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)/messages/loading.tsx

@@ -0,0 +1,15 @@
+export default function MessagesLoading() {
+	return (
+		<div
+			style={{ display: "flex", justifyContent: "center", padding: "4rem 0" }}
+		>
+			<div
+				className="animate-spin w-8 h-8 border-4 rounded-full"
+				style={{
+					borderColor: "var(--color-primary)",
+					borderTopColor: "transparent",
+				}}
+			/>
+		</div>
+	);
+}