Создайте ИИ-агента для автотестирования приложения за 7 минут

Here is a Playwright test recorded with Codegen for my app.

[PASTE RECORDED CODE HERE]

Act as a QA automation agent. Do the following:
1. Add explicit assertions after every key action (page title, visible text, URL contains).
2. Wrap flaky network waits in waitForResponse / waitForLoadState('networkidle').
3. Extract selectors into a selectors object at the top.
4. Add a data-testid strategy suggestion for [APP_NAME] in comments.
5. Output the final refactored test as a single ready-to-run file, plus a 3-bullet summary of what you changed.

App description: [ONE-SENTENCE DESCRIPTION OF YOUR APP]

Based on the test above, generate 3 additional Playwright test cases for [APP_NAME]:
1. Login with invalid credentials - assert error message is visible.
2. Submit form with empty required fields - assert validation messages.
3. Delete an entity and verify it disappears from the list.

Use the same selectors object. Output as a single file, one describe block with 3 it blocks.