feat: Add create-board button to open-board screen (#1438)

Closes #1435

client/src/components/boards/AddBoardStep/ImportStep.jsx

@@ -0,0 +1,50 @@
+/*!
+ * Copyright (c) 2024 PLANKA Software GmbH
+ * Licensed under the Fair Use License: https://github.com/plankanban/planka/blob/master/LICENSE.md
+ */
+
+import React, { useCallback } from 'react';
+import PropTypes from 'prop-types';
+import { useTranslation } from 'react-i18next';
+import { Button } from 'semantic-ui-react';
+import { FilePicker, Popup } from '../../../lib/custom-ui';
+
+import styles from './ImportStep.module.scss';
+
+const ImportStep = React.memo(({ onSelect, onBack }) => {
+  const [t] = useTranslation();
+
+  const handleFileSelect = useCallback(
+    (type, file) => {
+      onSelect({
+        type,
+        file,
+      });
+
+      onBack();
+    },
+    [onSelect, onBack],
+  );
+
+  return (
+    <>
+      <Popup.Header onBack={onBack}>
+        {t('common.importBoard', {
+          context: 'title',
+        })}
+      </Popup.Header>
+      <Popup.Content>
+        <FilePicker accept=".json" onSelect={(file) => handleFileSelect('trello', file)}>
+          <Button fluid content={t('common.fromTrello')} icon="trello" className={styles.button} />
+        </FilePicker>
+      </Popup.Content>
+    </>
+  );
+});
+
+ImportStep.propTypes = {
+  onSelect: PropTypes.func.isRequired,
+  onBack: PropTypes.func.isRequired,
+};
+
+export default ImportStep;