feat:add registration management with token-based access

Add management tokens to registrations allowing users to view, edit, and
cancel their registration via a unique URL. Implement email
notifications
for confirmations, updates, and cancellations using nodemailer. Simplify
art forms grid from 6 to 4 items and remove trajectory links. Translate
footer links to Dutch and fix matzah spelling in info section.

apps/web/src/components/homepage/Footer.tsx

@@ -31,14 +31,14 @@ export default function Footer() {
 						href="/privacy"
 						className="link-hover transition-colors hover:text-white"
 					>
-						Privacy Policy
+						Privacy Beleid
 					</a>
 					<span className="text-white/40">|</span>
 					<a
 						href="/terms"
 						className="link-hover transition-colors hover:text-white"
 					>
-						Terms of Service
+						Algemene Voorwaarden
 					</a>
 					<span className="text-white/40">|</span>
 					<a
@@ -64,7 +64,12 @@ export default function Footer() {
 					© {new Date().getFullYear()} Kunstenkamp. Alle rechten voorbehouden.
 				</div>
 				<div className="text-white/50 text-xs transition-colors hover:text-white">
-					<a href="https://zias.be" className="link-hover">
+					<a
+						href="https://zias.be"
+						target="_blank"
+						rel="noopener noreferrer"
+						className="link-hover"
+					>
 						Gemaakt met ♥ door zias.be
 					</a>
 				</div>