rero / rero-ils / 30333989079

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test(e2e): replace Cypress with Playwright E2E tests

Replace the unmaintained Cypress test suite (last updated 2020) with a
modern Playwright-based suite using pytest-playwright. All tests are
driven via the REST API for state management and the Angular UI only
for interaction assertions.

* delete all Cypress specs, fixtures, support files and the
  scripts/cypress runner
* add pytest-playwright to dev dependencies and configure poe tasks:
  e2e (all browsers, cross-browser mark), e2e_chromium, e2e_firefox,
  e2e_webkit
* add bootstrap step to install Chromium, Firefox and WebKit browsers
* add E2E=yes to conftest.py so pytest-invenio does not skip the tests
* introduce isolated browser contexts per fixture so concurrent
  librarian/patron/spock sessions do not share cookies
* add @pytest.mark.chromium_only for tests requiring Angular PrimeNG
  form submission (document editor, collections, templates); these
  tests are excluded from Firefox/WebKit runs
* implement test_login.py: librarian login, logout, patron login
* implement test_circulation_scenario_a.py: standard loan at owning
  library (ADD_REQUEST_1.1 → VALIDATE_1.2 → CHECKOUT_2.1 →
  CHECKIN_3.1.1)
* implement test_circulation_scenario_b.py: standard loan with
  inter-library transit (VALIDATE_1.2 → CHECKIN_4.1 → CHECKOUT_2.1 →
  CHECKIN_3.1.2 → CHECKIN_5.1.1)
* implement test_circulation_scenario_c.py: multiple in-transit
  requests, two patrons
* implement test_circulation_scenario_d.py: denied actions and
  unconventional workflow
* implement test_circulation_scenario_e.py: complex workflow with
  mid-cycle cancellations and pickup location changes
* implement test_document_editor.py: create document via Angular editor
  (chromium_only)
* implement test_collections.py: create, edit and delete a collection
  (chromium_only)
* add tests/e2e/README.md documenting how to run the tests, why
  chromium_only exists and how to remove it via rero-ils-ui/ng-core
* rename "cypress" to "e2e" in dat... (continued)

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