web: centralize prop fetching for live + preview, fix preview banner breakage

web/src/app/utleie/page.tsx

@@ -1,42 +1,19 @@
 import { Metadata, ResolvingMetadata } from "next";
-import { VenueFragment, VenueRentalIndexFragment } from "@/gql/graphql";
-import { getClient } from "@/app/client";
 import {
   VenueRentalIndexView,
-  venueRentalIndexQuery,
+  loadVenueRentalIndexProps,
 } from "@/components/venues/VenueRentalIndexView";
 import { getSeoMetadata } from "@/lib/seo";
 
 export async function generateMetadata(
-  { params }: { params: Promise<{}> },
+  _: unknown,
   parent: ResolvingMetadata
 ): Promise<Metadata | null> {
-  const { data, error } = await getClient().query(venueRentalIndexQuery, {});
-
-  if (error) {
-    throw new Error(error.message);
-  }
-  if (!data?.index) {
-    return null;
-  }
-
-  const index = data.index as VenueRentalIndexFragment;
-  const metadata = await getSeoMetadata(index, parent);
-  return metadata;
+  const { index } = await loadVenueRentalIndexProps();
+  return getSeoMetadata(index, parent);
 }
 
 export default async function Page() {
-  const { data, error } = await getClient().query(venueRentalIndexQuery, {});
-
-  if (error) {
-    throw new Error(error.message);
-  }
-  if (!data?.index || !data?.venues) {
-    throw new Error("Failed to render /utleie");
-  }
-
-  const index = data.index as VenueRentalIndexFragment;
-  const venues = (data?.venues ?? []) as VenueFragment[];
-
-  return <VenueRentalIndexView index={index} venues={venues} />;
+  const props = await loadVenueRentalIndexProps();
+  return <VenueRentalIndexView {...props} />;
 }