Move sidebar and offline imports to lazy loading

frontend/js/sync.js

@@ -2,7 +2,7 @@
 import { state } from './state.js';
 import { t } from './i18n.js';
 import { showToast } from './ui.js';
-import { api } from './auth.js';
+import { api, AuthManager } from './auth.js';
 import { loadVaults, loadTags, refreshTagsForContext, refreshSidebarTreePreservingState } from './sidebar.js';
 import { loadRecentFiles, initAboutModal } from './config.js';
 import { openFile } from './viewer.js';
@@ -591,8 +591,17 @@ export function init() {
   initOffline();
   initThemes();
   initAboutModal();
-  // Sync file index after a short delay (let vaults load first)
-  setTimeout(() => syncFileIndexFromServer(), 3000);
+  // Sync file index after a short delay (let vaults load first).
+  // Gate on auth at execution time (not scheduling time) so that
+  // initAuth() has a chance to complete and set _authEnabled / token.
+  // The login handler triggers syncFileIndexFromServer explicitly on
+  // fresh login, so we only do it here for already-authenticated or
+  // auth-disabled sessions.
+  setTimeout(() => {
+    if (!AuthManager._authEnabled || AuthManager.getToken()) {
+      syncFileIndexFromServer();
+    }
+  }, 3000);
   initDashboardTabs();
 
   // Listen for Forge editor rename events