refactor(core): 使用独立 bool 字段代替 geometry_mode 字段

将 fullscreen/maximized/minimized 从互斥枚举拆分为独立 bool 字段，以便
窗口状态切换时能回到上一状态。比如窗口初始为最大化状态，如果进入全屏状
态后从全屏状态退出时还能恢复最大化状态。

src/core/state.h

@@ -177,10 +177,20 @@ void state_window_set_workspace(
   window_id_t window_id,
   workspace_id_t workspace_id
 );
-void state_window_set_geometry_mode(
+void state_window_set_fullscreen(
   state_t *state,
   window_id_t window_id,
-  window_geometry_mode_t geometry_mode
+  bool fullscreen
+);
+void state_window_set_maximized(
+  state_t *state,
+  window_id_t window_id,
+  bool maximized
+);
+void state_window_set_minimized(
+  state_t *state,
+  window_id_t window_id,
+  bool minimized
 );
 void state_window_set_floating(
   state_t *state,