Test/e2e login auth

[n3c777]

This PR introduces three components that enable two separate frontend E2E testing functionalities.

preSetup
This component is for testing areas of Compass that don’t require a logged-in user, such as signin and signup. These tests run independently.
To have Playwright recognize these files as part of preSetup, their filenames must include preSetup. This is the only component with this naming requirement; the others work normally.
A basic login test (signIn.setup.spec.ts and signInPage) has been added to demonstrate preSetup. It uses the POM design pattern.

setup
This component sets up the postSetup tests. It logs in by directly contacting Firebase and retrieves the auth state, which is then saved for future use. By avoiding UI-based login, this reduces flakiness and removes the need to re-login for every test.

postSetup
This is where the majority of E2E tests will live. It leverages the saved auth state from setup.ts as described above.
A small demonstration test (postSetup.spec.ts) shows postSetup functionality, but it can easily be replaced with other tests. The main advantage of this three-component setup is the ease of adding postSetup tests without worrying about login or authentication setup.

Hopefully this makes sense. The only thing missing is further documentation, which could be added maybe as a README for a more in-depth explanation.

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[MartinBraquet]

Let's fix the failing preSetup and postSetup tests, otherwise it's a great structure!

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Project	Deployment	Preview	Comments	Updated (UTC)
compass	Ready	Preview	Comment	Nov 18, 2025 10:18pm

[MartinBraquet]

Test still errors out here. Not sure why right now.

  1) [main] › tests/e2e/web/specs/postSignIn.spec.ts:4:5 › should be logged in and see settings page 
    Error: expect(locator).toBeVisible() failed
    Locator:  getByRole('heading', { name: 'Theme' })
    Expected: visible
    Received: <element(s) not found>
    Timeout:  5000ms
    Call log:
      - Expect "toBeVisible" with timeout 5000ms
      - waiting for getByRole('heading', { name: 'Theme' })
       7 |   await expect(
       8 |     authenticatedPage.getByRole('heading', { name: 'Theme' })
    >  9 |   ).toBeVisible();
         |     ^
      10 | });
        at /home/runner/work/Compass/Compass/tests/e2e/web/specs/postSignIn.spec.ts:9:5
    Error Context: test-results/web-specs-postSignIn-shoul-5e404-ed-in-and-see-settings-page-main/error-context.md

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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