Add the Workshops page and keep each sign-up on the site.

The form is built once to the settled field set, and a valid send is saved before anyone is emailed.

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

lib/server/workshopSignupDraft.ts

@@ -0,0 +1,45 @@
+import { NextResponse } from "next/server";
+import {
+  EMPTY_WORKSHOP_FORM_VALUES,
+  type WorkshopFieldErrors,
+  type WorkshopFormValues,
+} from "../workshopSignup";
+
+export const WORKSHOP_SIGNUP_DRAFT_COOKIE = "workshop_signup_draft";
+
+export interface WorkshopSignupDraft {
+  values: WorkshopFormValues;
+  fieldErrors: WorkshopFieldErrors;
+}
+
+export function encodeWorkshopSignupDraft(draft: WorkshopSignupDraft): string {
+  return Buffer.from(JSON.stringify(draft), "utf8").toString("base64url");
+}
+
+export function decodeWorkshopSignupDraft(raw: string | undefined): WorkshopSignupDraft | null {
+  if (!raw) return null;
+  try {
+    const parsed = JSON.parse(Buffer.from(raw, "base64url").toString("utf8")) as Partial<WorkshopSignupDraft>;
+    if (!parsed.values || typeof parsed.values !== "object") return null;
+    return {
+      values: { ...EMPTY_WORKSHOP_FORM_VALUES, ...parsed.values },
+      fieldErrors: parsed.fieldErrors ?? {},
+    };
+  } catch {
+    return null;
+  }
+}
+
+export function attachWorkshopSignupDraft(
+  response: NextResponse,
+  draft: WorkshopSignupDraft,
+): NextResponse {
+  response.cookies.set(WORKSHOP_SIGNUP_DRAFT_COOKIE, encodeWorkshopSignupDraft(draft), {
+    httpOnly: true,
+    sameSite: "lax",
+    secure: process.env.NODE_ENV === "production",
+    path: "/workshops",
+    maxAge: 60 * 15,
+  });
+  return response;
+}