fix: persistent sessiebeheer (remember-me), HTTPS-cookie herstel en Microsoft OAuth signed state flow

brainstorm.php

@@ -3,7 +3,8 @@
  * Fociz Brainstorm Sessies Overzicht
  */
 
-require_once __DIR__ . '/includes/header.php';
+require_once __DIR__ . '/includes/auth.php';
+$currentUser = require_auth();
 $db = get_db_connection();
 
 // Verwerk nieuwe sessie aanmaken
@@ -36,6 +37,7 @@ $stmtSessions = $db->query("
     ORDER BY s.created_at DESC
 ");
 $sessions = $stmtSessions->fetchAll();
+require_once __DIR__ . '/includes/header.php';
 ?>
 
 <div class="space-y-6">