feat(ui): highlight user chat messages + opt-in interrupt (stop) button

LogKindForegroundConverter drives the log message foreground via a local
binding (beats the dim local value), so user messages render in the accent
color instead of vanishing into the transcript. Adds a small stop (Icon.Stop)
button next to Send in both composers (SessionTerminalView + WorkConsole) wired
to InterruptInteractiveCommand → InterruptInteractiveSessionAsync. Adds
session.composer.interrupt (en/de).

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

@@ -267,7 +267,7 @@
                only while an interactive session is running for this task. -->
           <Grid DockPanel.Dock="Bottom"
                 IsVisible="{Binding Monitor.IsInteractiveLive}"
-                ColumnDefinitions="Auto,*,Auto"
+                ColumnDefinitions="Auto,*,Auto,Auto"
                 Margin="12,2,12,8">
             <TextBlock Grid.Column="0" Text="&#x276F;"
                        FontFamily="{StaticResource MonoFont}"
@@ -288,8 +288,14 @@
                 <KeyBinding Gesture="Enter" Command="{Binding Monitor.SubmitComposerCommand}" />
               </TextBox.KeyBindings>
             </TextBox>
-            <Button Grid.Column="2" Classes="prompt-action accent" Content="[Send]"
+            <Button Grid.Column="2" Classes="prompt-action"
                     VerticalAlignment="Center" Margin="12,0,0,0"
+                    Command="{Binding Monitor.InterruptInteractiveCommand}"
+                    ToolTip.Tip="{loc:Tr session.composer.interrupt}">
+              <PathIcon Data="{StaticResource Icon.Stop}" Width="10" Height="10"/>
+            </Button>
+            <Button Grid.Column="3" Classes="prompt-action accent" Content="[Send]"
+                    VerticalAlignment="Center" Margin="4,0,0,0"
                     Command="{Binding Monitor.SubmitComposerCommand}" />
           </Grid>
 
@@ -306,7 +312,7 @@
                                Text="{Binding TimestampFormatted}" />
                     <SelectableTextBlock Grid.Column="1"
                                          Text="{Binding Text}" Tag="{Binding ClassName}"
-                                         Foreground="{DynamicResource TextDimBrush}"
+                                         Foreground="{Binding Kind, Converter={StaticResource LogKindForeground}}"
                                          TextWrapping="Wrap" />
                   </Grid>
                 </DataTemplate>