Require confirmation and block deleting library actions still referenced by node groups.

service/internal/settings/node_action_groups.go

@@ -128,6 +128,23 @@ func GroupsForNode(store NodeActionGroupStore, nodeID string) []NodeActionGroup
 	return result
 }
 
+// LibraryActionInUse reports whether any group item still references actionID as a library source.
+// Local clones (source local) do not count even if they previously came from that action.
+func LibraryActionInUse(store NodeActionGroupStore, actionID string) bool {
+	actionID = strings.TrimSpace(actionID)
+	if actionID == "" {
+		return false
+	}
+	for _, group := range store.Groups {
+		for _, item := range group.Items {
+			if item.Source == ActionItemSourceLibrary && item.LibraryActionID == actionID {
+				return true
+			}
+		}
+	}
+	return false
+}
+
 // UpdateGroupLastRunAt sets LastRunAt and UpdatedAt for a group and saves.
 func UpdateGroupLastRunAt(dir string, groupID string, at time.Time) error {
 	store, err := LoadNodeActionGroupsOrEmpty(dir)