Miscellaneous improvements

- Allow external components to have reactions.
- Introduce handlesDefaultReactionsInternally to better handle external reactivity for nodes with custom properties.

lib/src/api/mixins.dart

@@ -737,7 +737,13 @@ mixin CornerMixin on BaseNode {
 }
 
 /// Indicates that the node has some custom properties.
-mixin CustomPropertiesMixin on BaseNode {}
+mixin CustomPropertiesMixin on BaseNode {
+  /// Whether the node with custom properties handles its default reactions
+  /// like click, long press, etc. internally. If this is true then the
+  /// node itself is responsible for handling its own reactions. Otherwise,
+  /// the transformer will provide for the default reactions.
+  bool get handlesDefaultReactionsInternally => true;
+}
 
 /// Defines node that preserves its aspect ratio and cannot be resized by only
 /// its width or height.

lib/src/api/nodes/external_component_node.dart

@@ -9,7 +9,7 @@ part 'external_component_node.g.dart';
 /// An inert node that does nothing.
 /// This is populated dynamically through the Codelessly SDK.
 @JsonSerializable()
-class ExternalComponentNode extends BaseNode with CustomPropertiesMixin {
+class ExternalComponentNode extends SceneNode with CustomPropertiesMixin {
   @override
   final String type = 'external';
 
@@ -20,6 +20,9 @@ class ExternalComponentNode extends BaseNode with CustomPropertiesMixin {
   /// nodes to the same widget builder.
   String? builderID;
 
+  @override
+  bool get handlesDefaultReactionsInternally => false;
+
   /// Creates an [ExternalComponentNode] with the given data.
   ExternalComponentNode({
     required super.id,
@@ -40,12 +43,20 @@ class ExternalComponentNode extends BaseNode with CustomPropertiesMixin {
     super.edgePins,
     super.aspectRatioLock,
     super.positioningMode,
+    super.parentID,
+    super.reactions,
+    super.variables,
+    super.multipleVariables,
   });
 
   /// Creates a [ExternalComponentNode] from a JSON object.
   factory ExternalComponentNode.fromJson(Map json) =>
       _$ExternalComponentNodeFromJson(json);
 
+  @override
+  List<TriggerType> get triggerTypes =>
+      [TriggerType.click, TriggerType.longPress];
+
   @override
   Map toJson() => _$ExternalComponentNodeToJson(this);
 }