Notifications: ensure they are not sandwitched between panels

+ Always access lockScreen via panel service and removed deprecation
notice.

Services/Control/IPCService.qml

@@ -120,24 +120,8 @@ Item {
     // New preferred method - lock the screen
     function lock() {
       // Only lock if not already locked (prevents the red screen issue)
-      // Note: No unlock via IPC for security reasons
-      if (!lockScreen.active) {
-        lockScreen.triggeredViaDeprecatedCall = false;
-        lockScreen.active = true;
-      }
-    }
-
-    // Deprecated: Use 'lockScreen lock' instead
-    function toggle() {
-      // Mark as triggered via deprecated call - warning will show in lock screen
-      lockScreen.triggeredViaDeprecatedCall = true;
-
-      // Log deprecation warning for users checking logs
-      Logger.w("IPC", "The 'lockScreen toggle' IPC call is deprecated. Use 'lockScreen lock' instead.");
-
-      // Still functional for backward compatibility
-      if (!lockScreen.active) {
-        lockScreen.active = true;
+      if (!PanelService.lockScreen.active) {
+        PanelService.lockScreen.active = true;
       }
     }
   }