Headless Linux runners have no display, so 'flutter test integration_test'
fails to launch the GTK app ('The log reader stopped unexpectedly, or never
started'). Wrap integration/patrol layers in xvfb-run with a 24-bit screen
and install xvfb + mesa DRI driver for headless GL. macOS/local runs are
unaffected (no xvfb-run -> command runs directly).
Co-authored-by: Haitao Pan <haitao.pan@xworkmate.ai>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
