feat: Divi tab with REST check, release and withdrawal

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

tests/Stubs/WpRestResponse.php

@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+// WP_HTTP_Response first: real WordPress' WP_REST_Response extends it (ConnectionUsage::successful()
+// tells a WP_REST_Response apart from a WP_Error/array via instanceof WP_HTTP_Response).
+if (! class_exists('WP_HTTP_Response')) {
+    class WP_HTTP_Response
+    {
+        /** @param array<string, string> $headers */
+        public function __construct(public mixed $data = null, public int $status = 200, public array $headers = [])
+        {
+        }
+
+        public function get_status(): int
+        {
+            return $this->status;
+        }
+
+        /** @return array<string, string> */
+        public function get_headers(): array
+        {
+            return $this->headers;
+        }
+    }
+}
+
+if (! class_exists('WP_REST_Response')) {
+    class WP_REST_Response extends WP_HTTP_Response
+    {
+    }
+}