backend: X11 后端添加窗口属性和状态查询接口

src/backend/x11/window.h

@@ -1,8 +1,10 @@
 #pragma once
 
+#include <stddef.h>
 #include <xcb/xproto.h>
 
 #include "core/backend.h"
+#include "core/window.h"
 
 /**
  * @brief 获取窗口的 role 属性
@@ -31,3 +33,14 @@ char *window_get_title(backend_t *backend, xcb_window_t window);
  */
 void window_get_class(backend_t *backend, xcb_window_t window, char **class_out,
                       char **instance_out);
+
+xcb_window_t window_get_transient_for(backend_t *backend, xcb_window_t window);
+
+xcb_get_window_attributes_reply_t *window_get_attributes(backend_t *backend,
+                                                         xcb_window_t window);
+bool window_get_skip_taskbar(backend_t *backend, xcb_window_t window);
+bool window_get_urgency(backend_t *backend, xcb_window_t window);
+bool window_get_types(backend_t *backend, xcb_window_t window,
+                      window_type_t **types, size_t *count);
+bool window_get_states(backend_t *backend, xcb_window_t window,
+                       window_state_t **states, size_t *count);