refactor(tests): migrate e2e test suite from Cypress to Playwright

Replaces the Cypress setup with @playwright/test + @nextcloud/e2e-test-server.
All 9 existing tests pass locally. The comment activity test remains skipped
pending a fix to the comments app (pre-existing skip from the Cypress suite).

Key changes:
- Add playwright.config.ts with managed Docker server via start-server.mjs
- Rewrite e2e helpers (filesUtils, sidebarUtils) using Playwright APIs
- Fix: replace CSS.escape() (browser-only API) with a Node-safe cssEscape()
- Fix: hover file row before clicking Actions to ensure dropdown opens
- Fix: skip disabled checkboxes in settings test (email disabled without SMTP)
- Fix: use numeric values for frequency select assertions (Weekly=2, Hourly=0)
- Add GitHub Actions workflow (playwright.yml), remove cypress.yml
- Remove all Cypress dependencies and config files

Signed-off-by: Anna Larch <anna@larch.dev>
AI-Assisted-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: miaulalala

.github/workflows/cypress.yml

@@ -0,0 +1,84 @@
+# SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+# SPDX-License-Identifier: MIT
+
+name: Playwright
+
+on: pull_request
+
+concurrency:
+  group: playwright-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+env:
+  APP_NAME: ${{ github.event.repository.name }}
+  BRANCH: ${{ github.base_ref || github.ref_name }}
+
+jobs:
+  playwright:
+    runs-on: ubuntu-latest
+
+    name: Playwright E2E tests
+
+    steps:
+      - name: Checkout app
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          persist-credentials: false
+
+      - name: Read package.json node and npm engines version
+        uses: skjnldsv/read-package-engines-version-actions@06d6baf7d8f41934ab630e97d9e6c0bc9c9ac5e4 # v3
+        id: versions
+        with:
+          fallbackNode: '^24'
+          fallbackNpm: '^11'
+
+      - name: Set up node ${{ steps.versions.outputs.nodeVersion }}
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
+        with:
+          node-version: ${{ steps.versions.outputs.nodeVersion }}
+
+      - name: Set up npm ${{ steps.versions.outputs.npmVersion }}
+        run: npm i -g 'npm@${{ steps.versions.outputs.npmVersion }}'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Install Playwright browsers
+        run: npx playwright install chromium --with-deps
+
+      - name: Build app
+        run: TESTING=true npm run build --if-present
+
+      - name: Run Playwright tests
+        run: npx playwright test
+        env:
+          BRANCH: ${{ env.BRANCH }}
+          CI: true
+
+      - name: Upload Playwright report
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
+        if: always()
+        with:
+          name: playwright-report
+          path: playwright-report/
+          retention-days: 30
+
+      - name: Upload Playwright traces
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
+        if: failure()
+        with:
+          name: playwright-traces
+          path: test-results/
+          retention-days: 7
+
+  summary:
+    runs-on: ubuntu-latest-low
+    needs: playwright
+    if: always()
+    name: playwright-summary
+    steps:
+      - name: Summary status
+        run: if ${{ needs.playwright.result != 'success' && needs.playwright.result != 'skipped' }}; then exit 1; fi