fix: settings logout buttons now call AuthManager.logout() directly

- Replaced window.handleLogout indirection with direct AuthManager.logout() call
- config.js already imports AuthManager from auth.js — no race condition
- Same direct call as header button (auth.js line 210)

frontend/js/config.js

@@ -631,16 +631,11 @@ function initConfigModal() {
     });
   }
 
-  // Logout button (always visible) — delegates to global handleLogout (no confirm)
+  // Logout button (always visible) — calls AuthManager.logout() directly
   var logoutBtn = document.getElementById("logout-btn");
   if (logoutBtn) {
     logoutBtn.addEventListener("click", function() {
-      if (typeof window.handleLogout === 'function') {
-        window.handleLogout();
-      } else {
-        fetch('/api/auth/logout', { method: 'POST', credentials: 'include' })
-          .finally(function() { window.location.href = '/'; });
-      }
+      AuthManager.logout();
     });
   }
 
@@ -1577,15 +1572,9 @@ function initProfile() {
     } catch(e) {}
   });
 
-  // Logout button — delegates to global handleLogout (no confirm)
+  // Logout button — calls AuthManager.logout() directly
   if (logoutBtn) {
     logoutBtn.addEventListener('click', function() {
-      if (typeof window.handleLogout === 'function') {
-        window.handleLogout();
-      } else {
-        fetch('/api/auth/logout', { method: 'POST', credentials: 'include' })
-          .finally(function() { window.location.href = '/'; });
-      }
+      AuthManager.logout();
     });
   }
-}