Refactor StundePage to MVVM with DI

Jugenddienst Stunden/Views/StundePage.xaml

@@ -8,10 +8,6 @@
              x:Class="Jugenddienst_Stunden.Views.StundePage"
              Title="{Binding Title}">
 
-    <ContentPage.BindingContext>
-        <models:StundeViewModel />
-    </ContentPage.BindingContext>
-
     <ContentPage.Resources>
         <ResourceDictionary>
             <conv:IntBoolConverter x:Key="IntBoolConverter" />

Jugenddienst Stunden/Views/StundePage.xaml.cs

@@ -13,14 +13,13 @@ public partial class StundePage : ContentPage {
 	/// <summary>
 	/// CTOR
 	/// </summary>
-	public StundePage() {
+	public StundePage(StundeViewModel vm) {
 		InitializeComponent();
 
-		if (BindingContext is StundeViewModel vm) {
-			vm.AlertEvent += Vm_AlertEvent;
-			vm.InfoEvent += Vm_InfoEvent;
-			vm.ConfirmEvent += ShowConfirm;
-		}
+		BindingContext = vm;
+		vm.AlertEvent += Vm_AlertEvent;
+		vm.InfoEvent += Vm_InfoEvent;
+		vm.ConfirmEvent += ShowConfirm;
 	}
 
 	private void Vm_AlertEvent(object? sender, string e) {