refactor: extract createSessionFromReportPage helper to pages/sessions

[empiricalrun]

Summary

Extracted a repeated 6-line block into a reusable helper method createSessionFromReportPage in tests/pages/sessions.ts.

What was duplicated

The exact same sequence appeared twice in tests/tool-execution/session.spec.ts:

1. Click "New Session" button from a test run / report page
2. Fill in the prompt placeholder
3. Click "Create"
4. Wait for and capture the new browser tab opened via the toast's "Open" button
5. Assert the new tab is at a session URL

Change

tests/pages/sessions.ts — Added createSessionFromReportPage(page, prompt):

export async function createSessionFromReportPage(page: Page, prompt: string) {
  await page.getByRole('button', { name: 'New Session' }).click();
  await page.getByPlaceholder('Enter an initial prompt or drag and drop a file here').fill(prompt);
  await page.getByRole('button', { name: 'Create' }).click();
  const sessionPagePromise = page.context().waitForEvent('page');
  await page.getByRole('button', { name: 'Open', exact: true }).click();
  const sessionPage = await sessionPagePromise;
  await expect(sessionPage).toHaveURL(/\/sessions\/[^/?]+/);
  return sessionPage;
}

tests/tool-execution/session.spec.ts — Both duplicated blocks replaced with a single call to createSessionFromReportPage, imported from pages/sessions.

TypeScript compilation passes with no errors.

PR created from session #127726

^{Updated at 2026-05-03 04:54:07.710 UTC}