Add test for bulk exporting datasets via bulk select mode.
The test verifies:
- Bulk select mode can be enabled
- Datasets can be selected via checkboxes
- Export bulk action triggers download
- Downloaded file is a zip file

Add Checkbox component to components/core for checkbox interactions.
Add bulk select methods to DatasetListPage:
- getBulkSelectButton() / clickBulkSelectButton()
- getDatasetCheckbox() / selectDatasetCheckbox()
- getBulkActionButton() / clickBulkAction()
- getBulkSelectControls()

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Add E2E test for the create dataset wizard flow:
- Navigate to create dataset page via "+ Dataset" button
- Verify cascading select dropdowns (database → schema → table)
- Verify create and explore button availability

Add supporting components:
- Select component for Ant Design combobox interactions (with type-to-filter)
- CreateDatasetPage page object with component-based selectors

Refactor test file to initialize page objects only in tests that use them.

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Add E2E test for editing a dataset description:
- Click edit action to open DatasourceModal
- Update description field
- Save with confirmation dialog
- Verify toast and persisted change

Add supporting components:
- EditDatasetModal using Modal base class and component abstractions
- ConfirmDialog for reusable OK/Cancel confirmation dialogs
- Textarea component for multi-line text input
- Tabs component for tab navigation
- clickEditAction method in DatasetListPage

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

The create wizard test was failing with strict mode violation because
getByRole('button', { name: 'Dataset' }) matched both the "Datasets"
nav link and the "+ Dataset" button. Added clickAddDataset() method
to DatasetListPage with a regex pattern that specifically targets the
"+ Dataset" button.

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

1. Select.clickOption: Changed from getByTitle() to Ant Design's
   .ant-select-item-option class selector since dropdown options
   don't have title attributes.

2. Export tests: Changed from waitForEvent('download') to API
   response interception. The export uses blob download via fetch
   (downloadBlob with createObjectURL), which doesn't trigger
   Playwright's download event consistently. Now verifies the
   export API response headers (content-type and content-disposition).

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

1. Renamed "bulk export multiple datasets" to "export dataset via bulk
   select action" - more accurately describes test scope (tests bulk
   select mechanism, not multi-item export).

2. Added virtual dataset guard in first test - fails fast with clear
   message if example dataset is missing or not virtual, which is
   required for duplicate functionality used in other tests.

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

- Add SELECT_SELECTORS constants matching Cypress patterns
- Use .getByText() with exact match for option selection
- Wait for dropdown visibility before finding options
- Remove invalid dataset_type guard (field not in list API response)

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

- Add acceptDownloads: true to Playwright config for export tests
- Create AceEditor component for Ace Editor interactions
- Fix Select.clickOption to handle multiple dropdowns using :not(.ant-select-dropdown-hidden)
- Update CreateDatasetPage to use data-test selectors instead of fromRole
- Update EditDatasetModal to use AceEditor instead of Textarea for description
- Update test to use getDescription() for AceEditor value verification

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>