fix: auth /social-providers endpoint ids (#115)

The `/social-providers` endpoint should return a list of the provider ids, not their names.
This was found when trying to use the microsoft endpoint and the endpoint was returning `"microsoft entraid"`, when the `AuthForm` expects it to just be `"microsoft"`.

apps/web/src/components/AuthForm.tsx

@@ -259,6 +259,7 @@ export function Auth({ setIsMagicLinkSent, isSignUp }: AuthProps) {
             }
             return (
               <Button
+                key={key}
                 onClick={() => handleLoginWithProvider(key as SocialProvider)}
                 isLoading={isLoginWithProviderPending === key}
                 iconLeft={<provider.icon />}