[auth] Implement login via username

[adityapawar1]

What's new in this PR

• Changes the signup screen to include username, first name, last name, email, and password with input validation for username and email.
• Uses a database trigger to add user metadata to the profiles table
• Adds some basic styling to the sign up and log in page

Relevant Links

https://supabase.com/docs/guides/database/postgres/triggers
https://github.com/orgs/supabase/discussions/8383

Notion Sprint Task

Sprint task

Online sources

Related PRs

How to review

• Go to the sign up page
  • Try entering an invalid username and an already taken username to make sure both throw an error.
  • Enter an invalid email to make sure an error is shown on the screen
  • Create a new account and continue with the onboarding process
• Log out, and try logging in again with your new account
• Log out, try entering a username that does not exist
• Try entering a username that does exist with a wrong password

Next steps

None

Tests Performed, Edge Cases

See "How to Review"

Screenshots

@akshaynthakur

[akshaynthakur]

Great work! My comments are mainly styling nits (styling wasn't originally in scope but I'm excited to see you doing it!)

Outstanding items:

• Ensure that sign up can only happen if account doesn't already exist for email
• Double check that usernames are being added to the profiles table when new users sign up

[adityapawar1]

I finished the rest of the review changes but I needed some help moving the login/sign up button to the bottom of the page and toggling seeing the password. @akshaynthakur

[akshaynthakur]

Good work on the styling! Lot of small nits to fix, but overall things are looking nice.

[akshaynthakur]

Great work! Couple small changes and this should be ready to merge!

Also, just checked with Brenda and she said that the text inputs on the sign up screen should also have labels above them, she just forgot to update the designs. Make sure to update those inputs!

[adityapawar1]

I think merging this also lets us merge #42 ?

[akshaynthakur]

INCREDIBLE job on this massive PR! Big congrats on it finally being merged