feat(FN-2552): distinguish workflow failed dots in task progress

- Add a workflow-failed dot modifier class for failed workflow checks in TaskCard
- Apply ws-warning styling to workflow-origin failed steps while keeping regular failed steps unchanged
- Update TaskCard rendering logic to append the workflow-failed class only for workflow failed items
- Expand TaskCard tests to verify class assignment for regular failed, workflow failed, done, and pending dots

packages/dashboard/app/components/TaskCard.css

@@ -568,6 +568,10 @@
   background: var(--color-error-dark);
 }
 
+.card-step-dot--workflow-failed {
+  background: var(--ws-warning);
+}
+
 .card-step-name {
   flex: 1;
   min-width: 0;