If OAuth fails, redirect to a useful error page

[nerdalert]

Currently the token on ui SaaS has expired and it redirects to a 404. You can replicate the behavior by putting in a bogus Github token in the .env.

Here are client logs:

GET http://localhost:3000/error?error=AccessDenied 404 (Not Found)Understand this errorAI
Navigated to http://localhost:3000/error?error=AccessDenied

Here are server logs:

2025-01-03T21:53:14.104Z error: Error fetching GitHub organization membership for user nerdalert: Request failed with status code 401
 GET /api/auth/callback/github?code=xxxxxxxxxx&state=S-nZhFRwRPIH94q1uuS5Q 302 in 979ms
 GET /api/auth/error?error=AccessDenied 302 in 7ms
 GET /error?error=AccessDenied 404 in 19ms