TF-234 Implement delete a mailbox

lib/features/mailbox/presentation/model/mailbox_node.dart

@@ -135,12 +135,12 @@ extension MailboxNodeExtension on MailboxNode {
     );
   }
 
-    MailboxNode toSelectedMailboxNode({required SelectMode selectMode, ExpandMode? newExpandMode}) {
-      return MailboxNode(
-          item,
-          childrenItems: childrenItems,
-          expandMode: newExpandMode ?? expandMode,
-          selectMode: selectMode,
-      );
+  MailboxNode toSelectedMailboxNode({required SelectMode selectMode, ExpandMode? newExpandMode}) {
+    return MailboxNode(
+        item,
+        childrenItems: childrenItems,
+        expandMode: newExpandMode ?? expandMode,
+        selectMode: selectMode,
+    );
   }
 }

lib/features/mailbox/presentation/model/mailbox_tree.dart

@@ -27,6 +27,24 @@ class MailboxTree with EquatableMixin {
     return result;
   }
 
+  List<MailboxNode> getAllNodes(MailboxNode node){
+    List<MailboxNode> listOfNodes = <MailboxNode>[];
+    _addAllNodes(node, listOfNodes);
+    return listOfNodes;
+  }
+
+  void _addAllNodes(MailboxNode? node, List<MailboxNode> listOfNodes) {
+    if (node != null) {
+      listOfNodes.add(node);
+      List<MailboxNode>? childrenItems = node.childrenItems;
+      if (childrenItems != null) {
+        childrenItems.forEach((child) {
+          _addAllNodes(child, listOfNodes);
+        });
+      }
+    }
+  }
+
   @override
   List<Object?> get props => [root];
 }