fix: custom client, settings button (#10974)

Signed-off-by: fufesou <linlong1266@gmail.com>

flutter/lib/desktop/pages/desktop_home_page.dart

@@ -133,6 +133,8 @@ class _DesktopHomePageState extends State<DesktopHomePage>
         width: isIncomingOnly ? 280.0 : 200.0,
         color: Theme.of(context).colorScheme.background,
         child: Stack(
+          children: [
+            Column(
               children: [
                 SingleChildScrollView(
                   controller: _leftPaneScrollController,
@@ -141,6 +143,9 @@ class _DesktopHomePageState extends State<DesktopHomePage>
                     children: children,
                   ),
                 ),
+                Expanded(child: Container())
+              ],
+            ),
             if (isOutgoingOnly)
               Positioned(
                 bottom: 6,