feat(claude-do): UI: Gate-Schwellen im Settings-Modal (General)

Macht die zwei Schwellen einstellbar. Setzt den Data-Subtask (Felder in `app_settings`) und den Hub-Subtask voraus.

**Zu bauen**
1. `AppSettingsDto` durchziehen: `WorkerHub` (`GetAppSettings` / `UpdateAppSettings`) und der UI-seitige Record in `WorkerClient.cs` bekommen `UsageGateFiveHourPct` und `UsageGateSevenDayPct`.
2. `GeneralSettingsTabViewModel`: zwei `[ObservableProperty]`-Felder, Validie

ClaudeDo-Task: 06068810-5b5c-4635-80dd-62eeba89fb8c

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

@@ -45,4 +45,30 @@ public class GeneralSettingsTabViewModelTests
 
         Assert.Equal(new List<string> { "a" }, vm.SelectedSessionSkillNames());
     }
+
+    [Theory]
+    [InlineData(-1, false)]
+    [InlineData(0, true)]
+    [InlineData(80, true)]
+    [InlineData(100, true)]
+    [InlineData(101, false)]
+    public void Validate_UsageGateFiveHourPct_bounds(int value, bool expectedValid)
+    {
+        var vm = new GeneralSettingsTabViewModel { UsageGateFiveHourPct = value };
+
+        Assert.Equal(expectedValid, vm.Validate() is null);
+    }
+
+    [Theory]
+    [InlineData(-1, false)]
+    [InlineData(0, true)]
+    [InlineData(80, true)]
+    [InlineData(100, true)]
+    [InlineData(101, false)]
+    public void Validate_UsageGateSevenDayPct_bounds(int value, bool expectedValid)
+    {
+        var vm = new GeneralSettingsTabViewModel { UsageGateSevenDayPct = value };
+
+        Assert.Equal(expectedValid, vm.Validate() is null);
+    }
 }

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

@@ -0,0 +1,76 @@
+using ClaudeDo.Localization;
+using ClaudeDo.Ui;
+using ClaudeDo.Ui.Services;
+using ClaudeDo.Ui.ViewModels.Modals;
+using ClaudeDo.Ui.ViewModels.Modals.Settings;
+using Xunit;
+
+namespace ClaudeDo.Ui.Tests.ViewModels;
+
+public class SettingsModalViewModelTests
+{
+    private sealed class FakeWorker : StubWorkerClient
+    {
+        public AppSettingsDto? AppToReturn;
+        public AppSettingsDto? Saved;
+        public override Task<AppSettingsDto?> GetAppSettingsAsync() => Task.FromResult(AppToReturn);
+        public override Task UpdateAppSettingsAsync(AppSettingsDto dto) { Saved = dto; return Task.CompletedTask; }
+    }
+
+    private sealed class FakePrimeApi : IPrimeScheduleApi
+    {
+        public Task<List<PrimeScheduleDto>> ListAsync() => Task.FromResult(new List<PrimeScheduleDto>());
+        public Task<PrimeScheduleDto?> UpsertAsync(PrimeScheduleDto dto) => Task.FromResult<PrimeScheduleDto?>(dto);
+        public Task DeleteAsync(Guid id) => Task.CompletedTask;
+    }
+
+    private static Localizer MakeLocalizer()
+    {
+        var dir = Path.Combine(Path.GetTempPath(), "loc_" + Guid.NewGuid().ToString("N"));
+        Directory.CreateDirectory(dir);
+        File.WriteAllText(Path.Combine(dir, "en.json"),
+            """{ "metadata": { "code": "en", "name": "English" }, "settings": { "save": "Save" } }""");
+        File.WriteAllText(Path.Combine(dir, "de.json"),
+            """{ "metadata": { "code": "de", "name": "Deutsch" }, "settings": { "save": "Speichern" } }""");
+        return new Localizer(LocaleStore.Load(dir), "en");
+    }
+
+    private static AppSettingsDto DtoWith(int fiveHourPct, int sevenDayPct) =>
+        new(DefaultClaudeInstructions: "", DefaultModel: "sonnet", DefaultMaxTurns: 30,
+            DefaultPermissionMode: "auto", MaxParallelExecutions: 1, WorktreeStrategy: "sibling",
+            CentralWorktreeRoot: null, WorktreeAutoCleanupEnabled: false, WorktreeAutoCleanupDays: 7,
+            ReportExcludedPaths: null, StandupWeekday: 3, DailyPrepMaxTasks: 5,
+            SessionSkills: null, ModelPresets: null,
+            UsageGateFiveHourPct: fiveHourPct, UsageGateSevenDayPct: sevenDayPct);
+
+    private static SettingsModalViewModel MakeVm(FakeWorker worker) =>
+        new(worker, new PrimeClaudeTabViewModel(new FakePrimeApi()), new OnlineLoginService(),
+            MakeLocalizer(), new AppSettings());
+
+    [Fact]
+    public async Task LoadAsync_fills_usage_gate_fields_from_dto()
+    {
+        var worker = new FakeWorker { AppToReturn = DtoWith(65, 95) };
+        var vm = MakeVm(worker);
+
+        await vm.LoadAsync();
+
+        Assert.Equal(65, vm.General.UsageGateFiveHourPct);
+        Assert.Equal(95, vm.General.UsageGateSevenDayPct);
+    }
+
+    [Fact]
+    public async Task Save_sends_usage_gate_fields_in_dto()
+    {
+        var worker = new FakeWorker();
+        var vm = MakeVm(worker);
+        vm.General.UsageGateFiveHourPct = 42;
+        vm.General.UsageGateSevenDayPct = 77;
+
+        await vm.SaveCommand.ExecuteAsync(null);
+
+        Assert.NotNull(worker.Saved);
+        Assert.Equal(42, worker.Saved!.UsageGateFiveHourPct);
+        Assert.Equal(77, worker.Saved.UsageGateSevenDayPct);
+    }
+}