🩹 Make preferred_username optional

src/routes/login/callback/updateUser.ts

@@ -20,12 +20,15 @@ export async function updateUser(params: {
 		sub: hfUserId,
 	} = z
 		.object({
-			preferred_username: z.string(),
+			preferred_username: z.string().optional(),
 			name: z.string(),
 			picture: z.string(),
 			sub: z.string(),
 			email: z.string().email().optional(),
 		})
+		.refine((data) => data.preferred_username || data.email, {
+			message: "Either preferred_username or email must be provided by the provider.",
+		})
 		.parse(userData);
 
 	const existingUser = await collections.users.findOne({ hfUserId });