Improve update detection

index.php

@@ -95,7 +95,7 @@ if ($options && !isset($_POST['install'])) {
             $version = str_replace('v', '', $tag);
 
             if (-1 === version_compare($options->version, $version)) {
-                $options->updateAvailable = true;
+                $options->setOption('updateAvailable', true);
             }
         } catch (\Github\Exception\RuntimeException $th) {
             echo wishthis\Page::warning($th->getMessage());

src/classes/options.php

@@ -12,8 +12,6 @@ namespace wishthis;
 
 class Options
 {
-    public bool $updateAvailable = false;
-
     public string $version;
 
     public function __construct(private Database $database)

src/classes/page.php

@@ -321,7 +321,7 @@ class Page
 
         global $options;
 
-        if ($options->updateAvailable && $user && 100 === $user->power) {
+        if ($options->getOption('updateAvailable') && $user && 100 === $user->power) {
             $pages['system']['items'][] = array(
                 'url'  => '/?page=update',
                 'text' => 'Update',

src/pages/update.php

@@ -88,6 +88,7 @@ if ('POST' === $_SERVER['REQUEST_METHOD']) {
 
     /** Update version */
     $options->setOption('version', $version);
+    $options->setOption('updateAvailable', false);
 
     header('Location: /?page=home');
     die();