feat(ui): add 'Add repos as lists' Help-menu entry point

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/ClaudeDo.Ui/Views/MainWindow.axaml

@@ -72,6 +72,7 @@
               <MenuItem Header="Worktrees…"
                         Command="{Binding OpenWorktreesOverviewGlobalCommand}"/>
               <MenuItem Header="About…" Command="{Binding OpenAboutCommand}"/>
+              <MenuItem Header="Add repos as lists…" Command="{Binding OpenRepoImportCommand}"/>
             </MenuItem>
           </Menu>
         </StackPanel>

src/ClaudeDo.Ui/Views/MainWindow.axaml.cs

@@ -62,6 +62,12 @@ public partial class MainWindow : Window
                 };
                 await dlg.ShowDialog(this);
             };
+            vm.ShowRepoImportModal = async (modal) =>
+            {
+                var dlg = new RepoImportModalView { DataContext = modal };
+                modal.CloseAction = () => dlg.Close();
+                await dlg.ShowDialog(this);
+            };
         }
     }