fix: ConvertWindow ItemTemplate XamlReader 실패 + 진단/예외 핸들러

- ConvertWindow의 ItemTemplate을 코드비하인드 XamlReader.Parse 대신
  XAML 안에 <ItemsControl.ItemTemplate>으로 인라인 정의.
  XamlReader는 code-behind 메서드를 wire-up할 수 없어
  Click="OnRemoveEntry"가 매번 실패 → ConvertWindow 생성 시 예외 발생,
  GUI 상태가 깨져 변환 버튼 클릭이 처리되지 않던 근본 원인.
- OnConvertClick에 진단 로그(%TEMP%\EverythingToJpeg_dialog.log) 추가
- App에 전역 unhandled exception 핸들러 — DispatcherUnhandled,
  AppDomain.UnhandledException, TaskScheduler.UnobservedTaskException 모두
  %TEMP%\EverythingToJpeg_unhandled.log에 기록 + 메시지박스로 즉시 노출

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/EverythingToJpeg.App/App.xaml.cs

@@ -13,6 +13,8 @@ public partial class App : Application
     {
         base.OnStartup(e);
 
+        WireGlobalExceptionLogging();
+
         var parsed = CliRouter.Parse(e.Args);
 
         switch (parsed.Mode)
@@ -116,4 +118,38 @@ public partial class App : Application
             try { File.WriteAllText(logPath, log.ToString()); } catch { }
         }
     }
+
+    private static void WireGlobalExceptionLogging()
+    {
+        var path = Path.Combine(Path.GetTempPath(), "EverythingToJpeg_unhandled.log");
+
+        void Append(string source, Exception? ex)
+        {
+            try
+            {
+                File.AppendAllText(path,
+                    $"[{DateTime.Now:yyyy-MM-dd HH:mm:ss.fff}] {source}\n{ex}\n\n");
+            }
+            catch { }
+        }
+
+        AppDomain.CurrentDomain.UnhandledException += (_, e) =>
+            Append("AppDomain.UnhandledException", e.ExceptionObject as Exception);
+
+        Current.DispatcherUnhandledException += (_, e) =>
+        {
+            Append("Application.DispatcherUnhandledException", e.Exception);
+            MessageBox.Show(
+                "예기치 못한 오류:\n\n" + e.Exception.Message + "\n\n로그: " + path,
+                "EverythingToJpeg",
+                MessageBoxButton.OK, MessageBoxImage.Error);
+            e.Handled = true;
+        };
+
+        System.Threading.Tasks.TaskScheduler.UnobservedTaskException += (_, e) =>
+        {
+            Append("TaskScheduler.UnobservedTaskException", e.Exception);
+            e.SetObserved();
+        };
+    }
 }

src/EverythingToJpeg.App/Views/ConvertWindow.xaml

@@ -147,7 +147,51 @@
                     <TextBlock Text="대상 파일" Style="{StaticResource TextBodyStrong}"/>
                 </Border>
                 <ScrollViewer VerticalScrollBarVisibility="Auto" Padding="20,8,20,16">
-                    <ItemsControl x:Name="FilesList"/>
+                    <ItemsControl x:Name="FilesList">
+                        <ItemsControl.ItemTemplate>
+                            <DataTemplate>
+                                <Border Margin="0,0,0,6" Padding="12,8" CornerRadius="6"
+                                        Background="{DynamicResource SubtleFillColorTransparentBrush}"
+                                        BorderBrush="{DynamicResource ControlStrokeColorDefaultBrush}"
+                                        BorderThickness="1">
+                                    <Grid>
+                                        <Grid.ColumnDefinitions>
+                                            <ColumnDefinition Width="44"/>
+                                            <ColumnDefinition Width="*"/>
+                                            <ColumnDefinition Width="Auto"/>
+                                        </Grid.ColumnDefinitions>
+                                        <Border Width="40" Height="40" CornerRadius="4"
+                                                Background="{DynamicResource ControlFillColorDefaultBrush}">
+                                            <Image Source="{Binding Thumbnail}" Stretch="UniformToFill"/>
+                                        </Border>
+                                        <StackPanel Grid.Column="1" Margin="12,0,8,0" VerticalAlignment="Center">
+                                            <TextBlock Text="{Binding FileName}" FontWeight="SemiBold"
+                                                       TextTrimming="CharacterEllipsis"/>
+                                            <TextBlock Text="{Binding SubText}" FontSize="11"
+                                                       Foreground="{DynamicResource TextFillColorSecondaryBrush}"
+                                                       TextTrimming="CharacterEllipsis"/>
+                                            <TextBlock Text="{Binding State}" FontSize="11" Margin="0,2,0,0">
+                                                <TextBlock.Style>
+                                                    <Style TargetType="TextBlock">
+                                                        <Setter Property="Foreground"
+                                                                Value="{DynamicResource TextFillColorTertiaryBrush}"/>
+                                                        <Style.Triggers>
+                                                            <DataTrigger Binding="{Binding IsFailed}" Value="True">
+                                                                <Setter Property="Foreground" Value="#F87171"/>
+                                                            </DataTrigger>
+                                                        </Style.Triggers>
+                                                    </Style>
+                                                </TextBlock.Style>
+                                            </TextBlock>
+                                        </StackPanel>
+                                        <ui:Button Grid.Column="2" Icon="{ui:SymbolIcon Dismiss20}"
+                                                   Appearance="Transparent" Click="OnRemoveEntry"
+                                                   ToolTip="목록에서 제거"/>
+                                    </Grid>
+                                </Border>
+                            </DataTemplate>
+                        </ItemsControl.ItemTemplate>
+                    </ItemsControl>
                 </ScrollViewer>
             </DockPanel>
         </ui:Card>

src/EverythingToJpeg.App/Views/ConvertWindow.xaml.cs

@@ -22,7 +22,6 @@ public partial class ConvertWindow : FluentWindow
         InitializeComponent();
 
         FilesList.ItemsSource = _entries;
-        FilesList.ItemTemplate = (DataTemplate)CreateFileEntryTemplate();
 
         AddFiles(initialFiles);
 
@@ -113,19 +112,51 @@ public partial class ConvertWindow : FluentWindow
         }
     }
 
+    private static readonly string DialogLogPath =
+        Path.Combine(Path.GetTempPath(), "EverythingToJpeg_dialog.log");
+
+    private static void DiagLog(string line)
+    {
+        try
+        {
+            File.AppendAllText(DialogLogPath,
+                $"[{DateTime.Now:yyyy-MM-dd HH:mm:ss.fff}] {line}{Environment.NewLine}");
+        }
+        catch { }
+    }
+
     private async void OnConvertClick(object sender, RoutedEventArgs e)
     {
+        DiagLog($"OnConvertClick: entries={_entries.Count}");
+
         if (_entries.Count == 0)
         {
+            DiagLog("  → no entries, showing info");
             ShowInfo("변환할 파일이 없습니다.");
             return;
         }
 
         ConvertButton.IsEnabled = false;
         CancelButton.Content = "취소";
+        ProgressStatusText.Text = "준비 중…";
         _cts = new CancellationTokenSource();
 
-        var options = BuildOptions();
+        ConvertOptions options;
+        try
+        {
+            options = BuildOptions();
+            DiagLog($"  options: Quality={options.Quality} OutputLocation={options.OutputLocation} Custom={options.CustomOutputDirectory} Collision={options.OnCollision} MaxLong={options.MaxLongEdgePixels} PdfDpi={options.PdfDpi}");
+        }
+        catch (Exception ex)
+        {
+            DiagLog("  BuildOptions threw: " + ex);
+            ProgressStatusText.Text = "옵션 처리 오류: " + ex.Message;
+            ConvertButton.IsEnabled = true;
+            CancelButton.Content = "닫기";
+            _cts = null;
+            return;
+        }
+
         var reporter = new Progress<ConvertProgress>(p =>
         {
             var overall = p.Total == 0 ? 0 : (p.Index + p.FileProgress) / p.Total;
@@ -137,17 +168,27 @@ public partial class ConvertWindow : FluentWindow
         try
         {
             var sources = _entries.Select(en => en.Path).ToList();
+            DiagLog($"  starting ConvertManyAsync, {sources.Count} files");
             var results = await _engine.ConvertManyAsync(sources, options, reporter, _cts.Token);
+            DiagLog($"  finished, {results.Count} results");
+            foreach (var r in results)
+                DiagLog($"    [{r.Status}] {Path.GetFileName(r.SourcePath)} msg={r.Message}");
             ApplyResults(results);
             ProgressStatusText.Text = SummarizeResults(results);
         }
         catch (OperationCanceledException)
         {
+            DiagLog("  canceled");
             ProgressStatusText.Text = "변환이 취소되었습니다.";
         }
         catch (Exception ex)
         {
+            DiagLog("  EXCEPTION: " + ex);
             ProgressStatusText.Text = "오류: " + ex.Message;
+            MessageBox.Show(this,
+                "변환 중 오류가 발생했습니다:\n\n" + ex.Message + "\n\n로그: " + DialogLogPath,
+                "EverythingToJpeg",
+                MessageBoxButton.OK, MessageBoxImage.Error);
         }
         finally
         {
@@ -234,54 +275,6 @@ public partial class ConvertWindow : FluentWindow
         => MessageBox.Show(this, message, "EverythingToJpeg",
             MessageBoxButton.OK, MessageBoxImage.Information);
 
-    private object CreateFileEntryTemplate()
-    {
-        const string xaml = """
-        <DataTemplate xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-                      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-                      xmlns:ui="http://schemas.lepo.co/wpfui/2022/xaml">
-          <Border Margin="0,0,0,6" Padding="12,8" CornerRadius="6"
-                  Background="{DynamicResource SubtleFillColorTransparentBrush}"
-                  BorderBrush="{DynamicResource ControlStrokeColorDefaultBrush}"
-                  BorderThickness="1">
-            <Grid>
-              <Grid.ColumnDefinitions>
-                <ColumnDefinition Width="44"/>
-                <ColumnDefinition Width="*"/>
-                <ColumnDefinition Width="Auto"/>
-              </Grid.ColumnDefinitions>
-              <Border Width="40" Height="40" CornerRadius="4"
-                      Background="{DynamicResource ControlFillColorDefaultBrush}">
-                <Image Source="{Binding Thumbnail}" Stretch="UniformToFill"/>
-              </Border>
-              <StackPanel Grid.Column="1" Margin="12,0,8,0" VerticalAlignment="Center">
-                <TextBlock Text="{Binding FileName}" FontWeight="SemiBold"
-                           TextTrimming="CharacterEllipsis"/>
-                <TextBlock Text="{Binding SubText}" FontSize="11"
-                           Foreground="{DynamicResource TextFillColorSecondaryBrush}"
-                           TextTrimming="CharacterEllipsis"/>
-                <TextBlock Text="{Binding State}" FontSize="11" Margin="0,2,0,0">
-                  <TextBlock.Style>
-                    <Style TargetType="TextBlock">
-                      <Setter Property="Foreground" Value="{DynamicResource TextFillColorTertiaryBrush}"/>
-                      <Style.Triggers>
-                        <DataTrigger Binding="{Binding IsFailed}" Value="True">
-                          <Setter Property="Foreground" Value="#F87171"/>
-                        </DataTrigger>
-                      </Style.Triggers>
-                    </Style>
-                  </TextBlock.Style>
-                </TextBlock>
-              </StackPanel>
-              <ui:Button Grid.Column="2" Icon="{ui:SymbolIcon Dismiss20}"
-                         Appearance="Transparent" Click="OnRemoveEntry"
-                         ToolTip="목록에서 제거"/>
-            </Grid>
-          </Border>
-        </DataTemplate>
-        """;
-        return System.Windows.Markup.XamlReader.Parse(xaml);
-    }
 }
 
 public sealed class FileEntry : System.ComponentModel.INotifyPropertyChanged