test(playwright): additional dataset list playwright tests (#36684)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

superset-frontend/playwright/components/modals/ImportDatasetModal.ts

@@ -0,0 +1,73 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { Modal, Input } from '../core';
+
+/**
+ * Import dataset modal for uploading dataset export files.
+ * Handles file upload, overwrite confirmation, and import submission.
+ */
+export class ImportDatasetModal extends Modal {
+  private static readonly SELECTORS = {
+    FILE_INPUT: '[data-test="model-file-input"]',
+    OVERWRITE_INPUT: '[data-test="overwrite-modal-input"]',
+  };
+
+  /**
+   * Upload a file to the import modal
+   * @param filePath - Absolute path to the file to upload
+   */
+  async uploadFile(filePath: string): Promise<void> {
+    await this.page
+      .locator(ImportDatasetModal.SELECTORS.FILE_INPUT)
+      .setInputFiles(filePath);
+  }
+
+  /**
+   * Fill the overwrite confirmation input (only needed if dataset exists)
+   */
+  async fillOverwriteConfirmation(): Promise<void> {
+    const input = new Input(
+      this.page,
+      this.body.locator(ImportDatasetModal.SELECTORS.OVERWRITE_INPUT),
+    );
+    await input.fill('OVERWRITE');
+  }
+
+  /**
+   * Get the overwrite confirmation input locator
+   */
+  getOverwriteInput() {
+    return this.body.locator(ImportDatasetModal.SELECTORS.OVERWRITE_INPUT);
+  }
+
+  /**
+   * Check if overwrite confirmation is visible
+   */
+  async isOverwriteVisible(): Promise<boolean> {
+    return this.getOverwriteInput().isVisible();
+  }
+
+  /**
+   * Click the Import button in the footer
+   */
+  async clickImport(): Promise<void> {
+    await this.clickFooterButton('Import');
+  }
+}