refactor: remove query params for connector popup and improve connector callback URLs

surfsense_web/app/dashboard/[search_space_id]/connectors/callback/page.tsx

@@ -0,0 +1,34 @@
+"use client";
+
+import { useEffect } from "react";
+import { useRouter, useSearchParams } from "next/navigation";
+import { Spinner } from "@/components/ui/spinner";
+
+const OAUTH_RESULT_KEY = "connector_oauth_result";
+
+export default function ConnectorCallbackPage({
+	params,
+}: {
+	params: { search_space_id: string };
+}) {
+	const router = useRouter();
+	const searchParams = useSearchParams();
+
+	useEffect(() => {
+		const result = {
+			success: searchParams.get("success"),
+			error: searchParams.get("error"),
+			connector: searchParams.get("connector"),
+			connectorId: searchParams.get("connectorId"),
+		};
+
+		sessionStorage.setItem(OAUTH_RESULT_KEY, JSON.stringify(result));
+		router.replace(`/dashboard/${params.search_space_id}/new-chat`);
+	}, [searchParams, router, params.search_space_id]);
+
+	return (
+		<div className="flex items-center justify-center h-screen">
+			<Spinner size="lg" />
+		</div>
+	);
+}