How to add Authentication and Login with your app using oAuth (Google)?

When you build a multi-user app, you want to add user Authentication. You can either support your own user registration and management system or use Google oAuth. This process is similar if you want to use Microsoft oAuth, LinkedIn or other platforms.

Add Google OAuth login to my Lovable app.

Requirements:
– Use Supabase Auth with Google provider.
– Frontend: "Sign in with Google" button (Inter font, –6 spacing, greys/blues).
– On success: store user profile in `profiles (id, email, full_name, avatar_url)`.
– Create `/login` page + redirect to `/dashboard` after sign-in.
– Handle errors + loading states with micro-animations.
– Output: working auth flow with Google login, fully styled.