feat(ui): split SettingsModalViewModel into per-tab VMs + add PrimeClaudeTabViewModel

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/ClaudeDo.Ui.Tests/ViewModels/PrimeClaudeTabViewModelTests.cs

@@ -0,0 +1,74 @@
+using ClaudeDo.Ui.Services;
+using ClaudeDo.Ui.ViewModels.Modals.Settings;
+
+namespace ClaudeDo.Ui.Tests.ViewModels;
+
+public class PrimeClaudeTabViewModelTests
+{
+    private sealed class FakeApi : IPrimeScheduleApi
+    {
+        public List<PrimeScheduleDto> Stored { get; } = new();
+        public List<PrimeScheduleDto> Upserts { get; } = new();
+        public List<Guid> Deletes { get; } = new();
+        public Task<List<PrimeScheduleDto>> ListAsync() => Task.FromResult(Stored.ToList());
+        public Task<PrimeScheduleDto?> UpsertAsync(PrimeScheduleDto dto)
+        {
+            Upserts.Add(dto);
+            return Task.FromResult<PrimeScheduleDto?>(dto);
+        }
+        public Task DeleteAsync(Guid id) { Deletes.Add(id); return Task.CompletedTask; }
+    }
+
+    [Fact]
+    public async Task Load_Populates_Rows()
+    {
+        var api = new FakeApi();
+        api.Stored.Add(new PrimeScheduleDto(
+            Guid.NewGuid(), new DateOnly(2026,5,1), new DateOnly(2026,5,31),
+            new TimeSpan(7,0,0), true, true, null, null));
+        var vm = new PrimeClaudeTabViewModel(api);
+        await vm.LoadAsync();
+        Assert.Single(vm.Rows);
+    }
+
+    [Fact]
+    public void AddSchedule_Appends_Row_With_Defaults()
+    {
+        var vm = new PrimeClaudeTabViewModel(new FakeApi());
+        vm.AddScheduleCommand.Execute(null);
+        Assert.Single(vm.Rows);
+        Assert.True(vm.Rows[0].Enabled);
+        Assert.True(vm.Rows[0].WorkdaysOnly);
+        Assert.Equal(new TimeSpan(7,0,0), vm.Rows[0].TimeOfDay);
+    }
+
+    [Fact]
+    public async Task Save_Diffs_New_And_Removed_Rows()
+    {
+        var api = new FakeApi();
+        var keptId = Guid.NewGuid();
+        var deletedId = Guid.NewGuid();
+        api.Stored.Add(new PrimeScheduleDto(keptId, new(2026,5,1), new(2026,5,31), new(7,0,0), true, true, null, null));
+        api.Stored.Add(new PrimeScheduleDto(deletedId, new(2026,5,1), new(2026,5,31), new(8,0,0), true, true, null, null));
+
+        var vm = new PrimeClaudeTabViewModel(api);
+        await vm.LoadAsync();
+        vm.RemoveScheduleCommand.Execute(vm.Rows.Single(r => r.Id == deletedId));
+        vm.AddScheduleCommand.Execute(null);
+
+        await vm.SaveAsync();
+
+        Assert.Contains(deletedId, api.Deletes);
+        Assert.Equal(2, api.Upserts.Count);
+    }
+
+    [Fact]
+    public void Validate_Reports_StartAfterEnd()
+    {
+        var vm = new PrimeClaudeTabViewModel(new FakeApi());
+        vm.AddScheduleCommand.Execute(null);
+        vm.Rows[0].StartDate = new DateOnly(2026, 6, 1);
+        vm.Rows[0].EndDate = new DateOnly(2026, 5, 1);
+        Assert.NotNull(vm.Validate());
+    }
+}