property var screen
+    required property ShellScreen screen
 
     visible: S.NotifService.popups.length > 0 && !S.NiriIpc.overviewOpen
     color: "transparent"

shell/modules/OverviewBackdrop.qml

@@ -8,7 +8,7 @@ import "../applets" as C
 PanelWindow {
     id: root
 
-    required property var screen
+    required property ShellScreen screen
 
     color: "transparent"
 

shell/modules/ScreenCapture.qml

@@ -6,7 +6,7 @@ import "../services" as S
 PanelWindow {
     id: root
 
-    required property var screen
+    required property ShellScreen screen
 
     color: "transparent"
     WlrLayershell.layer: WlrLayer.Background

shell/modules/Tooltip.qml

@@ -7,7 +7,7 @@ import "../services" as S
 PanelWindow {
     id: root
 
-    required property var screen
+    required property ShellScreen screen
 
     visible: _winVisible
     color: "transparent"