feat(ui): make sidebar folder hierarchy readable

Lists default to the Text icon instead of the folder icon, rows align
across depths with a guide line per open folder, folder names are
semibold, folder counts only show while collapsed and zero counts hide.

src/ClaudeDo.Ui/ViewModels/Modals/ListSettingsModalViewModel.cs

@@ -111,7 +111,10 @@ public sealed partial class ListSettingsModalViewModel : ViewModelBase
 
     public ObservableCollection<string> CommitTypeOptions { get; } = new(CommitTypeRegistry.Types);
 
-    public const string DefaultIcon = "Folder";
+    public const string DefaultIcon = "Text";
+
+    /// <summary>Default icon for folders, kept apart from <see cref="DefaultIcon"/> so lists never look like folders.</summary>
+    public const string DefaultFolderIcon = "Folder";
 
     // Curated subset of the Icon.* geometry library in IslandStyles.axaml — window chrome and
     // pure stroke icons (PathIcon fills, so those render invisible) are deliberately left out.
@@ -171,7 +174,7 @@ public sealed partial class ListSettingsModalViewModel : ViewModelBase
         IsFolder = true;
         CanToggleFolder = false;
         Name = name;
-        Icon = IconOptions.Contains(icon) ? icon! : DefaultIcon;
+        Icon = IconOptions.Contains(icon) ? icon! : DefaultFolderIcon;
     }
 
     public async Task LoadAsync(
@@ -261,6 +264,13 @@ public sealed partial class ListSettingsModalViewModel : ViewModelBase
     // A manual list without a WorkingDir is untouched (empty is always valid) — this only fires
     // for the "picked a folder that turns out not to be a repo" case the audit found: it would
     // otherwise only surface as a Failed task the first time the worker tries to use it.
+    // The create-flow toggle swaps the untouched default so a new folder doesn't get the list icon.
+    partial void OnIsFolderChanged(bool value)
+    {
+        if (Icon == (value ? DefaultIcon : DefaultFolderIcon))
+            Icon = value ? DefaultFolderIcon : DefaultIcon;
+    }
+
     partial void OnWorkingDirChanged(string value)
     {
         if (string.IsNullOrWhiteSpace(value)) { WorkingDirWarning = ""; return; }