샘플 ClientId 수정 및 로그인 창 조정

- appsettings.json: ClientId를 콘솔 등록값(4e4c88fc-...)으로 수정해 invalid_client 해결
- LoginWindow.xaml: 로그인 창 크기 조정 (520x760 → 1200x700)
- LoginWindow.xaml.cs: WebView2 UserDataFolder 이름 변경 (WebView2 → SSOWebView2)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

BaronSoftware.SSO/Features/LoginWindow/LoginWindow.xaml

@@ -3,7 +3,7 @@
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:wv2="clr-namespace:Microsoft.Web.WebView2.Wpf;assembly=Microsoft.Web.WebView2.Wpf"
-        Title="BARON 로그인" Height="760" Width="520"
+        Title="BARON 로그인" Height="700" Width="1200"
         WindowStartupLocation="CenterScreen">
     <Grid>
         <wv2:WebView2 x:Name="webview" />