feat(jenkins): enhance E2E testing and debugging capabilities

- Updated Jenkinsfile to include Playwright's trace option for better debugging on test failures.
- Added archiving of test results, including trace files, error context, and screenshots for failed tests.
- Enhanced error handling in `auth.setup.ts` to log diagnostic information when authentication fails, improving visibility into issues.

These changes aim to improve the reliability and debuggability of E2E tests.

Jenkinsfile

@@ -334,7 +334,9 @@ pipeline {
 
                                 E2E_EXIT=0
                                 PLAYWRIGHT_JUNIT_OUTPUT_NAME=playwright-results.xml \
-                                    pnpm exec playwright test --reporter=junit,html || E2E_EXIT=$?
+                                    pnpm exec playwright test \
+                                        --reporter=junit,html \
+                                        --trace=retain-on-failure || E2E_EXIT=$?
 
                                 exit "$E2E_EXIT"
                             '
@@ -342,6 +344,9 @@ pipeline {
                             "$WORKSPACE/frontend/playwright-results.xml" 2>/dev/null || true
                         docker cp "$C:/workspace/frontend/playwright-report" \
                             "$WORKSPACE/frontend/playwright-report" 2>/dev/null || true
+                        # test-results contiene trace.zip + error-context.md + screenshots por test fallido
+                        docker cp "$C:/workspace/frontend/test-results" \
+                            "$WORKSPACE/frontend/test-results" 2>/dev/null || true
                     '''
                 }
             }
@@ -349,6 +354,9 @@ pipeline {
                 always {
                     junit allowEmptyResults: true, testResults: 'frontend/playwright-results.xml'
                     archiveArtifacts artifacts: 'frontend/playwright-report/**', allowEmptyArchive: true
+                    // Artefactos de debug: trace.zip (abrir con `pnpm exec playwright show-trace`),
+                    // error-context.md (snapshot del DOM al fallo) y screenshots por test fallido.
+                    archiveArtifacts artifacts: 'frontend/test-results/**', allowEmptyArchive: true
                 }
             }
         }