refactor: Datei-Scope-Serialisierung entfernen

ScopeGlobs auf Tasks und SerializeOnFileOverlap auf der Listen-Config waren
ungenutzt: der Scope wurde nie befuellt, also hat der Queue-Picker nie
serialisiert. ScopeOverlap, das Picker-Gate, die DTO-Felder, die UI-Option und
die Spalten fallen weg (Migration DropFileScopeSerialization).

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

@@ -41,9 +41,6 @@ public sealed partial class ListSettingsModalViewModel : ViewModelBase
     // Optional post-merge verification command (build/test), run in WorkingDir after a merge
     // lands; a non-zero exit keeps the task out of Done instead of silently reporting merged.
     [ObservableProperty] private string _verifyCommand = "";
-    // When on, the queue picker holds back a queued task whose declared scope globs overlap a
-    // running/awaiting-merge sibling in this list (ListConfigEntity.SerializeOnFileOverlap).
-    [ObservableProperty] private bool _serializeOnFileOverlap;
     // Dropdown hidden entirely when no ticket-system base URL is configured (Settings → Files tab).
     [ObservableProperty] private bool _ticketsAvailable;
     [ObservableProperty] private TicketProjectOption? _selectedTicketProject;
@@ -83,7 +80,6 @@ public sealed partial class ListSettingsModalViewModel : ViewModelBase
         await Agent.LoadForListAsync(listId, ct);
         var cfg = await _worker.GetListConfigAsync(listId);
         VerifyCommand = cfg?.VerifyCommand ?? "";
-        SerializeOnFileOverlap = cfg?.SerializeOnFileOverlap ?? false;
 
         var ticketSettings = TicketSettingsTabViewModel.FeatureEnabled
             ? await _worker.GetTicketSettingsAsync()
@@ -124,7 +120,6 @@ public sealed partial class ListSettingsModalViewModel : ViewModelBase
 
         await Agent.SaveAsync(
             string.IsNullOrWhiteSpace(VerifyCommand) ? null : VerifyCommand,
-            SerializeOnFileOverlap,
             ticketProjectId);
 
         CloseAction?.Invoke();