test(playwright): add playwright report to track changes + correct playwright parameters

ci: fix actions/checkout@v6 → @v4 (v6 does not exist)

GitHub started rejecting invalid action versions at parse time,
causing every CI run to fail with 0s / 'workflow file issue'
before any jobs could start.

 * test(e2e): only no retry
 * test(e2e): use static name in tests to facilitate screenshot comparaison
 * test(e2e): update linux screenshots
 * test(e2e): adapt test due to user-vignette generation

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/playwright-update-snapshots.yml

@@ -26,11 +26,17 @@ jobs:
     - name: Install Node dependencies
       run: npm ci
 
+    - name: Build OxiCloud (release)
+      working-directory: .
+      run: cargo build --release
+
     - name: Install Playwright browsers
       run: npx playwright install --with-deps
 
     - name: Update snapshots
       run: npm test -- --update-snapshots
+      env:
+        BUILD_TARGET: release
 
     - name: Commit updated snapshots
       uses: stefanzweifel/git-auto-commit-action@v5