fix: don't refresh search preview data (#1276)

The default of swr is to refresh the data on screen activation, network
reconnect etc. This is not needed for the search preview data as the
data is very unlikely to change within one user session, generating
needless requests that return the same data.

See
https://swr.vercel.app/docs/revalidation#disable-automatic-revalidations

src/search/preview/data.ts

@@ -1,7 +1,7 @@
 /* eslint-disable lingui/no-unlocalized-strings */
 import { CountryDomain } from "@/user/views/user/search/types";
 import { buildAdServerEndpoint } from "@/util/environment";
-import useSWR from "swr";
+import useSWRImmutable from "swr/immutable";
 
 /* this is the data we get back from the server */
 interface ServerSearchData {
@@ -57,7 +57,7 @@ const fetcher = (suffix: string) =>
 export function useLandingPageData(
   slug: string,
 ): UseSearchDataReturn<SearchData> {
-  const { data, isLoading } = useSWR<ServerSearchData>(slug, fetcher);
+  const { data, isLoading } = useSWRImmutable<ServerSearchData>(slug, fetcher);
 
   if (!data) {
     return { loading: isLoading };
@@ -80,7 +80,7 @@ export function useKeywordData(
   landingPageUrl: string,
 ): UseSearchDataReturn<string[]> {
   const qs = new URLSearchParams({ url: landingPageUrl });
-  const { data, isLoading } = useSWR<string[]>(
+  const { data, isLoading } = useSWRImmutable<string[]>(
     `${slug}/keywords?${qs}`,
     fetcher,
   );