feat(ui): interactive chat composer in the session terminal + work console

SessionTerminalView gains an opt-in composer (IsComposerVisible / ComposerText /
SubmitCommand / ComposerPlaceholder styled props); Mission Control binds it to the
monitor VM. Task detail's WorkConsole output tab gets a matching shell-prompt
composer bound through Monitor.*, shown only while an interactive session is live.
log-user lines render in the accent color. Adds session.composer.* (en/de).

src/ClaudeDo.Localization/locales/de.json

@@ -231,7 +231,12 @@
     "chipDone": "FERTIG",
     "chipFailed": "FEHLGESCHLAGEN",
     "reviewContinueTip": "Dieses Feedback senden und die Aufgabe erneut ausführen",
-    "reviewResetTip": "Alle Änderungen verwerfen und die Aufgabe auf Leerlauf zurücksetzen"
+    "reviewResetTip": "Alle Änderungen verwerfen und die Aufgabe auf Leerlauf zurücksetzen",
+    "composer": {
+      "placeholder": "Nachricht an die Sitzung…",
+      "send": "Senden",
+      "stop": "Sitzung beenden"
+    }
   },
   "missionControl": {
     "openInApp": "In App öffnen",

src/ClaudeDo.Localization/locales/en.json

@@ -231,7 +231,12 @@
     "chipDone": "DONE",
     "chipFailed": "FAILED",
     "reviewContinueTip": "Send this feedback and re-run the task",
-    "reviewResetTip": "Discard all changes and reset the task to Idle"
+    "reviewResetTip": "Discard all changes and reset the task to Idle",
+    "composer": {
+      "placeholder": "Message the session…",
+      "send": "Send",
+      "stop": "Stop session"
+    }
   },
   "missionControl": {
     "openInApp": "Open in app",

src/ClaudeDo.Ui/Design/IslandStyles.axaml

@@ -528,6 +528,10 @@
   <Style Selector="Border.terminal TextBlock[Tag=log-msg]">
     <Setter Property="Foreground" Value="{StaticResource TextDimBrush}" />
   </Style>
+  <!-- log-user: user's own messages in interactive sessions — accent color to stand out -->
+  <Style Selector="Border.terminal TextBlock[Tag=log-user]">
+    <Setter Property="Foreground" Value="{DynamicResource AccentBrush}" />
+  </Style>
 
   <!-- ============================================================ -->
   <!-- TERMINAL HEADER                                              -->

src/ClaudeDo.Ui/Views/Islands/Detail/WorkConsole.axaml

@@ -263,6 +263,36 @@
                     Command="{Binding RejectReviewCommand}" />
           </Grid>
 
+          <!-- Interactive composer — chat with a live in-app session; shell-prompt style,
+               only while an interactive session is running for this task. -->
+          <Grid DockPanel.Dock="Bottom"
+                IsVisible="{Binding Monitor.IsInteractiveLive}"
+                ColumnDefinitions="Auto,*,Auto"
+                Margin="12,2,12,8">
+            <TextBlock Grid.Column="0" Text="&#x276F;"
+                       FontFamily="{StaticResource MonoFont}"
+                       FontSize="{StaticResource FontSizeMono}"
+                       Foreground="{DynamicResource AccentBrush}"
+                       VerticalAlignment="Center" Margin="0,0,8,0" />
+            <TextBox Grid.Column="1"
+                     Classes="review-prompt"
+                     Text="{Binding Monitor.ComposerDraft, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
+                     AcceptsReturn="False"
+                     TextWrapping="Wrap"
+                     MaxHeight="160"
+                     PlaceholderText="{loc:Tr session.composer.placeholder}"
+                     VerticalContentAlignment="Center"
+                     FontFamily="{StaticResource MonoFont}"
+                     FontSize="{StaticResource FontSizeMono}">
+              <TextBox.KeyBindings>
+                <KeyBinding Gesture="Enter" Command="{Binding Monitor.SubmitComposerCommand}" />
+              </TextBox.KeyBindings>
+            </TextBox>
+            <Button Grid.Column="2" Classes="prompt-action accent" Content="[Send]"
+                    VerticalAlignment="Center" Margin="12,0,0,0"
+                    Command="{Binding Monitor.SubmitComposerCommand}" />
+          </Grid>
+
           <ScrollViewer Name="LogScroll"
                         VerticalScrollBarVisibility="Visible"
                         AllowAutoHide="False"

src/ClaudeDo.Ui/Views/Islands/SessionTerminalView.axaml

@@ -50,6 +50,29 @@
         </Border>
       </Grid>
 
+      <!-- ── Composer bar ── -->
+      <Border DockPanel.Dock="Bottom"
+              IsVisible="{Binding #Root.IsComposerVisible}"
+              Background="{DynamicResource Surface2Brush}"
+              BorderBrush="{DynamicResource LineBrush}"
+              BorderThickness="0,1,0,0"
+              Padding="6,5">
+        <Grid ColumnDefinitions="*,Auto">
+          <TextBox Grid.Column="0"
+                   Text="{Binding #Root.ComposerText, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
+                   PlaceholderText="{Binding #Root.ComposerPlaceholder}"
+                   AcceptsReturn="False">
+            <TextBox.KeyBindings>
+              <KeyBinding Gesture="Enter" Command="{Binding #Root.SubmitCommand}"/>
+            </TextBox.KeyBindings>
+          </TextBox>
+          <Button Grid.Column="1"
+                  Margin="6,0,0,0"
+                  Content="{loc:Tr session.composer.send}"
+                  Command="{Binding #Root.SubmitCommand}"/>
+        </Grid>
+      </Border>
+
       <!-- ── Log output ── -->
       <ScrollViewer Name="LogScroll"
                     VerticalScrollBarVisibility="Visible"

src/ClaudeDo.Ui/Views/Islands/SessionTerminalView.axaml.cs

@@ -1,7 +1,9 @@
 using System.Collections;
 using System.Collections.Specialized;
+using System.Windows.Input;
 using Avalonia;
 using Avalonia.Controls;
+using Avalonia.Data;
 
 namespace ClaudeDo.Ui.Views.Islands;
 
@@ -17,12 +19,24 @@ public partial class SessionTerminalView : UserControl
         AvaloniaProperty.Register<SessionTerminalView, bool>(nameof(IsDone));
     public static readonly StyledProperty<bool> IsFailedProperty =
         AvaloniaProperty.Register<SessionTerminalView, bool>(nameof(IsFailed));
+    public static readonly StyledProperty<bool> IsComposerVisibleProperty =
+        AvaloniaProperty.Register<SessionTerminalView, bool>(nameof(IsComposerVisible), defaultValue: false);
+    public static readonly StyledProperty<string?> ComposerTextProperty =
+        AvaloniaProperty.Register<SessionTerminalView, string?>(nameof(ComposerText), defaultBindingMode: BindingMode.TwoWay);
+    public static readonly StyledProperty<ICommand?> SubmitCommandProperty =
+        AvaloniaProperty.Register<SessionTerminalView, ICommand?>(nameof(SubmitCommand));
+    public static readonly StyledProperty<string?> ComposerPlaceholderProperty =
+        AvaloniaProperty.Register<SessionTerminalView, string?>(nameof(ComposerPlaceholder));
 
     public IEnumerable? Entries { get => GetValue(EntriesProperty); set => SetValue(EntriesProperty, value); }
     public string? Label { get => GetValue(LabelProperty); set => SetValue(LabelProperty, value); }
     public bool IsRunning { get => GetValue(IsRunningProperty); set => SetValue(IsRunningProperty, value); }
     public bool IsDone { get => GetValue(IsDoneProperty); set => SetValue(IsDoneProperty, value); }
     public bool IsFailed { get => GetValue(IsFailedProperty); set => SetValue(IsFailedProperty, value); }
+    public bool IsComposerVisible { get => GetValue(IsComposerVisibleProperty); set => SetValue(IsComposerVisibleProperty, value); }
+    public string? ComposerText { get => GetValue(ComposerTextProperty); set => SetValue(ComposerTextProperty, value); }
+    public ICommand? SubmitCommand { get => GetValue(SubmitCommandProperty); set => SetValue(SubmitCommandProperty, value); }
+    public string? ComposerPlaceholder { get => GetValue(ComposerPlaceholderProperty); set => SetValue(ComposerPlaceholderProperty, value); }
 
     private INotifyCollectionChanged? _subscribedCollection;
 

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

@@ -107,7 +107,11 @@
           Label="{Binding DisplayTitle}"
           IsRunning="{Binding IsRunning}"
           IsDone="{Binding IsDone}"
-          IsFailed="{Binding IsFailed}" />
+          IsFailed="{Binding IsFailed}"
+          IsComposerVisible="{Binding IsInteractiveLive}"
+          ComposerText="{Binding ComposerDraft, Mode=TwoWay}"
+          SubmitCommand="{Binding SubmitComposerCommand}"
+          ComposerPlaceholder="{loc:Tr session.composer.placeholder}" />
 
     </DockPanel>
   </Border>