Fix compilation errors from optional checkboxState

Co-authored-by: alexr00 <38270282+alexr00@users.noreply.github.com>

Author: Copilot

src/view/treeNodes/directoryTreeNode.ts

@@ -124,7 +124,7 @@ export class DirectoryTreeNode extends TreeNode implements vscode.TreeItem {
 				if (!child.allChildrenViewed()) {
 					return false;
 				}
-			} else if (child.checkboxState.state !== vscode.TreeItemCheckboxState.Checked) {
+			} else if (!child.checkboxState || child.checkboxState.state !== vscode.TreeItemCheckboxState.Checked) {
 				return false;
 			}
 		}

src/view/treeNodes/treeUtils.ts

@@ -35,9 +35,9 @@ export namespace TreeUtils {
 					continue;
 				}
 				if (!checkedNodes.includes(selected) && !uncheckedNodes.includes(selected)) {
-					if (selected.checkboxState.state === vscode.TreeItemCheckboxState.Unchecked) {
+					if (selected.checkboxState?.state === vscode.TreeItemCheckboxState.Unchecked) {
 						checkedNodes.push(selected);
-					} else {
+					} else if (selected.checkboxState?.state === vscode.TreeItemCheckboxState.Checked) {
 						uncheckedNodes.push(selected);
 					}
 				}