fix(ui): remove duplicate Let-Claude entry point and icon collision

Context-menu "Let Claude handle it" on list rows duplicated the header
button; both routed to the same ListsIslandViewModel command via the
shell, so only the context menu entry (and its now-unused locale key)
is removed. The header button also shared Icon.Broom with Clear Day —
gave it Icon.AgentSuggested instead.

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

@@ -138,11 +138,6 @@
                               IsVisible="{Binding WorkingDir, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"
                               Command="{Binding $parent[UserControl].((vm:ListsIslandViewModel)DataContext).OpenInTerminalCommand}"
                               CommandParameter="{Binding}"/>
-                    <Separator IsVisible="{Binding WorkingDir, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
-                    <MenuItem Header="{loc:Tr lists.contextLetClaude}"
-                              IsVisible="{Binding WorkingDir, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"
-                              Command="{Binding $parent[UserControl].((vm:ListsIslandViewModel)DataContext).LetClaudeHandleListCommand}"
-                              CommandParameter="{Binding}"/>
                   </ContextMenu>
                 </Border.ContextMenu>
                 <Grid ColumnDefinitions="20,*,Auto">

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

@@ -35,7 +35,7 @@
           </Button>
           <Button Classes="icon-btn" IsVisible="{Binding IsLetClaudeVisible}"
                   Command="{Binding LetClaudeHandleCommand}" ToolTip.Tip="{loc:Tr tasks.letClaudeTip}">
-            <PathIcon Width="15" Height="15" Data="{StaticResource Icon.Broom}"/>
+            <PathIcon Width="15" Height="15" Data="{StaticResource Icon.AgentSuggested}"/>
           </Button>
           <Button Classes="icon-btn" IsVisible="{Binding IsMyDayList}"
                   Command="{Binding ClearDayCommand}" ToolTip.Tip="{loc:Tr tasks.clearDayTip}">