TELBC/DocsMan ? reverse-engineered prompt

Build me a simple school document manager app where users can log in, create folders, and organize text or markdown documents inside those folders.

I want the app to let me add new folders from a sidebar, create documents and assign them to a folder, then open a folder from the home view to see and edit the documents inside. Please include tags for documents, where a document can have one or more tags and tags belong to a category. Users should also be able to share documents with other users they have as friends, and there should be an owner concept that can affect how folders and documents are managed and shared.

Make it feel complete and usable, with a clean login flow, basic document editing, and the important rule that a document has to be linked to a folder before it can be saved. If you need anything unclear, look up the current docs online and make reasonable choices.