core: shell state manager

shell.qml

@@ -5,7 +5,9 @@ import "Shell"
 
 ShellRoot {
     id: baseShell
-    property bool isOpen: false
+
+    // Use the singleton directly; it controls the shell state globally.
+    property bool isOpen: ShellStateManager.shellOpen
 
     WLRLayerTopbar {
         visible: baseShell.isOpen
@@ -20,7 +22,7 @@ ShellRoot {
         triggerDescription: "Toggle the menu"
         name: "shell_toggle"
         onReleased: {
-            baseShell.isOpen = !baseShell.isOpen;
+            ShellStateManager.toggleShell()
         }
     }
 
@@ -28,10 +30,10 @@ ShellRoot {
         target: "deltarune.shell"
         enabled: true
         function open(): void {
-            baseShell.isOpen = true;
+            ShellStateManager.openShell()
         }
         function close(): void {
-            baseShell.isOpen = false;
+            ShellStateManager.closeShell()
         }
     }
 }