refactor(actions): complete admin request/csrf guard centralization

pages/admin/users/theme().php

@@ -3,7 +3,6 @@
 use MintyPHP\Http\Request;
 use MintyPHP\Http\SessionStoreInterface;
 use MintyPHP\Router;
-use MintyPHP\Session;
 use MintyPHP\Support\Guard;
 
 $sessionStore = app(SessionStoreInterface::class);
@@ -13,18 +12,16 @@ Guard::requireLogin();
 $userAccountService = app(\MintyPHP\Service\User\UserAccountService::class);
 $errorBag = formErrors();
 
-if ((requestInput()->method()) !== 'POST') {
-    Router::redirect('admin');
+if (!actionRequirePost('admin')) {
     return;
 }
 
-if (!Session::checkCsrfToken()) {
-    if (Request::wantsJson()) {
-        http_response_code(400);
-        Router::json(['ok' => false, 'error' => 'csrf']);
-        return;
-    }
-    Router::redirect('admin');
+if (!actionRequireCsrf(
+    'admin',
+    jsonAware: true,
+    jsonPayload: ['ok' => false, 'error' => 'csrf'],
+    flashOnFailure: false
+)) {
     return;
 }