feat(ui): drive prime schedule rows from weekday toggles

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

src/ClaudeDo.Ui/ViewModels/Modals/Settings/PrimeClaudeTabViewModel.cs

@@ -30,8 +30,8 @@ public sealed partial class PrimeClaudeTabViewModel : ViewModelBase
     {
         foreach (var r in Rows)
         {
-            if (r.StartDate > r.EndDate)
-                return $"Schedule {r.TimeOfDay:hh\\:mm}: start date is after end date.";
+            if (r.DaysMask() == 0)
+                return $"Schedule {r.TimeOfDay:hh\\:mm}: select at least one day.";
             if (r.TimeOfDay < TimeSpan.Zero || r.TimeOfDay >= TimeSpan.FromDays(1))
                 return "Time must be between 00:00 and 23:59.";
         }
@@ -52,13 +52,10 @@ public sealed partial class PrimeClaudeTabViewModel : ViewModelBase
     [RelayCommand]
     private void AddSchedule()
     {
-        var today = DateOnly.FromDateTime(DateTime.Today);
         var dto = new PrimeScheduleDto(
             Id: Guid.NewGuid(),
-            StartDate: today,
-            EndDate: today.AddDays(30),
+            Days: 31, // Mon–Fri
             TimeOfDay: new TimeSpan(7, 0, 0),
-            WorkdaysOnly: true,
             Enabled: true,
             LastRunAt: null,
             PromptOverride: null);