fixed authcontext for sign up, added 404 and middleware for prod readiness

middleware.ts

@@ -0,0 +1,38 @@
+// middleware.ts
+import { NextResponse } from "next/server";
+import type { NextRequest } from "next/server";
+
+const LAUNCH_ONLY_ROOT = process.env.NEXT_PUBLIC_LAUNCH_ONLY_ROOT === "true";
+
+// Allow only root + essential static files
+const ALLOW = new Set([
+  "/",
+  "/favicon.ico",
+  "/robots.txt",
+  "/sitemap.xml",
+]);
+
+export function middleware(req: NextRequest) {
+  if (!LAUNCH_ONLY_ROOT) return NextResponse.next();
+
+  const { pathname } = req.nextUrl;
+
+  // Always allow Next internals + static assets
+  if (
+    pathname.startsWith("/_next") ||
+    pathname.startsWith("/assets") ||
+    pathname.startsWith("/images")
+  ) {
+    return NextResponse.next();
+  }
+
+  // Allow the root + a few public files
+  if (ALLOW.has(pathname)) return NextResponse.next();
+
+  // Everything else: hide it
+  return NextResponse.rewrite(new URL("/404", req.url)); // or redirect to "/"
+}
+
+export const config = {
+  matcher: ["/:path*"],
+};