fix: fix boolean return type in totp.php, handle multi-statement sql and enable error reporting

includes/auth.php

@@ -13,7 +13,6 @@ function start_secure_session(): void {
         session_set_cookie_params([
             'lifetime' => 7 * 24 * 60 * 60, // 7 dagen
             'path' => '/',
-            'domain' => '',
             'secure' => $isSecure,
             'httponly' => true,
             'samesite' => 'Lax'
@@ -26,9 +25,13 @@ function start_secure_session(): void {
  * Controleert of er al een beheerder bestaat in MariaDB
  */
 function has_admin_user(): bool {
-    $db = get_db_connection();
-    $stmt = $db->query("SELECT COUNT(*) FROM users WHERE role = 'ADMIN'");
-    return ((int)$stmt->fetchColumn()) > 0;
+    try {
+        $db = get_db_connection();
+        $stmt = $db->query("SELECT COUNT(*) FROM users WHERE role = 'ADMIN'");
+        return ((int)$stmt->fetchColumn()) > 0;
+    } catch (Throwable $e) {
+        return false;
+    }
 }
 
 /**

includes/totp.php

@@ -76,7 +76,7 @@ class TOTP {
     /**
      * Verifieert een ingevoerde 6-cijferige 2FA code (met 1 tijdstap speling naar voor/achter)
      */
-    public static function verifyCode(string $secret, string $userInputCode, int $window = 1): boolean {
+    public static function verifyCode(string $secret, string $userInputCode, int $window = 1): bool {
         $userInputCode = trim(str_replace(' ', '', $userInputCode));
         if (strlen($userInputCode) !== 6 || !ctype_digit($userInputCode)) {
             return false;