Initial

LehrerApp.Desktop/Views/ViewCodeBehind.cs

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+using Avalonia.Controls;
+
+namespace LehrerApp.Desktop.Views;
+
+// Code-behind Stubs für Views ohne eigene .axaml.cs
+// NavButton      → eigene NavButton.axaml.cs
+// SyncStatusBar  → eigene SyncStatusBar.axaml.cs
+
+public partial class DashboardView : UserControl
+{
+    public DashboardView() => InitializeComponent();
+}
+
+public partial class PlaceholderView : UserControl
+{
+    public PlaceholderView() => InitializeComponent();
+}