Use base.js CSRF handling approach like kanban

- Remove manual CSRF token handling
- Let base.js automatically add X-CSRF-TOKEN header
- Use same approach as kanban board for AJAX requests

app/Modules/Tasks/Views/tasks/show.twig

@@ -227,37 +227,6 @@
 {% block scripts %}
 {{ parent() }}
 <script>
-function getCsrfToken() {
-    // 1. Пробуем из мета-тега
-    const meta = document.querySelector('meta[name="csrf-token"]');
-    if (meta && meta.getAttribute('content')) {
-        return meta.getAttribute('content');
-    }
-
-    // 2. Пробуем из data-атрибута body
-    if (document.body && document.body.dataset.csrfToken) {
-        return document.body.dataset.csrfToken;
-    }
-
-    // 3. Пробуем из скрытого input на странице
-    const csrfInput = document.querySelector('input[name*="csrf"]');
-    if (csrfInput && csrfInput.value) {
-        return csrfInput.value;
-    }
-
-    // 4. Пробуем из cookie
-    const cookies = document.cookie.split(';');
-    for (let cookie of cookies) {
-        const [name, value] = cookie.trim().split('=');
-        if (name === 'csrf_cookie_name' && value) {
-            return decodeURIComponent(value);
-        }
-    }
-
-    console.warn('CSRF token not found anywhere');
-    return '';
-}
-
 function addSubtask(event, taskId) {
     event.preventDefault();
     const form = event.target;
@@ -266,14 +235,13 @@ function addSubtask(event, taskId) {
 
     if (!title) return;
 
-    const csrfToken = getCsrfToken();
-
     fetch(`/tasks/${taskId}/subtasks`, {
         method: 'POST',
         headers: {
-            'X-Requested-With': 'XMLHttpRequest',
+            'Content-Type': 'application/x-www-form-urlencoded',
+            'X-Requested-With': 'XMLHttpRequest'
         },
-        body: 'title=' + encodeURIComponent(title) + '&csrf_token=' + csrfToken
+        body: 'title=' + encodeURIComponent(title)
     })
     .then(response => response.json())
     .then(data => {
@@ -322,14 +290,13 @@ function updateSubtasksCount() {
 }
 
 function toggleSubtask(taskId, subtaskId) {
-    const csrfToken = getCsrfToken();
-
     fetch(`/tasks/${taskId}/subtasks/${subtaskId}/toggle`, {
         method: 'POST',
         headers: {
-            'X-Requested-With': 'XMLHttpRequest',
+            'Content-Type': 'application/x-www-form-urlencoded',
+            'X-Requested-With': 'XMLHttpRequest'
         },
-        body: 'csrf_token=' + csrfToken
+        body: ''
     })
     .then(response => response.json())
     .then(data => {
@@ -349,14 +316,13 @@ function toggleSubtask(taskId, subtaskId) {
 function deleteSubtask(taskId, subtaskId) {
     if (!confirm('Удалить подзадачу?')) return;
 
-    const csrfToken = getCsrfToken();
-
     fetch(`/tasks/${taskId}/subtasks/${subtaskId}/delete`, {
         method: 'POST',
         headers: {
-            'X-Requested-With': 'XMLHttpRequest',
+            'Content-Type': 'application/x-www-form-urlencoded',
+            'X-Requested-With': 'XMLHttpRequest'
         },
-        body: 'csrf_token=' + csrfToken
+        body: ''
     })
     .then(response => response.json())
     .then(data => {