feat: public events/polls, friends graph, captcha, SSE hardening, and admin UX

Ship product gaps: register/vote pages, friend add/accept/decline/remove, email verify TTL, captcha on login/forgot, soft-fail user actions, SSE abort/shared client, Commando Centrum error toasts, admin delete for events/polls, and IT/NL i18n fills.

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

src/app/(site)/error.tsx

@@ -0,0 +1,59 @@
+"use client";
+
+import * as Sentry from "@sentry/nextjs";
+import { Home, RefreshCw } from "lucide-react";
+import Link from "next/link";
+import { useTranslations } from "next-intl";
+import { useEffect } from "react";
+import { ErrorScreen } from "@/components/error-screen";
+
+/**
+ * Site route-segment error boundary. Renders inside the site shell layout.
+ * Never shows the raw error to the user.
+ */
+export default function SiteErrorPage({
+	error,
+	reset,
+}: {
+	error: Error & { digest?: string };
+	reset: () => void;
+}) {
+	const t = useTranslations("pages.error");
+
+	useEffect(() => {
+		console.error(error);
+		Sentry.captureException(error);
+	}, [error]);
+
+	return (
+		<ErrorScreen
+			code={t("code")}
+			title={t("title")}
+			subtitle={t("subtitle")}
+			body={t("body")}
+			actions={
+				<>
+					<button
+						type="button"
+						className="btn btn-primary"
+						onClick={() => reset()}
+					>
+						<RefreshCw className="error-screen-btn-icon" aria-hidden />
+						{t("tryAgain")}
+					</button>
+					<Link className="btn btn-outline" href="/">
+						<Home className="error-screen-btn-icon" aria-hidden />
+						{t("backHome")}
+					</Link>
+				</>
+			}
+			footer={
+				error.digest ? (
+					<p className="error-screen-digest">
+						{t("reference", { digest: error.digest })}
+					</p>
+				) : null
+			}
+		/>
+	);
+}