made auto phpcbf changes; added some documentation

views/layouts/app.php

@@ -21,13 +21,14 @@
     </nav>
 
     <div class="container">
-        <?php if (isset($error) && !empty($error)): ?>
+        <?php if (isset($error) && !empty($error)) : ?>
             <div class="alert alert-danger" role="alert">
                 <?php echo $error; ?>
             </div>
         <?php endif; ?>
 
-        <?php if (isset($content) && is_callable($content)) $content(); ?>
+        <?php if (isset($content) && is_callable($content)) { $content();
+        } ?>
     </div>
 
     <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p" crossorigin="anonymous"></script>