test: add verification for date input clearing with empty string

[Copilot]

Adds test coverage for the date input empty string reset behavior addressed in #5440.

Changes

• Added test in input.spec.tsx verifying DBInput with type="date" can be cleared by setting value to empty string
• Test validates behavior matches native input[type="date"] element behavior
• Added blob-report/ to .gitignore to exclude Playwright test artifacts

Test Case

test('should clear date input when value is set to empty string', async ({
  mount,
  page
}) => {
  const component = await mount(
    <DBInput label="Date" type="date" value="2025-01-15" />
  );
  const input = page.locator('input[type="date"]');
  
  await expect(input).toHaveValue('2025-01-15');
  
  // Simulate empty string reset
  await component.evaluate((node: any, newValue: string) => {
    const inputElement = node.querySelector('input');
    if (inputElement) {
      inputElement.value = newValue;
      inputElement.dispatchEvent(new Event('input', { bubbles: true }));
      inputElement.dispatchEvent(new Event('change', { bubbles: true }));
    }
  }, '');
  
  await expect(input).toHaveValue('');
});

---

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🔭🐙🐈 Test this branch here: https://design-system.deutschebahn.com/core-web/review/copilot/sub-pr-5440

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Latest commit: 0346ecd

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