[EverSteem] Implementing Tree Node

It seems not easy to implement tree node like one in Obsidian.

This is a screenshot of Obsidian tree node:

I am doing my best to add similar features as much as possible.

Just for your information, this is a flutter web app and use this package to implement this tree node:

https://pub.dev/packages/flutter_fancy_tree_view

cc.
@steemcurator01

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