perf(campaign): search share targets server-side

webui/src/api/campaigns.ts

@@ -1,5 +1,9 @@
 import type { ApiSettings, CampaignListItem, DeltaDeletedItem } from "../types";
 import { apiDownload, apiFetch } from "./client";
+import {
+  apiReferenceOptionProvider,
+  type ReferenceOptionProvider
+} from "@govoplan/core-webui";
 import { campaignJobsQueryParams, type CampaignJobsQueryParameters } from "../features/campaigns/utils/jobListQuery";
 export { fetchResourceAccessExplanation } from "@govoplan/core-webui";
 export type {
@@ -1125,6 +1129,18 @@ export async function getCampaignShareTargets(settings: ApiSettings, campaignId:
   return apiFetch<CampaignShareTargets>(settings, `/api/v1/campaigns/${campaignId}/share-targets`);
 }
 
+export function campaignShareTargetProvider(
+  settings: ApiSettings,
+  campaignId: string,
+  targetType: "user" | "group"
+): ReferenceOptionProvider {
+  return apiReferenceOptionProvider(
+    settings,
+    `/api/v1/campaigns/${campaignId}/share-target-options`,
+    { target_type: targetType }
+  );
+}
+
 export async function getCampaignShares(settings: ApiSettings, campaignId: string): Promise<CampaignShare[]> {
   const pageSize = 500;
   const shares: CampaignShare[] = [];