React login and signup section components

Autocomplete attributes are not optional polish. Put autocomplete="username" or "email" on the identifier field, autocomplete="current-password" on a login password, and autocomplete="new-password" on registration and reset forms. Set type="email" so mobile keyboards show the right layout, and give every input a name and an id that its label points at. Without these, browsers and password managers guess, and they guess wrong often enough that people give up and reset their password instead.

Password managers break on custom inputs for predictable reasons. They look for a real input element inside a real form element, so anything built out of contenteditable divs, split single-character boxes, or fields that only mount after an animation finishes will confuse them. Never block paste, and never strip characters on input, because both behaviours specifically punish the people using generated passwords. If you add a show-password toggle, swap the type attribute on the same node rather than swapping in a different element, otherwise the manager loses track of the field.

Error handling on a login form has a security dimension the rest of your forms do not. Say "that email or password is not right" rather than confirming an account exists, since a message that distinguishes the two lets anyone enumerate your user list. Keep the email field populated after a failure, put the message in an aria-live region so it is announced, and do not clear a wrong password silently with no explanation. Rate limit attempts server side and be explicit when you lock someone out, including when they can try again.

The decorative half of a split-screen layout must never gate the form. The shader panel in one of these blocks is a real WebGL canvas, so lazy load it, render the form first in the DOM, and make sure a failed context creation leaves a plain background instead of a blank page. Someone hitting your login page is usually trying to get back into something urgently, and a two second animation between them and a password field is a cost with no return. On the OAuth buttons, keep the order stable across visits and mark which provider was used last, because people forget which one they signed up with.