opt & fix:

- main window ui: adapt pc logic
- fix: platform infomation using device info plus

Signed-off-by: Kingtous <kingtous@qq.com>

flutter/lib/desktop/pages/desktop_home_page.dart

@@ -78,10 +78,11 @@ class _DesktopHomePageState extends State<DesktopHomePage> {
   buildServerBoard(BuildContext context) {
     return Column(
       crossAxisAlignment: CrossAxisAlignment.start,
+      mainAxisAlignment: MainAxisAlignment.start,
       children: [
         // buildControlPanel(context),
         // buildRecentSession(context),
-        ConnectionPage()
+        Expanded(child: ConnectionPage())
       ],
     );
   }