fix(webapp): stop login.magic client module crash breaking SSO redirect

The top-level createCookie call read env.NODE_ENV from ~/env.server, which
is undefined in the client bundle, so importing the route module threw. When
the inline /login email form submits (a navigation to /login/magic), Remix
loads that module, the import fails, and it hard-reloads /login instead of
following the action's redirect to /login/sso. Move the cookie into a
.server module so it never evaluates on the client.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: samejr

apps/webapp/app/routes/login.magic/magicLinkEmailCookie.server.ts

@@ -0,0 +1,15 @@
+import { createCookie } from "@remix-run/node";
+import { env } from "~/env.server";
+
+// Carries the submitted email to the confirmation screen in a short-lived,
+// httpOnly cookie rather than the URL, so the address never lands in access
+// logs, browser history, or error-tracker breadcrumbs. Lives in a .server
+// module: it calls createCookie at import time using server-only env, which
+// throws if it ever evaluates in the client bundle.
+export const magicLinkEmailCookie = createCookie("magiclink-email", {
+  maxAge: 60 * 10,
+  httpOnly: true,
+  sameSite: "lax",
+  secure: env.NODE_ENV === "production",
+  path: "/",
+});

apps/webapp/app/routes/login.magic/route.tsx

@@ -1,7 +1,6 @@
 import { ArrowLeftIcon } from "@heroicons/react/20/solid";
 import { InboxArrowDownIcon } from "@heroicons/react/24/solid";
 import {
-  createCookie,
   redirect,
   type ActionFunctionArgs,
   type LoaderFunctionArgs,
@@ -35,17 +34,7 @@ import { ssoRedirectForEmail } from "~/services/ssoAutoDiscovery.server";
 import { logger, tryCatch } from "@trigger.dev/core/v3";
 import { env } from "~/env.server";
 import { extractClientIp } from "~/utils/extractClientIp.server";
-
-// The submitted email is carried to the confirmation screen in a short-lived,
-// httpOnly cookie rather than the URL, so the address never lands in access
-// logs, browser history, or error-tracker breadcrumbs.
-const magicLinkEmailCookie = createCookie("magiclink-email", {
-  maxAge: 60 * 10,
-  httpOnly: true,
-  sameSite: "lax",
-  secure: env.NODE_ENV === "production",
-  path: "/",
-});
+import { magicLinkEmailCookie } from "./magicLinkEmailCookie.server";
 
 export const meta: MetaFunction = ({ matches }) => {
   const parentMeta = matches