Screener Flow E2E Tests

## User Story
As a dev working on BDT, I would like E2E tests to exist that prevent critical workflows from being broken by added changes.

## Acceptance Criteria

- Create Playwright tests for the following scenarios:
- Creating a Screener
- Creating a Benefit within a Screener
- Configuring a Check for a Screener-Benefit
- Creating a Screener Form
- Testing a Screener Form on the Preview Page
- Publishing a Screener

Start by locating the repository's Playwright test setup and the entry points for the Screener workflows. Add coverage for creating a Screener and Benefit, configuring a Check, creating and previewing a Screener Form, and publishing a Screener; done means each listed scenario runs as an end-to-end test.

Written by the indexing model from the issue text.