added footer links, added email alias check

apps/hub/app/(auth)/register/action.ts

@@ -2,10 +2,7 @@
 import { prisma, Prisma } from "@repo/db";
 import bcrypt from "bcryptjs";
 
-export const register = async ({
-	password,
-	...user
-}: Omit<Prisma.UserCreateInput, "publicId">) => {
+export const register = async ({ password, ...user }: Omit<Prisma.UserCreateInput, "publicId">) => {
 	const hashedPassword = await bcrypt.hash(password, 12);
 	const lastUserPublicId = await prisma.user.findFirst({
 		select: {
@@ -21,6 +18,18 @@ export const register = async ({
 		varPublicId = `VAR${(lastUserInt + 1).toString().padStart(4, "0")}`;
 	}
 
+	const existingUser = await prisma.user.findFirst({
+		where: {
+			email: user.email,
+		},
+		select: {
+			id: true,
+		},
+	});
+	if (existingUser) {
+		throw new Error("Ein Nutzer mit dieser E-Mail-Adresse existiert bereits.");
+	}
+
 	const newUser = prisma.user.create({
 		data: {
 			...user,