feat(registration): update event date and add required guest fields

Change event date from April 18 to April 24 across all pages and emails.
Add birthdate and postcode as required fields for guest registration.
Update API to support multiple registrations per user. Enhance admin
panel with expandable guest details view.

packages/api/src/email.ts

@@ -86,7 +86,7 @@ function registrationConfirmationHtml(params: {
                 Hoi ${params.firstName},
               </p>
               <p style="margin:0 0 16px;font-size:16px;color:rgba(255,255,255,0.85);line-height:1.6;">
-                We hebben je inschrijving voor <strong style="color:#ffffff;">Open Mic Night — vrijdag 18 april 2026</strong> in goede orde ontvangen.
+                We hebben je inschrijving voor <strong style="color:#ffffff;">Open Mic Night — vrijdag 24 april 2026</strong> in goede orde ontvangen.
               </p>
               <!-- Registration summary -->
               <table width="100%" cellpadding="0" cellspacing="0" style="background:rgba(255,255,255,0.08);border-radius:4px;margin:24px 0;">

packages/api/src/routers/index.ts

@@ -36,6 +36,8 @@ function parseGuestsJson(raw: string | null): Array<{
 	lastName: string;
 	email?: string;
 	phone?: string;
+	birthdate?: string;
+	postcode?: string;
 }> {
 	if (!raw) return [];
 	try {
@@ -218,6 +220,8 @@ const guestSchema = z.object({
 	lastName: z.string().min(1),
 	email: z.string().email().optional().or(z.literal("")),
 	phone: z.string().optional(),
+	birthdate: z.string().min(1),
+	postcode: z.string().min(1),
 });
 
 const coreRegistrationFields = {
@@ -542,7 +546,7 @@ export const appRouter = {
 			const guestSummary = guests
 				.map(
 					(g) =>
-						`${g.firstName} ${g.lastName}${g.email ? ` <${g.email}>` : ""}${g.phone ? ` (${g.phone})` : ""}`,
+						`${g.firstName} ${g.lastName}${g.birthdate ? ` (${g.birthdate})` : ""}${g.postcode ? ` [${g.postcode}]` : ""}${g.email ? ` <${g.email}>` : ""}${g.phone ? ` (${g.phone})` : ""}`,
 				)
 				.join(" | ");
 			return [
@@ -593,7 +597,7 @@ export const appRouter = {
 		return result;
 	}),
 
-	getMyRegistration: protectedProcedure.handler(async ({ context }) => {
+	getMyRegistrations: protectedProcedure.handler(async ({ context }) => {
 		const email = context.session.user.email;
 
 		const rows = await db
@@ -602,16 +606,12 @@ export const appRouter = {
 			.where(
 				and(eq(registration.email, email), isNull(registration.cancelledAt)),
 			)
-			.orderBy(desc(registration.createdAt))
-			.limit(1);
+			.orderBy(desc(registration.createdAt));
 
-		const row = rows[0];
-		if (!row) return null;
-
-		return {
+		return rows.map((row) => ({
 			...row,
 			guests: parseGuestsJson(row.guests),
-		};
+		}));
 	}),
 
 	// ---------------------------------------------------------------------------