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.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"