Fix nodes disappearing after closing a node with an ancestor sibling

[paolosimone]

Refactored the logic in the TreeState.close method to use a new helper function, findNextSibling, for determining the next node after closing. This makes the sibling-finding logic more robust by walking up the parent chain until a sibling is found, rather than just checking immediate siblings or parent siblings.

[Copilot]

Pull Request Overview

This PR fixes a bug where nodes were disappearing after closing a node with an ancestor sibling by improving the sibling-finding logic in the TreeState.close method. The fix introduces a more robust approach that traverses up the parent chain to find the next appropriate sibling node.

• Replaced inline sibling-finding logic with a dedicated helper function findNextSibling
• Updated test data to use array values instead of primitive values in the object_array structure

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
extension/src/viewer/components/TreeViewer/Tree/TreeState.ts	Added findNextSibling helper function and refactored the close method to use it for more robust sibling detection
samples/test.json	Updated test data structure to use arrays as values in object_array entries

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