feat(bar): 添加窗口列表显示当前 workspace 的窗口列表

src/bar/windows.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <stdint.h>
+#include <zdwm/bar.h>
+
+#include "core/listeners.h"
+
+typedef struct bar_windows_config_t {
+  uint32_t cell_padding;
+  const char *bg;
+  const char *fg;
+  const char *focused_bg;
+  const char *focused_fg;
+} bar_windows_config_t;
+
+extern zdwm_bar_item_type_t bar_windows;
+
+void bar_windows_add_listeners(listeners_t *listeners, void *state);