feat: add dashboard layout with navigation and auth guard

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/lib/api/auth.remote.ts

@@ -0,0 +1,29 @@
+import { redirect } from '@sveltejs/kit';
+import { form, getRequestEvent, query } from '$app/server';
+import { auth } from '$lib/server/auth';
+import { signupSchema, loginSchema } from '$lib/schema/auth';
+
+export const signup = form(signupSchema, async (user) => {
+	await auth.api.signUpEmail({ body: user });
+	redirect(307, '/dashboard');
+});
+
+export const login = form(loginSchema, async (user) => {
+	const { request } = getRequestEvent();
+	await auth.api.signInEmail({ body: user, headers: request.headers });
+	redirect(303, '/dashboard');
+});
+
+export const signout = form(async () => {
+	const { request } = getRequestEvent();
+	await auth.api.signOut({ headers: request.headers });
+	redirect(303, '/login');
+});
+
+export const getUser = query(async () => {
+	const { locals } = getRequestEvent();
+	if (!locals.user) {
+		redirect(307, '/login');
+	}
+	return locals.user;
+});