Save device url in all cases and load printer url after hot-reload finishes

src/slic3r/GUI/GUI_App.cpp

@@ -4238,6 +4238,15 @@ void GUI_App::recreate_GUI(const wxString &msg_name)
 
     update_publish_status();
 
+    // The Device tab's PrinterWebView is recreated during this GUI rebuild. Re-issue
+    // the printer URL once the new window is realized and the webview backend is ready,
+    // otherwise the tab can stay blank until the next real restart (non-Bambu/webui
+    // printers only; load_printer_url() is a no-op for the Bambu device tab).
+    CallAfter([this] {
+        if (mainframe)
+            mainframe->load_printer_url();
+    });
+
     m_is_recreating_gui = false;
 
     BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << "recreate_GUI exit";