fix: remove eslint-disable for uninstalled react-hooks plugin; remove unused clientMap (GRO-27)

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/src/pages/GroupBooking.tsx

@@ -444,7 +444,7 @@ export function GroupBookingPage() {
 
   useEffect(() => {
     loadAll();
-  }, [clientFilter]); // eslint-disable-line react-hooks/exhaustive-deps
+  }, [clientFilter]); // re-fetch when client filter changes
 
   async function cancelGroup(groupId: string) {
     if (!confirm("Cancel all appointments in this group visit?")) return;
@@ -452,8 +452,6 @@ export function GroupBookingPage() {
     if (res.ok) loadAll();
   }
 
-  const clientMap = new Map(clients.map((c) => [c.id, c.name]));
-
   if (loading && groups.length === 0) return <p style={{ padding: "1rem" }}>Loading…</p>;
   if (error) return <p style={{ padding: "1rem", color: "#dc2626" }}>Error: {error}</p>;