Add data-description attributes to GalaxyWizard.vue and DatasetError.vue
for test selectors. Add navigation helpers and Selenium test exercising
the inline error analysis widget with the static agent backend.
Fix broken stderr redirect in detect_errors.xml (>2& → >&2).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
before stdout and stderr were modified while testing for exit codes and
regexes. this had the potential problem that later tests also checked
this output which might lead to confusions.
furthermore a marker line has been introduces which differentiates
Galaxy and original tool output
