Polish public error and 404 screens with brand atmosphere.

Shared ErrorScreen composition, i18n for en/nl/it, Sentry on route errors, and a self-contained global-error fallback that matches the hotel gold theme.

Co-authored-by: Cursor <[email protected]>

src/components/error-screen.tsx

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+import type { ReactNode } from "react";
+
+/**
+ * Shared public error / empty-route composition.
+ * Used by route error.tsx and not-found.tsx (inside the app shell).
+ */
+export function ErrorScreen({
+	code,
+	title,
+	subtitle,
+	body,
+	actions,
+	footer,
+}: {
+	code: string;
+	title: string;
+	subtitle: string;
+	body: string;
+	actions: ReactNode;
+	footer?: ReactNode;
+}) {
+	return (
+		<main className="error-screen">
+			<div className="error-screen-glow" aria-hidden />
+			<section className="error-screen-panel" aria-labelledby="error-screen-title">
+				<p className="error-screen-code">{code}</p>
+				<h1 id="error-screen-title" className="error-screen-title">
+					{title}
+				</h1>
+				<p className="error-screen-subtitle">{subtitle}</p>
+				<p className="error-screen-body">{body}</p>
+				<div className="error-screen-actions">{actions}</div>
+				{footer ? <div className="error-screen-footer">{footer}</div> : null}
+			</section>
+		</main>
+	);
+}