fix(09): WR-06 default a relation list to its first sortable column

modules/cabana/relation.go

@@ -544,10 +544,17 @@ func normalizeRelationQuery(schema *RelationSchema, candidates bool, in Relation
 		panel = schema.Manage
 	}
 	sortKey := in.Sort
-	if sortKey == "" && len(panel.List.Columns) > 0 {
-		sortKey = panel.List.Columns[0].Key
-	}
-	if sortKey != "" {
+	if sortKey == "" {
+		// No explicit sort: use the first sortable column, or none (the
+		// primary key then orders the page). Only a sort the client names is
+		// validated, so a panel whose first column is not sortable still loads.
+		for _, col := range panel.List.Columns {
+			if col.Sortable {
+				sortKey = col.Key
+				break
+			}
+		}
+	} else {
 		valid := false
 		for _, col := range panel.List.Columns {
 			if col.Key == sortKey && col.Sortable {