Add ToastService, NToast etc

Modules/Toast/ToastManager.qml

@@ -0,0 +1,54 @@
+import QtQuick
+import QtQuick.Controls
+import Quickshell
+import Quickshell.Wayland
+import qs.Commons
+import qs.Services
+import qs.Widgets
+
+// ToastManager creates toast overlays on each screen
+Variants {
+  model: Quickshell.screens
+
+  delegate: PanelWindow {
+    id: root
+
+    required property ShellScreen modelData
+    readonly property real scaling: ScalingService.scale(screen)
+    screen: modelData
+
+    // Position at top, centered horizontally
+    anchors {
+      top: true
+      left: true
+      right: true
+    }
+    
+    // Small height when hidden, appropriate height when visible
+    implicitHeight: toast.visible ? toast.height + Style.barHeight * scaling + Style.marginS * scaling : 1
+
+    // Transparent background
+    color: Color.transparent
+    
+    // High layer to appear above other panels  
+    //WlrLayershell.layer: WlrLayer.Overlay
+    WlrLayershell.keyboardFocus: WlrKeyboardFocus.None
+    exclusionMode: PanelWindow.ExclusionMode.Ignore
+
+    NToast {
+      id: toast
+      scaling: root.scaling
+      
+      // Position just below where the bar would be
+      targetY: Style.barHeight * scaling + Style.marginS * scaling
+      
+      Component.onCompleted: {
+        // Register this toast with the service
+        ToastService.currentToast = toast
+        
+        // Connect dismissal signal
+        toast.dismissed.connect(ToastService.onToastDismissed)
+      }
+    }
+  }
+}