quickshell: fix some warnings

.config/quickshell/modules/notificationPopup/NotificationPopup.qml

@@ -15,7 +15,7 @@ Scope {
     PanelWindow {
         id: root
         visible: (Notifications.popupList.length > 0)
-        screen: Quickshell.screens.find(s => s.name === Hyprland.focusedMonitor?.name)
+        screen: Quickshell.screens.find(s => s.name === Hyprland.focusedMonitor?.name) ?? null
 
         WlrLayershell.namespace: "quickshell:notificationPopup"
         WlrLayershell.layer: WlrLayer.Overlay

.config/quickshell/modules/overview/Overview.qml

@@ -92,8 +92,8 @@ Scope {
                 visible: GlobalStates.overviewOpen
                 anchors {
                     horizontalCenter: parent.horizontalCenter
-                    top: !ConfigOptions.bar.bottom ? parent.top : null
-                    bottom: ConfigOptions.bar.bottom ? parent.bottom : null
+                    top: !ConfigOptions.bar.bottom ? parent.top : undefined
+                    bottom: ConfigOptions.bar.bottom ? parent.bottom : undefined
                 }
 
                 Keys.onPressed: (event) => {

.config/quickshell/modules/sidebarLeft/Anime.qml

@@ -562,8 +562,10 @@ Item {
                     text: "•"
                 }
 
-                Rectangle { // NSFW toggle
+                Item { // NSFW toggle
+                    visible: width > 0
                     implicitWidth: switchesRow.implicitWidth
+                    Layout.fillHeight: true
 
                     RowLayout {
                         id: switchesRow