fix: handle duplicate email sign-up and null user in protected layout

- Register action now returns success instead of redirecting to /account/setup
  so users without a session (duplicate email with requireEmailVerification)
  see a 'check your email' message instead of crashing
- Protected layout guards against null/undefined locals.user before querying
  Prisma (was passing id: undefined)
- Updated register page to show success banner with verification instructions
- Updated test to match new action response

src/routes/(protected)/+layout.server.ts

@@ -3,8 +3,12 @@ import { error, redirect } from '@sveltejs/kit';
 import { prisma } from '$lib/db';
 
 export const load: LayoutServerLoad = async ({ locals }) => {
+	if (!locals.user?.id) {
+		throw error(403, 'not authorized');
+	}
+
 	const user = await prisma.user.findUnique({
-		where: { id: locals.user?.id },
+		where: { id: locals.user.id },
 		select: { id: true, roleId: true, profile: { select: { id: true } } }
 	});
 	if (!user) {

src/routes/register/+page.server.ts

@@ -1,6 +1,6 @@
 import type { Actions } from './$types';
 import { auth } from '$lib/auth';
-import { fail, isRedirect, redirect } from '@sveltejs/kit';
+import { fail } from '@sveltejs/kit';
 
 export const actions: Actions = {
 	default: async ({ request }) => {
@@ -17,7 +17,7 @@ export const actions: Actions = {
 		}
 
 		try {
-			const response = await auth.api.signUpEmail({
+			await auth.api.signUpEmail({
 				body: {
 					name: `${firstName} ${lastName}`,
 					email: email,
@@ -25,11 +25,8 @@ export const actions: Actions = {
 				}
 			});
 
-			if (response.user) {
-				throw redirect(303, '/account/setup');
-			}
+			return { success: true };
 		} catch (err) {
-			if (isRedirect(err)) throw err;
 			const message = err instanceof Error ? err.message : 'An unexpected error occurred';
 			return fail(400, { error: message });
 		}

src/routes/register/+page.svelte

@@ -8,7 +8,17 @@
 
 <Window>
 	<div class="flex flex-col items-start justify-center">
-		{#if form?.error}
+		{#if form?.success}
+			<div
+				class="mb-4 w-full rounded-lg border border-green-200 bg-green-50 p-4 text-green-700"
+			>
+				<p class="font-medium">Account created!</p>
+				<p class="mt-1 text-sm">
+					We've sent a verification email. Check your inbox and click the link to verify your
+					email address, then log in.
+				</p>
+			</div>
+		{:else if form?.error}
 			<div class="mb-4 w-full rounded-lg border border-red-200 bg-red-50 p-3 text-red-700">
 				{form.error}
 			</div>

src/routes/register/page.server.spec.ts

@@ -41,7 +41,7 @@ describe('register page server action', () => {
 		expect(signUpEmail).not.toHaveBeenCalled();
 	});
 
-	it('redirects to /account/setup on successful signup', async () => {
+	it('returns success on successful signup', async () => {
 		signUpEmail.mockResolvedValue({ user: { id: 'user-1' } });
 
 		const request = createFormRequest({
@@ -52,9 +52,8 @@ describe('register page server action', () => {
 			password2: 'secret123'
 		});
 
-		await expect(actions.default({ request } as any)).rejects.toMatchObject({
-			status: 303
-		});
+		const result = await invokeDefault(request);
+		expect(result).toEqual({ success: true });
 	});
 
 	it('returns fail(400) when signUpEmail throws', async () => {