fix(ui): remove duplicate list-settings context menu entry

List settings were reachable via three doors (header button, context
menu, double-click). Drop the context menu entry, matching the same
cut already made for the "Let Claude handle it" entry point.

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

@@ -123,9 +123,6 @@
                       DragDrop.Drop="OnListDrop">
                 <Border.ContextMenu>
                   <ContextMenu>
-                    <MenuItem Header="{loc:Tr lists.contextSettings}"
-                              Command="{Binding $parent[UserControl].((vm:ListsIslandViewModel)DataContext).OpenListSettingsCommand}"
-                              CommandParameter="{Binding}"/>
                     <MenuItem Header="{loc:Tr lists.contextWorktrees}"
                               Command="{Binding $parent[UserControl].((vm:ListsIslandViewModel)DataContext).OpenWorktreesOverviewCommand}"
                               CommandParameter="{Binding}"/>