Changes
- Changed Shift-F keyboard shortcut to toggle the node folding deeply rather than always unfold deeply.
- Changed node menu from 'Fold Children' to 'Toggle Folding' submenu where one level or all levels can be selected.
Bug Fixes
- Fixed application crash caused by adding parent node between a root node and a main node.
- Attempting to fix UI issue where dark mode is changed by the system, causing some icons to visually disappear.