opt: titlebar height autofit

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

flutter/lib/desktop/pages/connection_tab_page.dart

@@ -64,9 +64,7 @@ class _ConnectionTabPageState extends State<ConnectionTabPage>
         animationDuration: Duration.zero,
         child: Column(
           children: [
-            SizedBox(
+            DesktopTitleBar(
-              height: 50,
-              child: DesktopTitleBar(
               child: TabBar(
                   isScrollable: true,
                   labelColor: Colors.white,
@@ -95,7 +93,6 @@ class _ConnectionTabPageState extends State<ConnectionTabPage>
                           ))
                       .toList()),
             ),
-            ),
             Expanded(
               child: TabBarView(
                   children: connectionIds

flutter/lib/desktop/pages/desktop_home_page.dart

@@ -19,8 +19,6 @@ class _DesktopHomePageState extends State<DesktopHomePage> {
   Widget build(BuildContext context) {
     return Scaffold(
       body: Column(
-        children: [
-          Row(
         children: [
           DesktopTitleBar(
             child: Center(
@@ -32,8 +30,6 @@ class _DesktopHomePageState extends State<DesktopHomePage> {
                     fontWeight: FontWeight.bold),
               ),
             ),
-              )
-            ],
           ),
           Expanded(
             child: Container(

flutter/lib/desktop/widgets/titlebar_widget.dart

@@ -12,8 +12,7 @@ class DesktopTitleBar extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return Expanded(
+    return Container(
-      child: Container(
       decoration: const BoxDecoration(
         gradient: LinearGradient(
             begin: Alignment.topCenter,
@@ -22,6 +21,7 @@ class DesktopTitleBar extends StatelessWidget {
             stops: [0.0, 1.0]),
       ),
       child: WindowTitleBarBox(
+        child: SizedBox(
           child: Row(
             children: [
               Expanded(