feat(hk): expand search and add operational user overview

src/lib/admin-search-request.ts

@@ -0,0 +1,20 @@
+/** Owns the single request allowed to update a search dialog. */
+export class AdminSearchRequest {
+	private current: AbortController | null = null;
+
+	cancel() {
+		this.current?.abort();
+		this.current = null;
+	}
+
+	start() {
+		this.cancel();
+		const controller = new AbortController();
+		this.current = controller;
+		return controller;
+	}
+
+	accepts(controller: AbortController) {
+		return this.current === controller && !controller.signal.aborted;
+	}
+}