Feature Request: Solution Explorer

What do u think about adding solution explorer to the tool? For example: we are working on some dungeon, creating "folder" called Utgarde Keep and inside of that we are loading SAI from bosses and we can just jump to that sai if we want to. And it could be saved in .json

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No files, tests, or entry points are mentioned. Clarify the solution-explorer hierarchy, how SAI entries should be located and opened, and the .json persistence format; done should include navigation to saved SAI entries and reliable project persistence.

Written by the indexing model from the issue text.