Fix activating browser windows on Wayland

QDesktopServices::openUrl does not have XDG activation support yet so it can't raise an existing browser window when opening URLs

Instead use KIO::OpenUrlJob, which does support that

imports/NeoChat/Component/Timeline/ImageDelegate.qml

@@ -115,8 +115,8 @@ TimelineContainer {
         }
 
         function openSavedFile() {
-            if (Qt.openUrlExternally(progressInfo.localPath)) return;
-            if (Qt.openUrlExternally(progressInfo.localDir)) return;
+            if (UrlHelper.openUrl(progressInfo.localPath)) return;
+            if (UrlHelper.openUrl(progressInfo.localDir)) return;
         }
     }
 }