feat(ui): add MissionControl window + grid

src/ClaudeDo.Localization/locales/de.json

@@ -235,7 +235,10 @@
   },
   "missionControl": {
     "openInApp": "In App öffnen",
-    "cancel": "Abbrechen"
+    "cancel": "Abbrechen",
+    "windowTitle": "Mission Control",
+    "clearFinished": "Erledigte entfernen",
+    "empty": "Keine laufenden Aufgaben"
   },
   "modals": {
     "logVisualizer": {

src/ClaudeDo.Localization/locales/en.json

@@ -235,7 +235,10 @@
   },
   "missionControl": {
     "openInApp": "Open in app",
-    "cancel": "Cancel"
+    "cancel": "Cancel",
+    "windowTitle": "Mission Control",
+    "clearFinished": "Clear finished",
+    "empty": "No running tasks"
   },
   "modals": {
     "logVisualizer": {

src/ClaudeDo.Ui/Views/MissionControl/MissionControlView.axaml

@@ -0,0 +1,49 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="using:ClaudeDo.Ui.ViewModels"
+             xmlns:vmi="using:ClaudeDo.Ui.ViewModels.Islands"
+             xmlns:mc="using:ClaudeDo.Ui.Views.MissionControl"
+             xmlns:loc="using:ClaudeDo.Ui.Localization"
+             x:DataType="vm:MissionControlViewModel"
+             x:Class="ClaudeDo.Ui.Views.MissionControl.MissionControlView">
+  <DockPanel LastChildFill="True" Background="{DynamicResource VoidBrush}">
+
+    <!-- Header -->
+    <Border DockPanel.Dock="Top"
+            Background="{DynamicResource DeepBrush}"
+            BorderBrush="{DynamicResource LineBrush}"
+            BorderThickness="0,0,0,1" Padding="14,8">
+      <Grid ColumnDefinitions="*,Auto">
+        <TextBlock Grid.Column="0" Classes="eyebrow"
+                   Text="{loc:Tr missionControl.windowTitle}"
+                   Foreground="{DynamicResource TextBrush}"
+                   LetterSpacing="1.4" VerticalAlignment="Center" />
+        <Button Grid.Column="1" Classes="btn"
+                Content="{loc:Tr missionControl.clearFinished}"
+                Command="{Binding ClearFinishedCommand}" />
+      </Grid>
+    </Border>
+
+    <!-- Grid / empty state -->
+    <Panel Margin="6">
+      <ItemsControl ItemsSource="{Binding Monitors}" IsVisible="{Binding HasMonitors}">
+        <ItemsControl.ItemsPanel>
+          <ItemsPanelTemplate>
+            <UniformGrid x:CompileBindings="False" Columns="{Binding ColumnCount}" />
+          </ItemsPanelTemplate>
+        </ItemsControl.ItemsPanel>
+        <ItemsControl.ItemTemplate>
+          <DataTemplate x:DataType="vmi:TaskMonitorViewModel">
+            <mc:MonitorPaneView Margin="6" />
+          </DataTemplate>
+        </ItemsControl.ItemTemplate>
+      </ItemsControl>
+
+      <TextBlock IsVisible="{Binding !HasMonitors}"
+                 Text="{loc:Tr missionControl.empty}"
+                 Foreground="{DynamicResource TextMuteBrush}"
+                 HorizontalAlignment="Center" VerticalAlignment="Center" />
+    </Panel>
+
+  </DockPanel>
+</UserControl>

src/ClaudeDo.Ui/Views/MissionControl/MissionControlView.axaml.cs

@@ -0,0 +1,8 @@
+using Avalonia.Controls;
+
+namespace ClaudeDo.Ui.Views.MissionControl;
+
+public partial class MissionControlView : UserControl
+{
+    public MissionControlView() => InitializeComponent();
+}

src/ClaudeDo.Ui/Views/MissionControl/MissionControlWindow.axaml

@@ -0,0 +1,13 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="using:ClaudeDo.Ui.ViewModels"
+        xmlns:mc="using:ClaudeDo.Ui.Views.MissionControl"
+        xmlns:loc="using:ClaudeDo.Ui.Localization"
+        x:Class="ClaudeDo.Ui.Views.MissionControl.MissionControlWindow"
+        x:DataType="vm:MissionControlViewModel"
+        Title="{loc:Tr missionControl.windowTitle}"
+        Width="1100" Height="760" MinWidth="640" MinHeight="420"
+        Background="{DynamicResource VoidBrush}"
+        Icon="avares://ClaudeDo.Ui/Assets/ClaudeTask.ico">
+  <mc:MissionControlView />
+</Window>

src/ClaudeDo.Ui/Views/MissionControl/MissionControlWindow.axaml.cs

@@ -0,0 +1,17 @@
+using Avalonia.Controls;
+
+namespace ClaudeDo.Ui.Views.MissionControl;
+
+public partial class MissionControlWindow : Window
+{
+    public MissionControlWindow() => InitializeComponent();
+
+    protected override void OnClosing(WindowClosingEventArgs e)
+    {
+        // Hide instead of destroying — Mission Control keeps tracking tasks in the
+        // background and re-shows on next open.
+        e.Cancel = true;
+        Hide();
+        base.OnClosing(e);
+    }
+}