Improve desktop UX and accessibility

LehrerApp.Desktop/Views/Dashboard/DashboardView.axaml

@@ -20,17 +20,17 @@
     <StackPanel Spacing="20">
 
       <!-- Begrüßung -->
-      <Grid ColumnDefinitions="*,Auto">
+      <Grid RowDefinitions="Auto,Auto">
         <StackPanel>
           <TextBlock Text="{Binding Greeting}" FontSize="14" Opacity="0.6"/>
           <TextBlock Text="{Binding CurrentDate}" FontSize="24" FontWeight="SemiBold"/>
         </StackPanel>
-        <StackPanel Grid.Column="1" Orientation="Horizontal" Spacing="8">
+        <WrapPanel Grid.Row="1" Orientation="Horizontal" ItemSpacing="8" LineSpacing="8" Margin="0,10,0,0">
           <Button Content="Klassenbuch abgleichen…" Click="OnCompareWebUntisDocumentationClick"
                   VerticalAlignment="Center"/>
           <Button Content="Bereiche anpassen" Command="{Binding ToggleDashboardSettingsCommand}"
                   VerticalAlignment="Center"/>
-        </StackPanel>
+        </WrapPanel>
       </Grid>
 
       <!-- Der Tagesfokus beantwortet zuerst die vier Fragen, die beim Öffnen der App zählen:
@@ -72,9 +72,13 @@
                 <StackPanel Orientation="Horizontal" Spacing="6">
                   <CheckBox Content="{Binding Title}" IsChecked="{Binding IsVisible}" VerticalAlignment="Center"/>
                   <Button Content="↑" Padding="6,2"
+                          ToolTip.Tip="Bereich nach oben verschieben"
+                          AutomationProperties.Name="Dashboard-Bereich nach oben verschieben"
                           Command="{Binding $parent[ItemsControl].((vm:DashboardViewModel)DataContext).MoveCardUpCommand}"
                           CommandParameter="{Binding}"/>
                   <Button Content="↓" Padding="6,2"
+                          ToolTip.Tip="Bereich nach unten verschieben"
+                          AutomationProperties.Name="Dashboard-Bereich nach unten verschieben"
                           Command="{Binding $parent[ItemsControl].((vm:DashboardViewModel)DataContext).MoveCardDownCommand}"
                           CommandParameter="{Binding}"/>
                 </StackPanel>
@@ -250,8 +254,10 @@
                          Width="130" Margin="12,0"/>
               <Button Grid.Column="2" Content="Heute" FontSize="11" Padding="8,2"
                       Command="{Binding CalendarTodayCommand}" Margin="0,0,4,0"/>
-              <Button Grid.Column="3" Content="‹" Padding="8,2" Command="{Binding PrevMonthCommand}"/>
-              <Button Grid.Column="4" Content="›" Padding="8,2" Command="{Binding NextMonthCommand}" Margin="4,0,0,0"/>
+              <Button Grid.Column="3" Content="‹" Padding="8,2" Command="{Binding PrevMonthCommand}"
+                      ToolTip.Tip="Vorheriger Monat" AutomationProperties.Name="Vorheriger Monat"/>
+              <Button Grid.Column="4" Content="›" Padding="8,2" Command="{Binding NextMonthCommand}" Margin="4,0,0,0"
+                      ToolTip.Tip="Nächster Monat" AutomationProperties.Name="Nächster Monat"/>
             </Grid>
 
             <ItemsControl ItemsSource="{Binding CalendarWeekdayHeaders}">

LehrerApp.Desktop/Views/Exams/ExamsOverviewView.axaml

@@ -182,8 +182,14 @@
     <!-- Liste aller Klausuren, nach Priorität sortiert (nicht nach Datum) ─────────── -->
     <ScrollViewer Grid.Row="2" Margin="20,0,20,16">
       <StackPanel>
-        <TextBlock Text="{Binding EmptyHint}" Classes="emptyhint" Margin="0,20,0,0"
-                    IsVisible="{Binding EmptyHint, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
+        <StackPanel Margin="0,28,0,0" Spacing="10" HorizontalAlignment="Center"
+                    IsVisible="{Binding HasNoExams}">
+          <TextBlock Text="Noch keine Klausuren im aktuellen Schuljahr." Classes="emptyhint"
+                     FontSize="15" TextAlignment="Center"/>
+          <TextBlock Text="Klausuren werden im jeweiligen Kurs angelegt." FontSize="12" Opacity="0.55"/>
+          <Button Content="Zu den Lerngruppen" Command="{Binding GoToGroupsCommand}"
+                  HorizontalAlignment="Center"/>
+        </StackPanel>
         <ItemsControl ItemsSource="{Binding Rows}">
           <ItemsControl.ItemTemplate>
             <DataTemplate x:DataType="vm:ExamListRowViewModel">

LehrerApp.Desktop/Views/Groups/GroupDetailView.axaml

@@ -13,9 +13,9 @@
     <Border Grid.Row="0" Padding="20,16"
             BorderBrush="{DynamicResource SystemControlForegroundBaseLowBrush}"
             BorderThickness="0,0,0,1">
-      <Grid ColumnDefinitions="*,Auto">
-        <shared:PageHeader Grid.Column="0" Title="{Binding GroupTitle}" Subtitle="{Binding GroupSubtitle}"/>
-        <StackPanel Grid.Column="1" Orientation="Horizontal" Spacing="8">
+      <Grid RowDefinitions="Auto,Auto">
+        <shared:PageHeader Title="{Binding GroupTitle}" Subtitle="{Binding GroupSubtitle}"/>
+        <WrapPanel Grid.Row="1" Orientation="Horizontal" ItemSpacing="8" LineSpacing="8" Margin="0,10,0,0">
           <TextBlock VerticalAlignment="Center" Opacity="0.6" FontSize="13">
             <Run Text="{Binding StudentCount}"/>
             <Run Text=" Schüler"/>
@@ -34,7 +34,7 @@
           <Button Content="Austragung zurücknehmen" Command="{Binding ReinstateStudentCommand}"
                   IsVisible="{Binding SelectedStudent.HasExitDate}"/>
           <Button Content="＋ Klausur" Command="{Binding AddExamCommand}" IsEnabled="{Binding IsEditable}"/>
-        </StackPanel>
+        </WrapPanel>
       </Grid>
     </Border>
 

LehrerApp.Desktop/Views/Groups/GroupListView.axaml

@@ -11,13 +11,14 @@
     <Border Grid.Row="0" Padding="20,16"
             BorderBrush="{DynamicResource SystemControlForegroundBaseLowBrush}"
             BorderThickness="0,0,0,1">
-      <Grid ColumnDefinitions="*,Auto,Auto">
-        <shared:PageHeader Grid.Column="0" Title="Lerngruppen" Subtitle="{Binding ListSummary}"/>
-        <ComboBox Grid.Column="1" ItemsSource="{Binding SchoolYears}"
+      <Grid RowDefinitions="Auto,Auto" ColumnDefinitions="*,Auto,Auto">
+        <shared:PageHeader Grid.ColumnSpan="3" Title="Lerngruppen" Subtitle="{Binding ListSummary}"/>
+        <ComboBox Grid.Row="1" Grid.Column="1" ItemsSource="{Binding SchoolYears}"
                   SelectedItem="{Binding SelectedSchoolYear}"
-                  Width="100" Margin="0,0,8,0" VerticalAlignment="Center"/>
-        <Button Grid.Column="2" Content="＋ Neue Gruppe"
-                Command="{Binding AddGroupCommand}" VerticalAlignment="Center"/>
+                  Width="110" Margin="0,10,8,0" VerticalAlignment="Center"
+                  AutomationProperties.Name="Schuljahr auswählen"/>
+        <Button Grid.Row="1" Grid.Column="2" Content="＋ Neue Gruppe"
+                Command="{Binding AddGroupCommand}" VerticalAlignment="Center" Margin="0,10,0,0"/>
       </Grid>
     </Border>
 
@@ -76,7 +77,7 @@
                       </StackPanel>
                     </StackPanel>
                   </Button>
-                  <Button Grid.Column="2" Content="⋯" Width="36" Height="32" Margin="0,10,10,0"
+                  <Button Grid.Column="2" Content="⋯" Width="40" Height="40" Margin="0,10,10,0"
                           Padding="0" VerticalAlignment="Top"
                           ToolTip.Tip="Lerngruppe verwalten"
                           AutomationProperties.Name="{Binding ManageAutomationName}">

LehrerApp.Desktop/Views/MainWindow.axaml

@@ -22,7 +22,7 @@
         x:DataType="vm:MainWindowViewModel"
         Title="LehrerApp"
         Width="1280" Height="800"
-        MinWidth="900" MinHeight="600">
+        MinWidth="640" MinHeight="480">
 
   <Panel>
   <!--
@@ -81,14 +81,14 @@
                FontFamily explizit auf die farbige Emoji-Schrift gepinnt: Windows kann für
                Emoji-Codepoints je nach Fallback-Auflösung sonst auf "Segoe UI Symbol"
                (einfarbig/schwarz) statt "Segoe UI Emoji" (farbig) ausweichen. -->
-          <Style Selector="TextBlock.navicon">
-            <Setter Property="FontSize" Value="15"/>
+          <Style Selector="PathIcon.navicon">
             <Setter Property="Width" Value="24"/>
-            <Setter Property="FontFamily" Value="Segoe UI Emoji,Segoe UI Symbol,Segoe UI"/>
+            <Setter Property="Height" Value="24"/>
           </Style>
           <Style Selector="Button.navitem">
             <Setter Property="Background" Value="Transparent"/>
             <Setter Property="Padding" Value="10,8"/>
+            <Setter Property="MinHeight" Value="40"/>
           </Style>
           <Style Selector="Button.navitem.active">
             <Setter Property="Background" Value="{DynamicResource SystemControlBackgroundAccentBrush}"/>
@@ -98,9 +98,9 @@
           <Style Selector="DockPanel.compact TextBlock.navlabel">
             <Setter Property="IsVisible" Value="False"/>
           </Style>
-          <Style Selector="DockPanel.compact TextBlock.navicon">
-            <Setter Property="FontSize" Value="20"/>
+          <Style Selector="DockPanel.compact PathIcon.navicon">
             <Setter Property="Width" Value="28"/>
+            <Setter Property="Height" Value="28"/>
           </Style>
           <Style Selector="DockPanel.compact Button.navitem">
             <Setter Property="HorizontalContentAlignment" Value="Center"/>
@@ -157,7 +157,7 @@
                     ToolTip.Tip="Suchen und schnell erfassen (Strg/⌘+K)"
                     AutomationProperties.Name="Suchen und schnell erfassen">
               <Grid ColumnDefinitions="Auto,*,Auto">
-                <TextBlock Classes="navicon" Text="⌕" TextAlignment="Center"/>
+                <PathIcon Classes="navicon" Data="{StaticResource IconSearch}"/>
                 <TextBlock Grid.Column="1" Classes="navlabel" Text="Suchen / Erfassen"/>
                 <TextBlock Grid.Column="2" Classes="navlabel" Text="⌘K" FontSize="10" Opacity="0.45"
                            VerticalAlignment="Center"/>
@@ -169,9 +169,10 @@
                     HorizontalContentAlignment="Left"
                     CornerRadius="6"
                     Command="{Binding NavigateToCommand}"
-                    CommandParameter="{x:Static vm:NavItem.Dashboard}">
+                    CommandParameter="{x:Static vm:NavItem.Dashboard}"
+                    ToolTip.Tip="Dashboard (Strg/⌘+1)" AutomationProperties.Name="Dashboard">
               <StackPanel Classes="navcontent" Orientation="Horizontal" Spacing="10">
-                <TextBlock Classes="navicon" Text="📊" TextAlignment="Center"/>
+                <PathIcon Classes="navicon" Data="{StaticResource IconDashboard}"/>
                 <TextBlock Classes="navlabel" Text="Dashboard"/>
               </StackPanel>
             </Button>
@@ -183,9 +184,10 @@
                     HorizontalContentAlignment="Left"
                     CornerRadius="6"
                     Command="{Binding NavigateToCommand}"
-                    CommandParameter="{x:Static vm:NavItem.Groups}">
+                    CommandParameter="{x:Static vm:NavItem.Groups}"
+                    ToolTip.Tip="Lerngruppen (Strg/⌘+2)" AutomationProperties.Name="Lerngruppen">
               <StackPanel Classes="navcontent" Orientation="Horizontal" Spacing="10">
-                <TextBlock Classes="navicon" Text="🏫" TextAlignment="Center"/>
+                <PathIcon Classes="navicon" Data="{StaticResource IconGroups}"/>
                 <TextBlock Classes="navlabel" Text="Lerngruppen"/>
               </StackPanel>
             </Button>
@@ -193,9 +195,10 @@
                     HorizontalContentAlignment="Left"
                     CornerRadius="6"
                     Command="{Binding NavigateToCommand}"
-                    CommandParameter="{x:Static vm:NavItem.Students}">
+                    CommandParameter="{x:Static vm:NavItem.Students}"
+                    ToolTip.Tip="Schüler (Strg/⌘+3)" AutomationProperties.Name="Schüler">
               <StackPanel Classes="navcontent" Orientation="Horizontal" Spacing="10">
-                <TextBlock Classes="navicon" Text="👤" TextAlignment="Center"/>
+                <PathIcon Classes="navicon" Data="{StaticResource IconStudents}"/>
                 <TextBlock Classes="navlabel" Text="Schüler"/>
               </StackPanel>
             </Button>
@@ -203,9 +206,10 @@
                     HorizontalContentAlignment="Left"
                     CornerRadius="6"
                     Command="{Binding NavigateToCommand}"
-                    CommandParameter="{x:Static vm:NavItem.Exams}">
+                    CommandParameter="{x:Static vm:NavItem.Exams}"
+                    ToolTip.Tip="Klausuren (Strg/⌘+4)" AutomationProperties.Name="Klausuren">
               <StackPanel Classes="navcontent" Orientation="Horizontal" Spacing="10">
-                <TextBlock Classes="navicon" Text="📝" TextAlignment="Center"/>
+                <PathIcon Classes="navicon" Data="{StaticResource IconExams}"/>
                 <TextBlock Classes="navlabel" Text="Klausuren"/>
               </StackPanel>
             </Button>
@@ -213,9 +217,10 @@
                     HorizontalContentAlignment="Left"
                     CornerRadius="6"
                     Command="{Binding NavigateToCommand}"
-                    CommandParameter="{x:Static vm:NavItem.Planner}">
+                    CommandParameter="{x:Static vm:NavItem.Planner}"
+                    ToolTip.Tip="Planung (Strg/⌘+5)" AutomationProperties.Name="Planung">
               <StackPanel Classes="navcontent" Orientation="Horizontal" Spacing="10">
-                <TextBlock Classes="navicon" Text="📅" TextAlignment="Center"/>
+                <PathIcon Classes="navicon" Data="{StaticResource IconCalendar}"/>
                 <TextBlock Classes="navlabel" Text="Planung"/>
               </StackPanel>
             </Button>
@@ -227,9 +232,10 @@
                     HorizontalContentAlignment="Left"
                     CornerRadius="6"
                     Command="{Binding NavigateToCommand}"
-                    CommandParameter="{x:Static vm:NavItem.Workload}">
+                    CommandParameter="{x:Static vm:NavItem.Workload}"
+                    ToolTip.Tip="Arbeitszeit (Strg/⌘+6)" AutomationProperties.Name="Arbeitszeit">
               <StackPanel Classes="navcontent" Orientation="Horizontal" Spacing="10">
-                <TextBlock Classes="navicon" Text="⏱" TextAlignment="Center"/>
+                <PathIcon Classes="navicon" Data="{StaticResource IconClock}"/>
                 <TextBlock Classes="navlabel" Text="Arbeitszeit"/>
               </StackPanel>
             </Button>
@@ -237,9 +243,10 @@
                     HorizontalContentAlignment="Left"
                     CornerRadius="6"
                     Command="{Binding NavigateToCommand}"
-                    CommandParameter="{x:Static vm:NavItem.ClassTeacher}">
+                    CommandParameter="{x:Static vm:NavItem.ClassTeacher}"
+                    ToolTip.Tip="Klassenlehrer (Strg/⌘+7)" AutomationProperties.Name="Klassenlehrer">
               <StackPanel Classes="navcontent" Orientation="Horizontal" Spacing="10">
-                <TextBlock Classes="navicon" Text="🎓" TextAlignment="Center"/>
+                <PathIcon Classes="navicon" Data="{StaticResource IconClassTeacher}"/>
                 <TextBlock Classes="navlabel" Text="Klassenlehrer"/>
               </StackPanel>
             </Button>
@@ -247,9 +254,10 @@
                     HorizontalContentAlignment="Left"
                     CornerRadius="6"
                     Command="{Binding NavigateToCommand}"
-                    CommandParameter="{x:Static vm:NavItem.Settings}">
+                    CommandParameter="{x:Static vm:NavItem.Settings}"
+                    ToolTip.Tip="Einstellungen (Strg/⌘+8)" AutomationProperties.Name="Einstellungen">
               <StackPanel Classes="navcontent" Orientation="Horizontal" Spacing="10">
-                <TextBlock Classes="navicon" Text="⚙️" TextAlignment="Center"/>
+                <PathIcon Classes="navicon" Data="{StaticResource IconSettings}"/>
                 <TextBlock Classes="navlabel" Text="Einstellungen"/>
               </StackPanel>
             </Button>

LehrerApp.Desktop/Views/MainWindow.axaml.cs

@@ -36,6 +36,13 @@ public partial class MainWindow : Window
             return;
         }
 
+        if (commandModifier && TryGetNavigationShortcut(e.Key, out var destination))
+        {
+            vm.NavigateToCommand.Execute(destination);
+            e.Handled = true;
+            return;
+        }
+
         if (!vm.IsCommandPaletteOpen) return;
         if (e.Key == Key.Escape)
         {
@@ -54,6 +61,23 @@ public partial class MainWindow : Window
         }
     }
 
+    private static bool TryGetNavigationShortcut(Key key, out NavItem destination)
+    {
+        destination = key switch
+        {
+            Key.D1 or Key.NumPad1 => NavItem.Dashboard,
+            Key.D2 or Key.NumPad2 => NavItem.Groups,
+            Key.D3 or Key.NumPad3 => NavItem.Students,
+            Key.D4 or Key.NumPad4 => NavItem.Exams,
+            Key.D5 or Key.NumPad5 => NavItem.Planner,
+            Key.D6 or Key.NumPad6 => NavItem.Workload,
+            Key.D7 or Key.NumPad7 => NavItem.ClassTeacher,
+            Key.D8 or Key.NumPad8 => NavItem.Settings,
+            _ => default,
+        };
+        return key is >= Key.D1 and <= Key.D8 or >= Key.NumPad1 and <= Key.NumPad8;
+    }
+
     private void OnOpenCommandPaletteClick(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
     {
         if (DataContext is MainWindowViewModel vm)

LehrerApp.Desktop/Views/Planning/TimetableView.axaml

@@ -154,9 +154,11 @@
 
               <Grid ColumnDefinitions="Auto,Auto,*,Auto,Auto,Auto">
                 <Button Grid.Column="0" Content="‹" FontWeight="Bold" Padding="10,4"
-                        Command="{Binding PreviousWeekCommand}" ToolTip.Tip="Vorherige Woche"/>
+                        Command="{Binding PreviousWeekCommand}" ToolTip.Tip="Vorherige Woche"
+                        AutomationProperties.Name="Vorherige Woche"/>
                 <Button Grid.Column="1" Content="›" FontWeight="Bold" Padding="10,4" Margin="4,0,0,0"
-                        Command="{Binding NextWeekCommand}" ToolTip.Tip="Nächste Woche"/>
+                        Command="{Binding NextWeekCommand}" ToolTip.Tip="Nächste Woche"
+                        AutomationProperties.Name="Nächste Woche"/>
                 <TextBlock Grid.Column="2" FontSize="16" FontWeight="SemiBold"
                            VerticalAlignment="Center" Margin="12,0,0,0">
                   <Run Text="Woche "/><Run Text="{Binding WeekRangeLabel}"/>
@@ -166,7 +168,8 @@
                 <Button Grid.Column="4" Content="Ausnahme eintragen" Margin="0,0,8,0"
                         Command="{Binding AddSubstitutionCommand}"/>
                 <Button Grid.Column="5" Content="⚙️" Command="{Binding OpenSettingsCommand}"
-                        ToolTip.Tip="Einstellungen (Ferien, Aufsichten, Stundenraster)"/>
+                        ToolTip.Tip="Einstellungen (Ferien, Aufsichten, Stundenraster)"
+                        AutomationProperties.Name="Stundenplan-Einstellungen"/>
               </Grid>
 
               <Border Background="#33F59E0B" BorderBrush="#F59E0B" BorderThickness="1"
@@ -281,7 +284,7 @@
                                 <Button Classes="weekCellMenuTrigger" Content="⋮"
                                         HorizontalAlignment="Right" VerticalAlignment="Top"
                                         IsVisible="{Binding HasGroupId}"
-                                        ToolTip.Tip="Weitere Ziele…">
+                                        ToolTip.Tip="Weitere Ziele…" AutomationProperties.Name="Weitere Ziele">
                                   <Button.Flyout>
                                     <MenuFlyout Placement="BottomEdgeAlignedRight">
                                       <MenuItem Header="▶ Unterrichtsansicht" IsVisible="{Binding HasLesson}"
@@ -404,7 +407,8 @@
                                     HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
                                     HorizontalContentAlignment="Center" Background="Transparent"
                                     Command="{Binding $parent[ItemsControl;1].((vm:TimetableViewModel)DataContext).EditCellCommand}"
-                                    CommandParameter="{Binding}"/>
+                                    CommandParameter="{Binding}"
+                                    AutomationProperties.Name="Stundenplan-Eintrag hinzufügen"/>
                             <Border Background="#D85A30" CornerRadius="8" Padding="5,1"
                                     IsVisible="{Binding HasBadge}"
                                     HorizontalAlignment="Right" VerticalAlignment="Top" Margin="2">

LehrerApp.Desktop/Views/Students/StudentListView.axaml

@@ -8,18 +8,21 @@
     <Border Grid.Row="0" Padding="20,16"
             BorderBrush="{DynamicResource SystemControlForegroundBaseLowBrush}"
             BorderThickness="0,0,0,1">
-      <Grid ColumnDefinitions="*,Auto,Auto,Auto">
-        <shared:PageHeader Grid.Column="0" Title="Schüler" Subtitle="{Binding CountSummary}"/>
-        <CheckBox Grid.Column="1" Content="Inaktive anzeigen"
+      <Grid RowDefinitions="Auto,Auto" ColumnDefinitions="*,Auto,Auto,Auto">
+        <shared:PageHeader Grid.ColumnSpan="4" Title="Schüler" Subtitle="{Binding CountSummary}"/>
+        <CheckBox Grid.Row="1" Grid.Column="1" Content="Inaktive anzeigen"
                   IsChecked="{Binding ShowInactive}"
-                  VerticalAlignment="Center" Margin="0,0,12,0"/>
-        <Button Grid.Column="2" Content="⇩ Importieren…" Click="OnImportClick"
-                VerticalAlignment="Center" Margin="0,0,8,0"/>
-        <Button Grid.Column="3" Content="＋ Neuer Schüler"
-                Command="{Binding AddStudentCommand}" VerticalAlignment="Center"/>
+                  VerticalAlignment="Center" Margin="0,10,12,0"/>
+        <Button Grid.Row="1" Grid.Column="2" Content="⇩ Importieren…" Click="OnImportClick"
+                IsEnabled="{Binding !IsImporting}"
+                VerticalAlignment="Center" Margin="0,10,8,0"
+                AutomationProperties.Name="Schüler importieren"/>
+        <Button Grid.Row="1" Grid.Column="3" Content="＋ Neuer Schüler"
+                Command="{Binding AddStudentCommand}" VerticalAlignment="Center" Margin="0,10,0,0"/>
       </Grid>
     </Border>
-    <DockPanel Grid.Row="1">
+    <Grid Grid.Row="1">
+    <DockPanel IsVisible="{Binding HasStudents}">
       <TextBox DockPanel.Dock="Top" Text="{Binding SearchText}"
                PlaceholderText="Name oder Lerngruppe suchen…" Margin="16,10,16,4"/>
       <DataGrid ItemsSource="{Binding Students}"
@@ -45,5 +48,22 @@
         </DataGrid.Columns>
       </DataGrid>
     </DockPanel>
+      <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center" Spacing="10"
+                  IsVisible="{Binding HasNoStudents}">
+        <TextBlock Text="{Binding EmptyListMessage}" Classes="emptyhint" FontSize="15"
+                   TextAlignment="Center"/>
+        <StackPanel Orientation="Horizontal" HorizontalAlignment="Center" Spacing="8"
+                    IsVisible="{Binding SearchText, Converter={x:Static StringConverters.IsNullOrEmpty}}">
+          <Button Content="＋ Ersten Schüler anlegen" Command="{Binding AddStudentCommand}"/>
+          <Button Content="⇩ Schülerliste importieren" Click="OnImportClick"/>
+        </StackPanel>
+      </StackPanel>
+      <Border Background="#70000000" IsVisible="{Binding IsImporting}">
+        <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center" Spacing="10">
+          <ProgressBar IsIndeterminate="True" Width="220" Height="5"/>
+          <TextBlock Text="Schülerliste wird analysiert …" Foreground="White"/>
+        </StackPanel>
+      </Border>
+    </Grid>
   </Grid>
 </UserControl>

LehrerApp.Desktop/Views/Students/StudentListView.axaml.cs

@@ -36,6 +36,7 @@ public partial class StudentListView : UserControl
         });
         if (files.Count == 0) return;
 
+        list.IsImporting = true;
         try
         {
             await using var source = await files[0].OpenReadAsync();
@@ -67,5 +68,9 @@ public partial class StudentListView : UserControl
         {
             App.Services.GetRequiredService<NotificationService>().ShowError(ex.Message);
         }
+        finally
+        {
+            list.IsImporting = false;
+        }
     }
 }

LehrerApp.Desktop/Views/SyncStatusBar.axaml

@@ -14,10 +14,17 @@
                  Foreground="#D32F2F"/>
       <TextBlock Text="Sync angehalten" FontSize="10" Foreground="#D32F2F" Opacity="0.8"/>
     </StackPanel>
-    <Button Grid.Column="1" Content="↻" FontSize="14"
+    <Button Grid.Column="1" Classes="touchTarget"
             Command="{Binding SyncNowCommand}"
             IsVisible="{Binding CanAttemptSync}"
-            Background="Transparent" Padding="6,4"
-            ToolTip.Tip="Jetzt synchronisieren"/>
+            Background="Transparent" Padding="8"
+            ToolTip.Tip="Jetzt synchronisieren" AutomationProperties.Name="Jetzt synchronisieren">
+      <Grid>
+        <PathIcon Data="{StaticResource IconRefresh}" Width="18" Height="18"
+                  IsVisible="{Binding !IsSyncing}"/>
+        <ProgressBar Width="22" Height="4" IsIndeterminate="True"
+                     IsVisible="{Binding IsSyncing}"/>
+      </Grid>
+    </Button>
   </Grid>
 </UserControl>