Fix dashboard E2E locator assertions

[Copilot]

The Dashboard CI E2E job failed because strict Playwright locators matched container elements with multiple child values and two headings named “Runs”.

• Heading scope

  • Restrict the page-title assertion to the h2 “Runs” heading.

• Collection assertions

  • Target summary-list li elements and table-row td cells rather than their containers.

await expect(page.getByRole('heading', {
  name: 'Runs',
  exact: true,
  level: 2
})).toBeVisible();

await expect(page.locator('.run-status-counts li'))
  .toContainText(['completed: 1', 'in-progress: 1']);