Refactor code structure for improved readability and maintainability

planner.php

@@ -11,6 +11,7 @@ if ($isAjaxRequest) {
     require_once __DIR__ . '/includes/auth.php';
     $currentUser = require_auth(true);
 } else {
+    $pageTitle = 'Fociz — Planning & Structuur';
     require_once __DIR__ . '/includes/header.php';
 }
 
@@ -329,7 +330,7 @@ for ($h = $startHour; $h <= $endHour; $h++) {
                     <?php endif; ?>
                 </div>
                 <h1 class="text-2xl sm:text-3xl font-black tracking-tight text-slate-900 dark:text-white">
-                    Dagplanning & Structuur
+                    Planning & Structuur
                 </h1>
             </div>
 
@@ -957,7 +958,7 @@ if ($isAjaxRequest) {
         'syncHash'        => $initialSyncHash,
         'focusGoal'       => $dailyPlan['focus_goal'] ?? '',
         'dailyNotes'      => $dailyPlan['notes'] ?? '',
-        'title'           => 'Fociz — Dagplanning (' . $formattedSelectedDate . ')',
+        'title'           => 'Fociz — Planning (' . $formattedSelectedDate . ')',
         'html'            => $contentHtml,
     ]);
     exit;