sasmit-1/ProjectEnclave ? reverse-engineered prompt

Build me a secure cloud storage vault app where people can sign up, log in, create folders, upload big files, and download them from a clean dark dashboard.

I want the files to stream instead of loading into memory, and I want uploads to be encrypted on the fly so the server never keeps plain files around. When someone downloads a file, it should decrypt only if the file has not been tampered with, and if the data looks altered, the download should fail immediately. Please also add a basic defense system that watches for suspicious rapid download behavior and cuts off obvious mass extraction attempts.

Use a modern React frontend with a sleek AMOLED black look, and a Node and Express backend with MongoDB for users and file metadata. If you need to check current library docs or best practices, go ahead and look them up online. Include a simple visual animation on the upload screen so the app feels polished and security focused.