fix: export _populateRecentVaultFilter from config.js, import in sidebar.js

frontend/js/config.js

@@ -116,7 +116,7 @@ function _refreshRecentTimestamps() {
   });
 }
 
-function _populateRecentVaultFilter() {
+export function _populateRecentVaultFilter() {
   const select = document.getElementById("recent-vault-filter");
   if (!select) return;
   // keep first option "Tous les vaults"

frontend/js/sidebar.js

@@ -2,6 +2,7 @@ import { state } from './state.js';
 import { safeCreateIcons, getFileIcon } from './utils.js';
 import { api } from './auth.js';
 import { populateCustomDropdown } from './ui.js';
+import { _populateRecentVaultFilter } from './config.js';
 import { el } from './viewer.js';
 
 // ---------------------------------------------------------------------------