feat: add icon property to workflow node specifications and update related components

internal/builders/ai_workflow_builder.go

@@ -76,6 +76,7 @@ func BuildAIWorkflowNodeSpecs(list []workflowregistry.NodeSpec) []response.AIWor
 			Type:                            item.Type,
 			Title:                           item.Title,
 			Description:                     item.Description,
+			Icon:                            item.Icon,
 			RiskLevel:                       item.RiskLevel,
 			Interruptible:                   item.Interruptible,
 			RequiresConfirmationPredecessor: item.RequiresConfirmationPredecessor,

internal/builders/ai_workflow_builder_test.go

@@ -19,6 +19,9 @@ func TestBuildAIWorkflowNodeSpecsIncludesVariableContracts(t *testing.T) {
 		switch spec.Type {
 		case workflowregistry.NodeTypeStart:
 			startFound = true
+			if spec.Icon != "PlayCircleIcon" {
+				t.Fatalf("expected start icon PlayCircleIcon, got %q", spec.Icon)
+			}
 			if !hasResponseVariable(spec.OutputSchema, "userMessage") {
 				t.Fatalf("expected start output userMessage, got %#v", spec.OutputSchema)
 			}