refactor: auth login

[anqilique]

Description

Fixed the issue with new users signing up. Previously, the required faculty was preventing signup.

Changes

• AuthProvider.tsx refactored slightly. Clears the user when logging out, uses the loading state consistently.
• user.ts model no longer requires university, studentID, UPI, yearOfStudy, or faculties.
• userValidation.ts only requires faculty if the user goes some university.

[RLee64]

doesn't seem to actually work?

[anqilique]

doesn't seem to actually work?

Think I've fixed it now. Did double check the required values in userValidation.ts, but the main issue seemed to be the database indexes. Those were still checking for unique studentID and upi values, even when they were undefined/nothing. I've changed those to be sparse, but still unique (so that if people do provide studentID, it can't be the same).

Also updated the schema to reflect this, but changing the schema doesn't actually change the indexes (which had to be done manually inside Compass).

I was able to create several accounts now with "None" university, so that should fix the duplicate ID/upi issue. 🙏