Harden form auth and submission handling

proxy.ts

@@ -1,7 +1,6 @@
 import { NextResponse } from "next/server";
-import type { NextRequest } from "next/server";
 
-export function proxy(request: NextRequest) {
+export function proxy() {
   // All /form routes are allowed through — auth is handled via dialog in the layout
   return NextResponse.next();
 }