feat(ui): AskUser question banner in the detail island

The inline answer banner for a running task's AskUser question only existed
in Mission Control. Surface the same banner in the detail pane, bound to the
detail island's existing TaskMonitorViewModel (shared state — no new state,
no duplication) so a question can be answered without opening Mission
Control. Mirrors MC: live TaskQuestionAsked events for the selected task.

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

@@ -80,6 +80,37 @@
                                    Foreground="{DynamicResource TextDimBrush}"/>
             </StackPanel>
           </Border>
+
+          <!-- Question prompt (AskUser): answer the running task's question inline, mirroring
+               the Mission Control banner. State is shared via the same TaskMonitorViewModel. -->
+          <Border DockPanel.Dock="Top"
+                  IsVisible="{Binding Monitor.HasPendingQuestion}"
+                  Margin="0,0,0,10" Padding="12,8"
+                  Background="{DynamicResource AccentSoftBrush}"
+                  BorderBrush="{DynamicResource AccentBrush}"
+                  BorderThickness="1" CornerRadius="10">
+            <StackPanel Spacing="6">
+              <TextBlock Classes="meta"
+                         Text="{loc:Tr missionControl.question.title}"
+                         Foreground="{DynamicResource AccentBrush}" FontWeight="SemiBold"/>
+              <TextBlock Text="{Binding Monitor.PendingQuestion}" TextWrapping="Wrap"
+                         Foreground="{DynamicResource TextBrush}"/>
+              <Grid ColumnDefinitions="*,Auto" ColumnSpacing="6">
+                <TextBox Grid.Column="0"
+                         Text="{Binding Monitor.AnswerDraft, UpdateSourceTrigger=PropertyChanged}"
+                         PlaceholderText="{loc:Tr missionControl.question.placeholder}"
+                         AcceptsReturn="False">
+                  <TextBox.KeyBindings>
+                    <KeyBinding Gesture="Enter" Command="{Binding Monitor.SubmitAnswerCommand}"/>
+                  </TextBox.KeyBindings>
+                </TextBox>
+                <Button Grid.Column="1"
+                        Content="{loc:Tr missionControl.question.send}"
+                        Command="{Binding Monitor.SubmitAnswerCommand}"/>
+              </Grid>
+            </StackPanel>
+          </Border>
+
           <detail:WorkConsole/>
         </DockPanel>