updated comunication with firebase

src/lib/layout/selection.svelte.js

@@ -1,5 +1,5 @@
 import { db } from '../firebase.js';
-import { doc, onSnapshot, setDoc, updateDoc, arrayUnion, arrayRemove } from 'firebase/firestore';
+import { doc, onSnapshot, updateDoc, arrayUnion, arrayRemove } from 'firebase/firestore';
 
 let selected = $state(new Set());
 let totalCountries = $state(0);
@@ -20,25 +20,12 @@ export function initSelectionListener(uid) {
   });
 }
 
-const visitedRef = doc(db, 'visited', 'countries');
-
-onSnapshot(visitedRef, (snap) => {
-  if (snap.exists()) {
-    selected = new Set(snap.data().ids ?? []);
-  }
-});
-
-function persist() {
-  setDoc(visitedRef, { ids: [...selected] });
-}
-
 export function toggle(id) {
   const was = selected.has(id);
   const next = new Set(selected);
   if (was) next.delete(id);
   else next.add(id);
   selected = next;
-  persist();
   if (_uid) {
     const userRef = doc(db, 'users', _uid);
     if (was) updateDoc(userRef, { visitedCountries: arrayRemove(id) });
@@ -48,7 +35,6 @@ export function toggle(id) {
 
 export function clearAll() {
   selected = new Set();
-  persist();
   if (_uid) {
     const userRef = doc(db, 'users', _uid);
     updateDoc(userRef, { visitedCountries: [] });