RG-2473 don't unmount react root because it can be reused later (#7656)

minor: log auth error

Author: andrey-skl

src/header/smart-profile.tsx

@@ -56,7 +56,8 @@ export default class SmartProfile extends PureComponent<SmartProfileProps, Smart
     try {
       await this.props.auth.login();
     } catch (err) {
-      // do nothing
+      // eslint-disable-next-line no-console
+      console.debug('Profile login errored', err);
     } finally {
       this.setState({loading: false});
     }

src/login-dialog/service.tsx

@@ -28,6 +28,9 @@ export default function showAuthDialog(props: LoginDialogAttrs = {onCancel: noop
   });
 
   return () => {
-    reactRoot.unmount();
+    renderLoginDialog({
+      ...props,
+      show: false
+    });
   };
 }