fix(docker): a crash-looping service belongs in Needs attention (#5209)

failing_services filtered on `(service_trouble(s) or 9) <= 2`; a crash loop
ranks 0, which is falsy, so the worst kind of trouble was left out. Test the
rank against None. The page test's task error also gains the age_s the
_swarm_failures include reads.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

plugins/docker/swarm_view.py

@@ -377,4 +377,6 @@ def failing_services(services: list[dict]) -> list[dict]:
     """The services that belong in Needs attention: a crash loop, or short of
     their desired replicas. A healthy service whose failed tasks Swarm has
     already replaced is history, shown on the service, not a problem now."""
-    return [s for s in services_problems_first(services) if (service_trouble(s) or 9) <= 2]
+    # A crash loop ranks 0, so test the rank against None, not for truth.
+    return [s for s in services_problems_first(services)
+            if (t := service_trouble(s)) is not None and t <= 2]