fix(desktop): 页面操作栏不再被当作标题栏拖动

.actionRegion 由 drag 改为 no-drag，修复顶部时间条、刷新按钮可拖动窗口、双击触发最大化的问题。

apps/desktop/src/shell/AppLayout.module.scss

@@ -151,7 +151,11 @@
   -ms-user-select: none;
   -webkit-touch-callout: none;
   -webkit-user-drag: none;
-  -webkit-app-region: drag;
+  // Page actions (e.g. the overview time-range bar and the floating refresh
+  // button) must not act as a window drag handle; the dedicated drag layer in
+  // AppHeader owns window dragging. Otherwise these controls get dragged and
+  // double-click maximizes the window.
+  -webkit-app-region: no-drag;
 }
 
 .actions {